库存物资管理系统

       库存物资管理系统要求有一个存放商品的仓库 ，每天都有商品的出库和入库。每个商品都有名称、生产厂家、型号、规格。我的数据库里商品的表如图。

包括id、产品名称、型号、规格。数据库里内容为，如图。

分别给他们的名称、型号、规格赋值。单据里的表属性为，如图。

表内的内容为，如图。

首先要实现商品的增删改查。首先要连接到数据库里面的表cangku。连接数据库的代码放在util包的DButil类里。代码如下。

package util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//连接数据库
public class DButil {
    public static String db_url = "jdbc:mysql://localhost:3306/kucunwuzi";
    public static String db_user = "root";
    public static String db_pass = "zxh521+.";
    public static Connection getConn () {
        Connection conn = null;
        
        try {
            Class.forName("com.mysql.jdbc.Driver");//加载驱动
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return conn;
    }
    public static void main(String[] args) {
         try
         {
         //第三步：获取连接类实例con，用con创建Statement对象类实例 sql_statement
         Connection con = getConn();
         Statement sql_statement = con.createStatement();
         String query = "select * from cangku";
         
         ResultSet result = sql_statement.executeQuery(query);
         
         //显示数据中network表中的内容：
         System.out.println("数据库kucunwuzi表cangku中的数据如下:");
         System.out.println("------------------------");
         System.out.println("name" + "     " +  "xinghao"+"       "+"guige"+"       ");
         System.out.println("------------------------");
         //对获得的查询结果进行处理，对Result类的对象进行操作
        
         while (result.next())
         {
         String name = result.getString("name");
         
         String xinghao = result.getString("xinghao");
         String guige = result.getString("guige");
         //取得数据库中的数据
         System.out.println(""+name + "          " + xinghao+"          "+guige+"           ");
         
         }
         
         } catch (SQLException ex) {
             System.err.println("SQLException: " + ex.getMessage());
             }
    }
    /**
     * 关闭连接
     * @param state
     * @param conn
     */
    public static void close (Statement state, Connection conn) {
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void close (ResultSet rs, Statement state, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
}

在连接数据库时首先要加载驱动。我在这里设置连上数据库之后查看数据库中的信息，这样可以更清晰的看出来数据库中的内容，并且可以知道成功连上了数据库。

在要实现数据库增删改查的时候，有一个实体类，我把它放在entity包里，这里是各个属性和set,get方法。代码如下。

package entity;
public class course {
private int id;
private String name;
private String xinghao;
private String guige;
public int getId() {
    return id;
}
public void setId(int id) {
    this.id=id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}

public String getXinghao() {
    return xinghao;
}
public void setXinghao(String xinghao) {
    this.xinghao = xinghao;
}
public String getGuige() {
    return guige;
}
public void setGuige(String guige) {
    this.guige = guige;
}
public course(){}
public course(int id,String name,String xinghao,String guige){
    this.id=id;
    this.name=name;
    this.xinghao=xinghao;
    this.guige=guige;
}
public course(String name,String xinghao,String guige){
    
    this.name=name;
    this.xinghao=xinghao;
    this.guige=guige;
}
}

在这个里面建了三个构造方法，一个是无参，一个是有参但是没有id,一个是有参有id。

要建一个类与数据库进制操作，我建立的是dao包，里面的类是coursedao，代码如下。

package dao;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import entity.course;
import util.DButil;
public class coursedao {
    public boolean add(course course) {//建立course类的对象
        String sql="insert into cangku(name,xinghao,guige)values('"+course.getName()+"','"+course.getXinghao()+"','"+course.getGuige()+"')";
                //添加语句，调用course类里面的方法，完成添加
    Connection conn=DButil.getConn();//建立桥
    Statement state=null;//建立车
    Boolean f=false;
    int a=0;

    try {
        state = conn.createStatement();//桥给车一个可以运输货物的功能
        
        a=state.executeUpdate(sql);//把运输货物的多少赋值给a
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        DButil.close(state, conn);//在运输结束后，毁掉桥和车
    }

    if (a > 0) {
        f = true;
    }
    return f;
    }
    public boolean name(String name) {
        Boolean flag=false;
        String sql="select from cangku where name='"+name+"'";
        Connection conn=DButil.getConn();//建立桥
        Statement state=null;//建立车
        ResultSet rs = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, state, conn);
        }
        return flag;
    }
    public course getCourseById(int id) {
        String sql = "select * from cangku where id ='" + id + "'";
        Connection conn = DButil.getConn();
        Statement state = null;
        ResultSet rs = null;
        course course = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                
                String name = rs.getString("name");
                
                String xinghao = rs.getString("xinghao");
                String guige = rs.getString("guige");
                course = new course(id,name,xinghao,guige);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, state, conn);
        }
        
        return course;
    }
    public course getCourseByName(String name) {
        String sql = "select * from cangku where name ='" + name + "'";
        Connection conn = DButil.getConn();
        Statement state = null;
        ResultSet rs = null;
        course course = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                int id = rs.getInt("id");
                
                String xinghao = rs.getString("xinghao");
                String guige = rs.getString("guige");
                course = new course(name,xinghao,guige);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, state, conn);
        }
        
        return course;
    }
    public boolean delete (int id) {
        boolean f = false;
        String sql = "delete from cangku where id='" + id + "'";
        Connection conn = DButil.getConn();
        Statement state = null;
        int a = 0;
        
        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil.close(state, conn);
        }
        
        if (a > 0) {
            f = true;
        }
        return f;
    }
    public boolean update(course course) {
        String sql = "update cangku set name='" + course.getName()  + "', xinghao='" + course.getXinghao()+"',guige='"+course.getGuige()
            + "' where id='" + course.getId() + "'";
        Connection conn = DButil.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;

        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil.close(state, conn);
        }
        
        if (a > 0) {
            f = true;
        }
        return f;
    }
    public List<course> search(String name,  String xinghao,String guige) {
        String sql = "select * from cangku where ";
        if (name != "") {
            sql += "name like '%" + name + "%'";
        }
        
        if (xinghao != "") {
            sql += "xinghao like '%" + xinghao + "%'";
        }
        if (guige != "") {
            sql += "guige like '%" + guige + "%'";
        }
        List<course> list = new ArrayList<>();
        Connection conn = DButil.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            course bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String name2 = rs.getString("name");
                
                String xinghao2 = rs.getString("xinghao");
                String guige2 = rs.getString("guige");
                bean = new course(id, name2, xinghao2,guige2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, state, conn);
        }
        
        return list;
    }
    public List<course> list() {
        String sql = "select * from cangku";
        List<course> list = new ArrayList<>();
        Connection conn = DButil.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            course bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String name2 = rs.getString("name");
                
                String xinghao2 = rs.getString("xinghao");
                String guige2 = rs.getString("guige");
                bean = new course(id,name2,xinghao2,guige2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, state, conn);
        }
        
        return list;
    }
}

在与数据库进行操作时，比如添加，要先写添加的sql语句，然后把数据库想象成一个岛，然后搭建一个桥，与岛相连，在造一个车。之后使用try,catch语句，在这个语句中给车一个可以载货物的功能，让它载上刚才的sql语句，通过桥到达岛上；其余的方法，比如删除，修改，通过名字查找，通过id查找都与这个类似。

有了与数据库进行联系的层，就需要有一个服务层，这一个实现dao层与servlet层之间的联系。代码如下。

package service;
import java.util.List;

import dao.coursedao;
import entity.course;
public class courseservice {
    coursedao cdao=new coursedao();//因为dao层就是与数据库的联系，所以其他层要要与数据可联系就要通过dao层
    public boolean add(course course) {
    Boolean f=false;
    if(!cdao.name(course.getName())) {
        cdao.add(course);
        f=true;
    }
    return f;
}
public void del(int id) {
    cdao.delete(id);
}

public void update(course course) {
    cdao.update(course);
}

public course getCourseById(int id) {
    return cdao.getCourseById(id);
}

public course getCourseByName(String name) {
    return cdao.getCourseByName(name);
}


public List<course> search(String name,  String xinghao,String guige) {
    return cdao.search(name, xinghao,guige);
}

public List<course> list() {
    return cdao.list();
}
}

这一层是service层。接下来就需要有一层可以实现与后台.jsp文件之间的联系。因为一个网页版的数据库的增删改查离不开前台和后台的合作。代码如下。

package servlet;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.coursedao;
import entity.course;
import entity.courselist;
import service.courseservice;

@WebServlet("/courseservlet")
public class courseservlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    courseservice service = new courseservice();
    public courseservlet() {
        super();
        
    }
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");//设置请求的字符编码格式
        String method = req.getParameter("method");//获得请求表单中的信息
        if ("add".equals(method)) {
            add(req, resp);
        } else if ("del".equals(method)) {
            del(req, resp);
        } else if ("update".equals(method)) {
            update(req, resp);
        } else if ("search".equals(method)) {
            search(req, resp);
        } else if ("getcoursebyid".equals(method)) {
            getCourseById(req, resp);
        } else if ("getcoursebyname".equals(method)) {
            getCourseByName(req, resp);
        } else if ("list".equals(method)) {
            list(req, resp);
        }
    }
    
    private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        List<course> courses = service.list();
        req.setAttribute("courses", courses);
        req.getRequestDispatcher("list.jsp").forward(req,resp);
    }
    private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        course course = service.getCourseByName(name);
        if(course == null) {
            req.setAttribute("message", "查无此物品！");
            req.getRequestDispatcher("del.jsp").forward(req,resp);
        } else {
            req.setAttribute("course", course);
            req.getRequestDispatcher("detail.jsp").forward(req,resp);
        }
    }
    private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        course course = service.getCourseById(id);
        req.setAttribute("course", course);
        req.getRequestDispatcher("detail2.jsp").forward(req,resp);
    }
    private void search(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        
        String xinghao = req.getParameter("xinghao");
        String guige = req.getParameter("guige");
        List<course> courses = service.search(name,  xinghao,guige);
        req.setAttribute("courses", courses);
        req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
        
    }
    private void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        String name = req.getParameter("name");
        
        String xinghao = req.getParameter("xinghao");
        String guige = req.getParameter("guige");
        course course = new course(id, name, xinghao,guige);
        
        service.update(course);
        req.setAttribute("message", "修改成功");
        req.getRequestDispatcher("courseservlet?method=list").forward(req,resp);
        
    }
    private void del(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        service.del(id);
        req.setAttribute("message", "删除成功！");
        req.getRequestDispatcher("del.jsp").forward(req,resp);
        
    }
    private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        
        String xinghao = req.getParameter("xinghao");
        String guige = req.getParameter("guige");
        course course = new course(name,xinghao,guige);
        
        //添加后消息显示
        if(service.add(course)) {
            req.setAttribute("message", "添加成功");//传递参数给jsp
            req.getRequestDispatcher("add.jsp").forward(req,resp);//与前台add.jsp文件取得联系
        } else {
            req.setAttribute("message", "物品名称重复，请重新录入");
            req.getRequestDispatcher("add.jsp").forward(req,resp);
        }
    }
}

这一层首先要设置请求的字符编码格式，然后获得请求表单中的信息。根据.jsp文件中写的来运行一下相关方法。比如添加方法。在这个方法中同样要先设置请求的字符编码格式，然后获得请求表单中的信息，然后把在.jsp中表格前的内容在分别赋给一个字符串类型的变量，然后运行service中的add方法，如果运行成功就会再次回到add.jsp文件的网页部分，并且显示添加成功。其他方法与此类似。

然后就是后台的.jsp文件，主页的index.jsp文件代码如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>
<style>
    .a{
        font-size: 26px;
        margin-top: 20px;
    }
</style>
</head>
<body>
<div align="center">
        <h1 style="color: red;">物品信息管理系统</h1>
        <div class="a">
            <a href="add.jsp">物品信息录入</a>
        </div>
        <div class="a">
            <a href="courseservlet?method=list">物品信息修改</a>
        </div>
        <div class="a">
            <a href="del.jsp">物品信息删除</a>
        </div>
        <div class="a">
            <a href="search.jsp">物品信息查询</a>
        </div>
        <div class="a">
            <a href="add2.jsp">物品入库信息</a>
        </div>
        <div class="a">
            <a href="del2.jsp">物品出库信息</a>
        </div>
        <div class="a">
            <a href="search2.jsp">物品单据信息查询</a>
        </div>
    </div>
</body>
</html>

在这个里面与其他的.jsp文件建立了联系，这样就可以实现网页之间的跳转。

之后add.jsp代码如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>//设置字体的格式
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
<%
         Object message = request.getAttribute("message");//接收从sevelet里面传来的参数
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: red;">物品信息录入</h1>
        <a href="index.jsp">返回主页</a>
        <form action="courseservlet?method=add" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name"/>
            </div>
            
            <div class="a">
                物品型号<input type="text" id="xinghao" name="xinghao"/>
            </div>
            <div class="a">
                物品规格<input type="text" id="guige" name="guige"/>
            </div>
            <div class="a">
                <button type="submit" class="b">保&nbsp;&nbsp;&nbsp;存</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");////
            
            var xinghao = document.getElementById("xinghao");
            var guige = document.getElementById("guige");
            //非空
            if(name.value == '') {
                alert('物品名称为空');
                name.focus();////
                return false;
            }
            
            if(xinghao.value == '') {
                alert('物品型号为空');
                classroom.focus();
                return false;
            }
            if(guige.value == '') {
                alert('物品规格为空');
                classroom.focus();
                return false;
            }
            
            
        }
    </script>
</body>
</html>

在添加的时候要进行/method的判断，来判断要运行courseservlet中的哪个方法。之后要设置文本框的格式。最后要进行判断，输入的内容不能为空。

删除的代码如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: red;">物品信息删除</h1>
        <a href="index.jsp">返回主页</a>
        
        <form action="courseservlet?method=getcoursebyname" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                <button type="submit" class="b">查找</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            
            //非空
            if(name.value == '') {
                alert('物品名称为空');
                name.focus();
                return false;
            }
        }
    </script>
</body>
</html>

首先根据名字进行查找。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
    
        <h1 style="color: red;">物品信息删除</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>物品名称</td>
                <td>${course.name}</td>
            </tr>
            
            <tr>
                <td>物品型号</td>
                <td>${course.xinghao}</td>
            </tr>
            <tr>
                <td>物品规格</td>
                <td>${course.guige}</td>
            </tr>
        </table>
        <div class="a">
            <a onclick="return check()" href="courseservlet?method=del&id=${course.id}">删除</a>
        </div>
    </div>
    <script type="text/javascript">
        function check() {
            if (confirm("真的要删除吗？")){
                return true;
            }else{
                return false;
            }
        }
    </script>
</body>
</html>

然后查找出内容，在点了删除键之后要确定是否真的删除。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: red;">物品信息列表</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>id</td>
                <td>物品名称</td>
                
                <td>物品型号</td>
                <td>物品规格</td>
                <td align="center" colspan="2">操作</td>
            </tr>
            <c:forEach items="${courses}" var="item">
                <tr>
                    <td>${item.id}</td>
                    <td>${item.name}</td>
                    
                    <td>${item.xinghao}</td>
                    <td>${item.guige}</td>
                    <td><a href="courseservlet?method=getcoursebyid&id=${item.id}">修改</a></td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>

这个是进行修改的页面，首先把全部的信息列出来，可以选择性的对哪一个信息进行修改。点击修改之后。到达另一个修改界面。代码如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: red;">物品信息修改</h1>
        <a href="index.jsp">返回主页</a>
        <form action="courseservlet?method=update" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name" value="${course.name}"/>
            </div>
            
            <div class="a">
                物品型号<input type="text" id="xinghao" name="xinghao" value="${course.xinghao}"/>
            </div>
            <div class="a">
                物品规格<input type="text" id="guige" name="guige" value="${course.guige}"/>
            </div>
            <input type="hidden" id="id" name="id" value="${course.id}"/>
            <div class="a">
                <button type="submit" class="b">修&nbsp;&nbsp;&nbsp;改</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            
            var xinghao = document.getElementById("xinghao");
            var guige = document.getElementById("guige");
            //非空
            if(name.value == '') {
                alert('物品名称为空');
                name.focus();
                return false;
            }
            
            if(xinghao.value == '') {
                alert('物品型号为空');
                classroom.focus();
                return false;
            }
            if(guige.value == '') {
                alert('物品规格为空');
                classroom.focus();
                return false;
            }
            
        }
    </script>
</body>
</html>

在进行修改的时候，同样要进行判断，每个信息不能为空。

然后是查询，使用迷糊查询，代码如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: red;">物品信息查询</h1>
        <a href="index.jsp">返回主页</a>
        <form action="courseservlet?method=search" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name"/>
            </div>
            
            <div class="a">
                物品型号<input type="text" id="xinghao" name="xinghao" />
            </div>
            <div class="a">
                物品规格<input type="text" id="guige" name="guige" />
            </div>
            <div class="a">
                <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;询</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            
            var xinghao = document.getElementById("xinghao");
            var guige = document.getElementById("guige");
            //非空
            if(name.value == '' &&  xinghao.value == ''&&guige.value=='') {
                alert('请填写一个条件');
                return false;
            }
        }
    </script>
</body>
</html>

在查询时输入一个条件，就会出现整个信息。出现整个信息的代码如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: red;">物品信息列表</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>id</td>
                <td>物品名称</td>
                
                <td>物品型号</td>
                <td>物品规格</td>
            </tr>
            <!-- forEach遍历出adminBeans -->
            <c:forEach items="${courses}" var="item" varStatus="status">
                <tr>
                    <td>${item.id}</td>
                    <td><a>${item.name}</a></td>
                    
                    <td>${item.xinghao}</td>
                    <td>${item.guige}</td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>
</html>

在这个题目中要求使用单据，用单据记录商品出库入库的信息，所以又建立了一个表danju，首先也是连接整个表。内容如下。

package util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//连接数据库
public class DButil2 {
    public static String db_url = "jdbc:mysql://localhost:3306/kucunwuzi";
    public static String db_user = "root";
    public static String db_pass = "zxh521+.";
    public static Connection getConn () {
        Connection conn = null;
        
        try {
            Class.forName("com.mysql.jdbc.Driver");//加载驱动
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return conn;
    }
    public static void main(String[] args) {
         try
         {
         //第三步：获取连接类实例con，用con创建Statement对象类实例 sql_statement
         Connection con = getConn();
         Statement sql_statement = con.createStatement();
         String query = "select * from danju";
         
         ResultSet result = sql_statement.executeQuery(query);
         
         //显示数据中network表中的内容：
         System.out.println("数据库kucunwuzi表danju中的数据如下:");
         System.out.println("------------------------");
         System.out.println("name" + "     " +  "xinghao"+"       "+"guige"+"       "+"num"+"       "+"date"+"       "+"time"+"        "+"danwei"+"        "+"pname"+"         ");
         System.out.println("------------------------");
         //对获得的查询结果进行处理，对Result类的对象进行操作
        
         while (result.next())
         {
         String name = result.getString("name");
         
         String xinghao = result.getString("xinghao");
         String guige = result.getString("guige");
         String num = result.getString("num");
         String date = result.getString("date");
         String time = result.getString("time");
         String danwei = result.getString("danwei");
         String pname = result.getString("pname");
         
         //取得数据库中的数据
         System.out.println(""+name + "          " + xinghao+"          "+guige+"           "+num+"         "+date+"        "+time+"         "+danwei+"        "+pname+"        ");
         
         }
         
         } catch (SQLException ex) {
             System.err.println("SQLException: " + ex.getMessage());
             }
    }
    /**
     * 关闭连接
     * @param state
     * @param conn
     */
    public static void close (Statement state, Connection conn) {
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static void close (ResultSet rs, Statement state, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
}

然后是实体类，代码如下。

package entity;

import java.util.List;

public class courselist {
    private int id;
    private String name;
    private String xinghao;
    private String guige;
    private int num;
    private String date;
    
    private String danwei;
    private String pname;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getXinghao() {
        return xinghao;
    }
    public void setXinghao(String xinghao) {
        this.xinghao = xinghao;
    }
    public String getGuige() {
        return guige;
    }
    public void setGuige(String guige) {
        this.guige = guige;
    }
    public int getNum() {
        return num;
    }
    public void setNum(int num) {
        this.num = num;
    }
    public String getDate() {
        return date;
    }
    public void setDate(String date) {
        this.date = date;
    }
    
    public String getDanwei() {
        return danwei;
    }
    public void setDanwei(String danwei) {
        this.danwei = danwei;
    }
    public String getPname() {
        return pname;
    }
    public void setPname(String pname) {
        this.pname = pname;
    }
    public courselist() {}
    public courselist(int id,String name,String xinghao,String guige,int num,String date,String danwei,String pname) {
        this.id=id;
        this.name=name;
        this.xinghao=xinghao;
        this.guige=guige;
        this.num=num;
        this.date=date;
        
        this.danwei=danwei;
        this.pname=pname;
    }
    public courselist(String name,String xinghao,String guige,int num,String date,String danwei,String pname) {
        this.name=name;
        this.xinghao=xinghao;
        this.guige=guige;
        this.num=num;
        this.date=date;
        
        this.danwei=danwei;
        this.pname=pname;
    }
}

然后是dao层，代码如下。

package dao;
import java.sql.*;

import java.util.List;

import entity.course;
import entity.courselist;
import util.DButil;
import util.DButil2;

import java.util.ArrayList;

public class coursedao2 {
    public boolean add2(courselist courselist) {//建立course类的对象
        String sql="insert into danju(name,xinghao,guige,num,date,danwei,pname)values('"+courselist.getName()+"','"+courselist.getXinghao()+"','"+courselist.getGuige()+"','"+courselist.getNum()+"','"+courselist.getDate()+"','"+courselist.getDanwei()+"','"+courselist.getPname()+"')";
                //添加语句，调用course类里面的方法，完成添加
        System.out.println(sql);
    Connection conn=DButil2.getConn();//建立桥
    Statement state=null;//建立车
    Boolean f=false;
    int a=0;

    try {
        state = conn.createStatement();//桥给车一个可以运输货物的功能
        
        a=state.executeUpdate(sql);//把运输货物的多少赋值给a
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        DButil2.close(state, conn);//在运输结束后，毁掉桥和车
    }

    if (a > 0) {
        f = true;
    }
    return f;
    }
    public boolean name2(String name) {
        Boolean flag=false;
        String sql="select from danju where name='"+name+"'";
        Connection conn=DButil2.getConn();//建立桥
        Statement state=null;//建立车
        ResultSet rs = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil2.close(rs, state, conn);
        }
        return flag;
    }
    public courselist getCourseById2(int id) {
        String sql = "select * from danju where id ='" + id + "'";
        Connection conn = DButil2.getConn();
        Statement state = null;
        ResultSet rs = null;
        courselist courselist = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                
                String name = rs.getString("name");
                
                String xinghao = rs.getString("xinghao");
                String guige = rs.getString("guige");
                int num = rs.getInt("num");
                String date = rs.getString("date");
                
                String danwei = rs.getString("danwei");
                String pname = rs.getString("pname");
                courselist = new courselist(id,name,xinghao,guige,num,date,danwei,pname);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil.close(rs, state, conn);
        }
        
        return courselist;
    }
    public courselist getCourseByName2(String name) {
        String sql = "select * from danju where name ='" + name + "'";
        Connection conn = DButil2.getConn();
        Statement state = null;
        ResultSet rs = null;
        courselist courselist = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                int id = rs.getInt("id");
                
                String xinghao = rs.getString("xinghao");
                String guige = rs.getString("guige");
                int num = rs.getInt("num");
                String date = rs.getString("date");
                
                String danwei = rs.getString("danwei");
                String pname = rs.getString("pname");
                courselist = new courselist(id,name,xinghao,guige,num,date,danwei,pname);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DButil2.close(rs, state, conn);
        }
        
        return courselist;
    }
    public boolean delete2 (int id) {
        boolean f = false;
        String sql = "delete from danju where id='" + id + "'";
        Connection conn = DButil2.getConn();
        Statement state = null;
        int a = 0;
        
        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil2.close(state, conn);
        }
        
        if (a > 0) {
            f = true;
        }
        return f;
    }
    public List<courselist> search2(String name) {
        String sql = "select * from danju where ";
        if (name != "") {
            sql += "name like '%" + name + "%'";
        }
        List<courselist> list = new ArrayList<>();
        Connection conn = DButil2.getConn();
        Statement state = null;
        ResultSet rs = null;
System.out.println(sql);
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            courselist bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String name2 = rs.getString("name");
                System.out.println(name2);
                String xinghao2 = rs.getString("xinghao");
                String guige2 = rs.getString("guige");
                int num2 = rs.getInt("num");
                String date2 = rs.getString("date");
                
                String danwei2 = rs.getString("danwei");
                String pname2 = rs.getString("pname");
                bean = new courselist(id, name2, xinghao2,guige2,num2,date2,danwei2,pname2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil2.close(rs, state, conn);
        }
        
        return list;
    }
    public List<courselist> list2() {
        String sql = "select * from danju";
        List<courselist> list = new ArrayList<>();
        Connection conn = DButil2.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            courselist bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String name2 = rs.getString("name");
                
                String xinghao2 = rs.getString("xinghao");
                String guige2 = rs.getString("guige");
                int num2 = rs.getInt("nume");
                String date2 = rs.getString("date");
                
                String danwei2 = rs.getString("danwei");
                String pname2 = rs.getString("pname");
                bean = new courselist(id, name2, xinghao2,guige2,num2,date2,danwei2,pname2);
                
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DButil2.close(rs, state, conn);
        }
        
        return list;
    }
}

然后是service层，代码如下。

package service;

import java.util.List;

import dao.coursedao;
import dao.coursedao2;
import entity.course;
import entity.courselist;

public class courseservice2 {
    coursedao2 cdao2=new coursedao2();
    public boolean add2(courselist courselist) {
        Boolean f=false;
        if(!cdao2.name2(courselist.getName())) {
            cdao2.add2(courselist);
            f=true;
        }
        return f;
    }
    public void del2(int id) {
        cdao2.delete2(id);
    }
    public courselist getCourseById2(int id) {
        return cdao2.getCourseById2(id);
    }

    public courselist getCourseByName2(String name) {
        return cdao2.getCourseByName2(name);
    }


    public List<courselist> search2(String name) {
        return cdao2.search2(name);
    }

    public List<courselist> list2() {
        return cdao2.list2();
    }
}

然后是servlet层，代码如下。

package servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.coursedao;
import dao.coursedao2;
import entity.course;
import entity.courselist;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.coursedao2;

import entity.courselist;
import service.courseservice;
import service.courseservice2;

@WebServlet("/courseservlet2")
public class courseservlet2 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    courseservice2 service2 = new courseservice2();
    public courseservlet2() {
        super();
        // TODO Auto-generated constructor stub
    }
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");//设置请求的字符编码格式
        String method = req.getParameter("method");//获得请求表单中的信息
        if ("add".equals(method)) {
            add2(req, resp);
        } else if ("del".equals(method)) {
            del2(req, resp);
        } else if ("search".equals(method)) {
            search2(req, resp);
        } else if ("getcoursebyid".equals(method)) {
            getCourseById2(req, resp);
        } else if ("getcoursebyname".equals(method)) {
            getCourseByName2(req, resp);
        } else if ("list".equals(method)) {
            list2(req, resp);
        }
    }
    private void list2(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        
        List<courselist> courses = service2.list2();
        req.setAttribute("courses", courses);
        req.getRequestDispatcher("list2.jsp").forward(req,resp);
    }
    private void getCourseByName2(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        courselist courselist = service2.getCourseByName2(name);
        if(courselist == null) {
            req.setAttribute("message", "查无此物品！");
            req.getRequestDispatcher("del2.jsp").forward(req,resp);
        } else {
            req.setAttribute("courselist", courselist);
            req.getRequestDispatcher("detail1.jsp").forward(req,resp);
        }
    }
    private void getCourseById2(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        courselist courselist = service2.getCourseById2(id);
        req.setAttribute("courselist", courselist);
        req.getRequestDispatcher("detail2.jsp").forward(req,resp);
    }
    private void search2(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        //String xinghao = req.getParameter("xinghao");
        //String guige = req.getParameter("guige");
        //int num = Integer.parseInt(req.getParameter("num"));
        //String date = req.getParameter("date");
        
        //String danwei = req.getParameter("danwei");
        //String pname = req.getParameter("pname");
        List<courselist> courses2 = service2.search2(name);
        //req.setAttribute("courses2", courses2);
        req.setAttribute("courses2", courses2);
        req.getRequestDispatcher("searchlist2.jsp").forward(req,resp);
        
    }
    private void del2(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        service2.del2(id);
        req.setAttribute("message", "出库成功！");
        req.getRequestDispatcher("del2.jsp").forward(req,resp);
        
    }
    private void add2(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        
        String xinghao = req.getParameter("xinghao");
        String guige = req.getParameter("guige");
        int num = Integer.parseInt(req.getParameter("num"));
        String date = req.getParameter("date");
        
        String danwei = req.getParameter("danwei");
        String pname = req.getParameter("pname");
        courselist courselist = new courselist(name,xinghao,guige,num,date,danwei,pname);
        
        //添加后消息显示
        if(service2.add2(courselist)) {
            req.setAttribute("message", "添加成功");//传递参数给jsp
            req.getRequestDispatcher("add2.jsp").forward(req,resp);//与前台add.jsp文件取得联系
        } else {
            req.setAttribute("message", "物品名称重复，请重新录入");
            req.getRequestDispatcher("add.2jsp").forward(req,resp);
        }
    }
}

    

以上是后台的文件代码，之后是后台.jsp文件代码。入库的单据代码为：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>//设置字体的格式
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
<%
         Object message = request.getAttribute("message");//接收从sevelet里面传来的参数
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: red;">物品入库信息录入</h1>
        <a href="index.jsp">返回主页</a>
        <form action="courseservlet2?method=add" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name"/>
            </div>
            
            <div class="a">
                物品型号<input type="text" id="xinghao" name="xinghao"/>
            </div>
            <div class="a">
                物品规格<input type="text" id="guige" name="guige"/>
            </div>
            <div class="a">
                物品入库数量<input type="text" id="num" name="num"/>
            </div>
            <div class="a">
                物品入库日期<input type="text" id="date" name="date"/>
            </div>
            
            <div class="a">
                物品入库单位<input type="text" id="danwei" name="danwei"/>
            </div>
            <div class="a">
                物品入库送货人<input type="text" id="pname" name="pname"/>
            </div>
            <div class="a">
                <button type="submit" class="b">保&nbsp;&nbsp;&nbsp;存</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");////
            
            var xinghao = document.getElementById("xinghao");
            var guige = document.getElementById("guige");
            var num = document.getElementById("num");
            var date = document.getElementById("date");
            
            var danwei = document.getElementById("danwei");
            var pname = document.getElementById("pname");
            //非空
            if(name.value == '') {
                alert('物品名称为空');
                name.focus();////
                return false;
            }
            
            if(xinghao.value == '') {
                alert('物品型号为空');
                classroom.focus();
                return false;
            }
            if(guige.value == '') {
                alert('物品规格为空');
                classroom.focus();
                return false;
            }
            if(num.value == '') {
                alert('物品数量为空');
                classroom.focus();
                return false;
            }
            if(date.value == '') {
                alert('物品入库日期为空');
                classroom.focus();
                return false;
            }
            
            if(danwei.value == '') {
                alert('物品入库单位为空');
                classroom.focus();
                return false;
            }
            if(pname.value == '') {
                alert('物品送货人为空');
                classroom.focus();
                return false;
            }
            
        }
    </script>
</body>
</html>

出库的单据代码为：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <div align="center">
        <h1 style="color: red;">物品出库信息</h1>
        <a href="index.jsp">返回主页</a>
        
        <form action="courseservlet2?method=getcoursebyname" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                <button type="submit" class="b">查找</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            
            //非空
            if(name.value == '') {
                alert('物品名称为空');
                name.focus();
                return false;
            }
        }
    </script>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
    
        <h1 style="color: red;">物品出库信息</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>物品名称</td>
                <td>${courselist.name}</td>
            </tr>
            
            <tr>
                <td>物品型号</td>
                <td>${courselist.xinghao}</td>
            </tr>
            <tr>
                <td>物品规格</td>
                <td>${courselist.guige}</td>
            </tr>
            <tr>
                <td>物品数量</td>
                <td>${courselist.num}</td>
            </tr>
            <tr>
                <td>物品出库日期</td>
                <td>${courselist.date}</td>
            </tr>
            <tr>
                <td>物品出库时间</td>
                <td>${courselist.date}</td>
            </tr>
            
            <tr>
                <td>物品出库送货人</td>
                <td>${courselist.danwei}</td>
            </tr>
        </table>
        <div class="a">
            <a onclick="return check()" href="courseservlet2?method=del&id=${courselist.id}">出库</a>
        </div>
    </div>
    <script type="text/javascript">
        function check() {
            if (confirm("真的要出库吗？")){
                return true;
            }else{
                return false;
            }
        }
    </script>
</body>
</html>

对单据信息查询的单据代码为：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: red;">物品出入库信息查询</h1>
        <a href="index.jsp">返回主页</a>
        <form action="courseservlet2?method=search" method="post" onsubmit="return check()">
            <div class="a">
                物品名称<input type="text" id="name" name="name"/>
            </div>
            
            
            <div class="a">
                <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;询</button>
            </div>
            
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            
            var xinghao = document.getElementById("xinghao");
            var guige = document.getElementById("guige");
            var num = document.getElementById("nume");
            var date = document.getElementById("date");
            
            var danwei = document.getElementById("danwei");
            var pname = document.getElementById("pname");
            //非空
            if(name.value == '' &&  xinghao.value == ''&&guige.value==''&&num.value==''&&date.value==''&&danwei.value==''&&pname.value=='') {
                alert('请填写一个条件');
                return false;
            }
        }
    </script>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: red;">物品出入库信息列表</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>id</td>
                <td>物品名称</td>
                
                <td>物品型号</td>
                <td>物品规格</td>
                <td>物品数目</td>
                <td>日期</td>
                
                <td>单位</td>
                <td>送货人</td>
            </tr>
            <!-- forEach遍历出adminBeans -->
            <c:forEach items="${courses2}" var="item" varStatus="status">
                <tr>
                    <td>${item.id}</td>
                    <td>${item.name}</td>
                    
                    <td>${item.xinghao}</td>
                    <td>${item.guige}</td>
                    <td>${item.num}</td>
                    <td>${item.date}</td>
                    
                    <td>${item.danwei}</td>
                    <td>${item.pname}</td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>
</html>

以上就所有的代码内容。之后是我的商品增删改查的截图。