12.13java过关测试

库存物资管理系统：

1.首先建两个数据表，一个pass用于商品的增删改查，一个passd记录商品的出库与入库信息；

2.建两个实体类，用来传递商品与单据的信息

3.在添加与删除时，填写入库或者出库单据，入库时增加商品，出库时删除商品。course类写商品的增删改查，另一个dao类只写单据的添加，自后将两张表连接起来

package common;

public class Pass {
private int id;
private String name;  /*名称*/
private String vender;/*生产厂家*/
private String xnumber;/*型号*/
private String standard;/*规格*/
public int getId() {
    return id;
}
public void setId() {
    this.id=id;
}
public String getName() {
    return name;
}
public void setName() {
    this.name=name;
}
public String getVender() {
    return vender;
}
public void setVender() {
    this.vender=vender;
}
public String getXnumber() {
    return xnumber;
}
public void setXnumber() {
    this.xnumber=xnumber;
}
public String getStandard() {
    return standard;
}
public void setStandard() {
    this.standard=standard;
}
public Pass() {}

public Pass(int id, String name, String vender, String xnumber,String standard) {
    this.id = id;
    this.name = name;
    this.vender=vender;    
    this.xnumber = xnumber;
    this.standard = standard;
}

public Pass( String name, String vender, String xnumber,String standard) {    
    this.name = name;
    this.vender=vender;    
    this.xnumber = xnumber;
    this.standard = standard;
}
}

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 common.Pass;
import helper.DeHelper;
public class PassDao {
    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(Pass pass) {
        String sql = "insert into pass(name, vender, xnumber,standard) values('" + pass.getName() + "','" + pass.getVender() + "','" + pass.getXnumber() + "','"+pass.getStandard()+"')";
        Connection conn = DeHelper.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;
        
        try {
            state = conn.createStatement();
            state.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(state, conn);
        }
        
        if (a > 0) {
            f = true;
        }
        return f;
    }
    /**
     * 删除
     * 
     * @param id
     * @return
     */
    public boolean delete (int id) {
        boolean f = false;
        String sql = "delete from pass where id='" + id + "'";
        Connection conn = DeHelper.getConn();
        Statement state = null;
        int a = 0;
        
        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(state, conn);
        }
        
        if (a > 0) {
            f = true;
        }
        return f;
    }
    /**
     * 修改
     * @param name
     * @param pass
     */
    public boolean update(Pass pass) {
        String sql = "update pass set name='" + pass.getName() + "', vender='" + pass.getVender() + "', xnumber='" + pass.getXnumber()+"',standard='"+pass.getStandard()
            + "' where id='" + pass.getId() + "'";
        Connection conn = DeHelper.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;

        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(state, conn);
        }
        
        if (a > 0) {
            f = true;
        }
        return f;
    }
    /**
     * 验证名称是否唯一
     * true --- 不唯一
     * @param name
     * @return
     */
    public boolean name(String name) {
        boolean flag = false;
        String sql = "select name from course where name = '" + name + "'";
        Connection conn = DeHelper.getConn();
        Statement state = null;
        ResultSet rs = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(rs, state, conn);
        }
        return flag;
    }
    
    /**
     * 通过ID得到类
     * @param id
     * @return
     */
    public Pass getPassById(int id) {
        String sql = "select * from pass where id ='" + id + "'";
        Connection conn = DeHelper.getConn();
        Statement state = null;
        ResultSet rs = null;
        Pass pass = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                String name = rs.getString("name");
                String vender = rs.getString("vender");
                String xnumber = rs.getString("xnumber");
                String standard=rs.getString("standard");
                pass = new Pass(id, name, vender, xnumber,standard);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(rs, state, conn);
        }
        
        return pass;
    }
    
    /**
     * 通过name得到Pass
     * @param name
     * @return
     */
    public Pass getPassByName(String name) {
        String sql = "select * from pass where name ='" + name + "'";
        Connection conn = DeHelper.getConn();
        Statement state = null;
        ResultSet rs = null;
        Pass pass = null;
        
        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            while (rs.next()) {
                int id = rs.getInt("id");
                String vender = rs.getString("vender");
                String xnumber = rs.getString("xnumber");
                String standard=rs.getString("standard");
                pass = new Pass(id, name,vender, xnumber, standard);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(rs, state, conn);
        }
        
        return pass;
    }

    /**
     * 查找
     * @param name
     * @param teacher
     * @param classroom
     * @return
     */
    public List<Pass> search(String name, String vender, String xnumber,String standard) {
        String sql = "select * from pass where ";
        if (name != "") {
            sql += "name like '%" + name + "%'";
        }
        if (vender != "") {
            sql += "vender like '%" + vender + "%'";
        }
        if (xnumber != "") {
            sql += "xnumber like '%" + xnumber + "%'";
        }
        if (standard != "") {
            sql += "standard like '%" + standard + "%'";
        }
        List<Pass> list = new ArrayList<>();
        Connection conn = DeHelper.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            Pass bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String name2 = rs.getString("name");
                String vender2 = rs.getString("vender");
                String xnumber2 = rs.getString("xnumber");
                String standard2=rs.getString("standard");
                bean = new Pass(id, name2, vender2, xnumber2 ,standard2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(rs, state, conn);
        }
        
        return list;
    }
    
    /**
     * 全部数据
     * @param name
     * @param teacher
     * @param classroom
     * @return
     */
    public List<Pass> list() {
        String sql = "select * from pass";
        List<Pass> list = new ArrayList<>();
        Connection conn = DeHelper.getConn();
        Statement state = null;
        ResultSet rs = null;

        try {
            state = conn.createStatement();
            rs = state.executeQuery(sql);
            Pass bean = null;
            while (rs.next()) {
                int id = rs.getInt("id");
                String name2 = rs.getString("name");
                String vender2 = rs.getString("vender");
                String xnumber2 = rs.getString("xnumber");
                String standard2=rs.getString("standard");
                bean = new Pass(id, name2, vender2, xnumber2 ,standard2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DeHelper.close(rs, state, conn);
        }
        
        return list;
    }
}

package helper;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 数据库连接工具
 * @author Hu
 *
 */
public class DeHelper {
    
    public static String db_url = "jdbc:mysql://localhost:3306/MySQL?useSSL=false";
    public static String db_user = "root";
    public static String db_pass = "995893";
    
    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;
    }
    
    /**
     * 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();
            }
        }
    }

}

package service;

import dao.PassDao;

import java.util.List;

import common.Pass;

/**
 * PassService
 * 服务层
 * @author Hu
 *
 */
public class PassService {

    PassDao cDao = new PassDao();
    
    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(Pass pass) {
        boolean f = false;
        if(!cDao.name(pass.getName())) {
            cDao.add(pass);
            f = true;
        }
        return f;
    }
    
    /**
     * 删除
     */
    public void del(int id) {
        cDao.delete(id);
    }
    
    /**
     * 修改
     * @return 
     */
    public void update(Pass pass) {
        cDao.update(pass);
    }
    
    /**
     * 通过ID得到一个Course
     * @return 
     */
    public Pass getPassById(int id) {
        return cDao.getPassById(id);
    }

    /**
     * 通过Name得到一个Course
     * @return 
     */
    public Pass getPassByName(String name) {
        return cDao.getPassByName(name);
    }
    
    /**
     * 查找
     * @return 
     */
    public  List<Pass> search(String name, String vender, String xnumber,String standard) {
        return cDao.search(name, vender, xnumber,standard);
    }
    
    /**
     * 全部数据
     * @return 
     */
    public List<Pass> list() {
        return cDao.list();
    }
}

package servlet;
import java.io.IOException;
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 common.Pass;
import service.PassService;
@WebServlet("/PassServlet")
public class PassServlet  extends HttpServlet {
        
        private static final long serialVersionUID = 1L;

        PassService service = new PassService();
        
        /**
         * 方法选择
         */
        protected void service(HttpServletRequest req, HttpServletResponse resp)throws  ServletException,IOException{
            req.setCharacterEncoding("utf-8");
            String method = req.getParameter("method");
            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 ("getpassbyid".equals(method)) {
                getPassById(req, resp);
            } else if ("getpassbyname".equals(method)) {
                getPassByName(req, resp);
            } else if ("list".equals(method)) {
                list(req, resp);
            }
        }

        /**
         * 添加
         * @param req
         * @param resp
         * @throws IOException 
         * @throws ServletException 
         */
        private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException  {
            req.setCharacterEncoding("utf-8");
            String name = req.getParameter("name");
            String vender = req.getParameter("vender");
            String xnumber = req.getParameter("xnumber");
            String standard = req.getParameter("standard ");
            Pass pass = new Pass(name, vender,xnumber,standard);
            
            //添加后消息显示
            if(service.add(pass)) {
                req.setAttribute("message", "添加成功");
                req.getRequestDispatcher("add.jsp").forward(req,resp);
            } else {
                req.setAttribute("message", "产品重复，请重新录入");
                req.getRequestDispatcher("add.jsp").forward(req,resp);
            }
        }
        
        /**
         * 全部
         * @param req
         * @param resp
         * @throws ServletException 
         */
        private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
            req.setCharacterEncoding("utf-8");
            List<Pass> pass = service.list();
            req.setAttribute("pass", pass);
            req.getRequestDispatcher("list.jsp").forward(req,resp);
        }

        /**
         * 通过ID得到Pass
         * @param req
         * @param resp
         * @throws ServletException 
         */
        private void getPassById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
            req.setCharacterEncoding("utf-8");
            int id = Integer.parseInt(req.getParameter("id"));
            Pass pass = service.getPassById(id);
            req.setAttribute("pass", pass);
            req.getRequestDispatcher("detail2.jsp").forward(req,resp);
        }

        /**
         * 通过名字查找
         * 跳转至删除
         * @param req
         * @param resp
         * @throws IOException
         * @throws ServletException 
         */
        private void getPassByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
            req.setCharacterEncoding("utf-8");
            String name = req.getParameter("name");
            Pass pass = service.getPassByName(name);
            if(pass == null) {
                req.setAttribute("message", "查无此产品！");
                req.getRequestDispatcher("del.jsp").forward(req,resp);
            } else {
                req.setAttribute("pass", pass);
                req.getRequestDispatcher("detail.jsp").forward(req,resp);
            }
        }
        
        /**
         * 删除
         * @param req
         * @param resp
         * @throws IOException
         * @throws ServletException 
         */
        private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
            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);
        }
        
        /**
         * 修改
         * @param req
         * @param resp
         * @throws IOException
         * @throws ServletException 
         */
        private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
            req.setCharacterEncoding("utf-8");
            int id = Integer.parseInt(req.getParameter("id"));
            String name = req.getParameter("name");
            String vender = req.getParameter("vender");
            String xnumber = req.getParameter("xnumber");
            String standard=req.getParameter("standard");
            Pass pass = new Pass(id, name,vender, xnumber, standard);
            
            service.update(pass);
            req.setAttribute("message", "修改成功");
            req.getRequestDispatcher("PassServlet?method=list").forward(req,resp);
        }
        
        /**
         * 查找
         * @param req
         * @param resp
         * @throws ServletException 
         */
        private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
            req.setCharacterEncoding("utf-8");
            String name = req.getParameter("name");
            String vender = req.getParameter("vender");
            String xnumber = req.getParameter("xnumber");
            String standard=req.getParameter("standard");
            List<Pass> pass = service.search(name, vender, xnumber, standard);
            req.setAttribute("courses", pass);
            req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
        }
    }

<%@ 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;">产品信息录入</h1>
        <a href="index.jsp">返回主页</a>
        <form action="PassServlet?method=add" method="post" onsubmit="return check()">
            <div class="a">
                产品名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                生产厂家<input type="text" id="vender" name="vender" />
            </div>
            <div class="a">
                型号<input type="text" id="xnumber" name="xnumber" />
            </div>
            <div class="a">
                规格<input type="text" id="standard" name="standard" />
            <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 vender = document.getElementById("vender");
            var xnumber = document.getElementById("xnumber");
            var standard = document.getElementById("standard");
            //非空
            if(name.value == '') {
                alert('无此产品');
                name.focus();
                return false;
            }
            if(vender.value == '') {
                alert('不知厂家');
                vender.focus();
                return false;
            }
            if(xnumber.value == '') {
                alert('型号不明');
                xnumber.focus();
                return false;
            }
            if(standard.value == '') {
                alert('规格不明');
                standard.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;
    }
</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;">产品信息删除</h1>
        <a href="index.jsp">返回主页</a>
        <form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()">
            <div class="a">
                产品名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;找</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");;
            
            //非空
            if(name.value == '') {
                alert('无此产品');
                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;">产品信息删除</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>产品名称</td>
                <td>${pass.name}</td>
            </tr>
            <tr>
                <td>生产厂家</td>
                <td>${pass.vender}</td>
            </tr>
            <tr>
                <td>型号</td>
                <td>${pass.xnumber}</td>    
            </tr>
            <tr>
                <td>规格</td>
                <td>${pass.standard}</td>    
            </tr>
        </table>
        <div class="a">
            <a onclick="return check()" href="PassServlet?method=del&id=${pass.id}">删&nbsp;&nbsp;&nbsp;除</a>
        </div>
    </div>
    <script type="text/javascript">
        function check() {
            if (confirm("是否删除？")){
                return true;
            }else{
                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;
    }
</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;">产品信息修改</h1>
        <a href="index.jsp">返回主页</a>
        <form action="CourseServlet?method=update" method="post" onsubmit="return check()">
            <div class="a">
                产品名称<input type="text" id="name" name="name" value="${pass.name}"/>
            </div>
            <div class="a">
                生产厂家<input type="text" id="vender" name="vender" value="${pass.vender}"/>
            </div>
            <div class="a">
                型号<input type="text" id="xnumber" name="xnumber" value="${pass.xnumber}"/>
            </div>
            <div class="a">
                规格<input type="text" id="standard" name="standard" value="${pass.standard}"/>
            </div>
            <input type="hidden" id="id" name="id" value="${pass.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 vender = document.getElementById("vender");
            var xnumber = document.getElementById("xnumber");
            var standard = document.getElementById("standard");
            
            //非空
            if(name.value == '') {
                alert('无此产品');
                name.focus();
                return false;
            }
            if(vender.value == '') {
                alert('厂家不明');
                vender.focus();
                return false;
            }
            if(xnumber.value == '') {
                alert('型号不明');
                xnumber.focus();
                return false;
            }
            if(standard.value == '') {
                alert('规格不明');
                standard.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>首页</title>
<style>
    .a{
        font-size: 26px;
        margin-top: 20px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: red;">库存物资管理系统</h1>
        <div class="a">
            <a href="add.jsp">产品信息录入</a>
        </div>
        <div class="a">
            <a href="PassServlet?method=list">产品信息修改</a>
        </div>
        <div class="a">
            <a href="del.jsp">产品信息删除</a>
        </div>
        <div class="a">
            <a href="search.jsp">产品信息查询</a>
        </div>
    </div>
</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>
    <%
         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;">产品信息列表</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>id</td>
                <td>产品名称</td>
                <td>生产厂家</td>
                <td>型号</td>
                <td>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.vender}</td>
                    <td>${item.xnumber}</td>
                    <td>${item.standard}</td>
                    <td><a href="PassServlet?method=getpassbyid&id=${item.id}">修改</a></td>
                </tr>
            </c:forEach>
        </table>
    </div>
</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;
    }
</style>
</head>
<body>
    <div align="center">
        <h1 style="color: red;">产品信息查询</h1>
        <a href="index.jsp">返回主页</a>
        <form action="PassServlet?method=add" method="post" onsubmit="return check()">
            <div class="a">
                产品名称<input type="text" id="name" name="name"/>
            </div>
            <div class="a">
                生产厂家<input type="text" id="vender" name="vender" />
            </div>
            <div class="a">
                型号<input type="text" id="xnumber" name="xnumber" />
            </div>
            <div class="a">
                规格<input type="text" id="standard" name="standard" />
            <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 vender = document.getElementById("vender");
            var xnumber = document.getElementById("xnumber");
            var standard = document.getElementById("standard");
            
            //非空
            if(name.value == '' && vender.value == '' && xnumber.value == ''&&standard.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;">产品信息列表</h1>
        <a href="index.jsp">返回主页</a>
        <table class="tb">
            <tr>
                <td>id</td>
                <td>产品名称</td>
                <td>生产厂家</td>
                <td>型号</td>
                <td>规格<td>
            </tr>
            <!-- forEach遍历出adminBeans -->
            <c:forEach items="${pass}" var="item" varStatus="status">
                <tr>
                    <td>${item.id}</td>
                    <td><a>${item.name}</a></td>
                    <td>${item.vender}</td>
                    <td>${item.xnumber}</td>
                    <td>${item.standard}</td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>
</html>