【javaweb】库存物资管理系统思路与总结

题目：

1、有一个存放商品的仓库，每天都有商品出库和入库。

2、每种商品都有名称、生产厂家、型号、规格等。

3、出入库时必须填写出入库单据，单据包括商品名称、生产厂家、型号、 规格、数量、日期、时间、入库单位（或出库单位）名称、送货（或提货）人 姓名。

首先建立数据库goodsmanager

table:goods记录商品信息

table:list记录出入库信息

Java部分：

先把页面写好

首页面用<iframe>分为左侧导航栏，和右侧页面

点击左侧超链接即可实现右侧页面的跳转，在left.jsp中使用<a>的target属性来控制

<div>
<div><a style="color:blue" target="right" href="select.jsp">查询</a></div><br/>
<div><a style="color:blue" target="right" href="out.jsp">出库</a></div><br/>
<div><a style="color:blue" target="right" href="in.jsp">入库</a></div><br/>
<div><a style="color:blue" target="right" href="1.jsp">增加商品</a></div><br/>
<div><a style="color:blue" target="right" href="2.jsp">删除商品</a></div><br/>
<div><a style="color:blue" target="right" href="3.jsp">修改商品</a></div><br/>
<div><a style="color:blue" target="right" href="4.jsp">查询商品</a></div><br/>
</div>

验证跳转没有问题后，先写出库和入库。

新建数据库连接工具DB.java，放到com.ccr.jap.util包下

新建GoodsBean和ListBean，包括对应的私有变量和get、set函数

新建GoodsDao、ListDao进行数据库的增删改查操作

入库涉及到两种情况：

1、商品已存在

2、商品未存在

首先调用GoodsDao里的chick()函数，如果商品存在，返回id，否则返回-1；

public int chick(GoodsBean g)
    {
        int i=-1;//i>0查询有结果
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        ResultSet rs =stm.executeQuery("select id from goods where name='"+g.getName()+"' and PM='"+g.getPM()+"' and type='"+g.getType()+"' and specification='"+g.getSpecification()+"'");
        if(rs.next())
        {
            i=rs.getInt("id");
        }
        } 
        catch (Exception e) 
        {
        e.printStackTrace();
        }
        return i;
    }

如果存在，直接修改商品数量

public boolean update(int number,int i)
    {
        int num=0;
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        ResultSet rs =stm.executeQuery("select number from goods where id="+i);
        System.out.println("update"+i+"num "+number);
        rs.next();
        num=rs.getInt("number");
        System.out.print(num+"+"+number);
        num=num+number;
        System.out.println("="+num);
        stm.execute("update goods set number="+num+" where id="+i);
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }

不存在，则新建商品信息

public boolean insert(GoodsBean g)
    {
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        stm.execute("insert into goods(name,PM,type,specification,number) values ('"+g.getName()+"','"+g.getPM()+"','"+g.getType()+"','"+g.getSpecification()+"',"+g.getNumber()+")");
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }

然后调用ListDao里的insert()函数新建入库信息

public boolean insert(ListBean l)
    {
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        stm.execute("insert into list(name,PM,type,specification,number,units,PName,io,date) "
                + "values ('"+l.getName()+"','"+l.getPM()+"','"+l.getType()+"','"+l.getSpecification()+"',"+l.getNumber()+",'"+l.getUnits()+"','"+l.getPName()+"','"+l.getIo()+"','"+l.getDate()+"')");
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }

出库同理，但是在number赋值前先乘以-1变成负数

然后是servlet和jsp部分

入库：

<h1>入库</h1>
<form method="post" action="GoodsServlet?action=in">
<div>
    <div>
        <div style="display:inline"><label for="name">&nbsp;&nbsp;名&nbsp;&nbsp;&nbsp;&nbsp;称&nbsp;&nbsp;</label></div>
        <div style="display:inline"><input type="text" name="name" id="name"></div>
    </div><br/>
    <div>
        <div style="display:inline"><label for="name">&nbsp;&nbsp;型&nbsp;&nbsp;&nbsp;&nbsp;号&nbsp;&nbsp;</label></div>
        <div style="display:inline"><input type="text" name="type" id="type"></div>
    </div><br/>
    <div>
        <div style="display:inline"><label for="name">出产厂家</label></div>
        <div style="display:inline"><input type="text" name="PM" id="PM"></div>
    </div><br/>
    <div>
        <div style="display:inline"><label for="name">&nbsp;&nbsp;规&nbsp;&nbsp;&nbsp;&nbsp;格&nbsp;&nbsp;</label></div>
        <div style="display:inline"><input type="text" name="specification" id="specification"></div>
    </div><br/>
    <div>
        <div style="display:inline"><label for="name">入库单位</label></div>
        <div style="display:inline"><input type="text" name="units" id="units"></div>
    </div><br/>
    <div>
        <div style="display:inline"><label for="name">送货人名</label></div>
        <div style="display:inline"><input type="text" name="PName" id="PName"></div>
    </div><br/>
    <div>
        <div style="display:inline"><label for="name">&nbsp;&nbsp;数&nbsp;&nbsp;&nbsp;&nbsp;量&nbsp;&nbsp;</label></div>
        <div style="display:inline"><input type="text" name="number" id="number"></div>
    </div><br/>
    <div>
        <div><input type="submit" value="提交"></div>
    </div>
</div>
</form>

提交form表单到GoodsServlet，并附加信息action=in，出库同理

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        response.setHeader("content-type", "text/html;charset=UTF-8");
        String action=request.getParameter("action");
        if(action.equals("select"))
        {
            select(request,response);
        }
        if(action.equals("in"))
        {
            in(request,response);
        }
        if(action.equals("out"))
        {
            out(request,response);
        }
    }
protected void in(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        int id=-2;
        ListBean b=new ListBean();
        GoodsBean g=new GoodsBean();
        GoodsDao gd=new GoodsDao();
        ListDao ld=new ListDao();
        b.setName(request.getParameter("name"));
        b.setPM(request.getParameter("PM"));
        b.setType(request.getParameter("type"));
        b.setSpecification(request.getParameter("specification"));
        b.setNumber(Integer.parseInt(request.getParameter("number")));
        b.setUnits(request.getParameter("units"));
        b.setPName(request.getParameter("PName"));
        b.setIo("in");
        b.setDate();
        ld.insert(b);
        
        
        g.setName(request.getParameter("name"));
        g.setPM(request.getParameter("PM"));
        g.setType(request.getParameter("type"));
        g.setSpecification(request.getParameter("specification"));
        g.setNumber(Integer.parseInt(request.getParameter("number")));
        id=gd.chick(g);
        System.out.println(id);
        if(id>0)
        {
            gd.update(b.getNumber(), id);
        }
        else
        {
            gd.insert(g);
        }
        request.getRequestDispatcher("in.jsp").forward(request,response);
    }
    protected void out(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        int id=-2;
        ListBean b=new ListBean();
        GoodsBean g=new GoodsBean();
        GoodsDao gd=new GoodsDao();
        ListDao ld=new ListDao();
        b.setName(request.getParameter("name"));
        b.setPM(request.getParameter("PM"));
        b.setType(request.getParameter("type"));
        System.out.println(b.getType());
        b.setSpecification(request.getParameter("specification"));
        int number=Integer.parseInt(request.getParameter("number"));
        number=-1*number;
        System.out.println("SN"+number);
        b.setNumber(number);
        b.setUnits(request.getParameter("units"));
        b.setPName(request.getParameter("PName"));
        b.setIo("out");
        b.setDate();
        ld.insert(b);
        
        
        g.setName(request.getParameter("name"));
        g.setPM(request.getParameter("PM"));
        g.setType(request.getParameter("type"));
        g.setSpecification(request.getParameter("specification"));
        g.setNumber(number);
        id=gd.chick(g);
        if(id>0)
        {
            gd.update(b.getNumber(), id);
        }
        else
        {
            System.out.println("错误");
        }
        request.getRequestDispatcher("out.jsp").forward(request,response);
    }

查询：在页面中，输入日期和时间，点击查询按钮，出现查询结构

调用ListDao的Select，使用名称和日期进行查询，将结果存在List中

jsp代码

<h1>信息查询</h1>
<form method="post" action="GoodsServlet?action=select">
    <div>
        <div>
            <div><label>产品名称</label></div>
            <div><input type="text" name="name" id="name"></div>
        </div>
        <div>
            <div><label>日期</label></div>
            <div><input type="text" name="date" id="date"></div>
        </div>
        <div>
            <input type="submit" value="查询">
        </div>
    </div>
</form>
<c:set var="list" value="${sessionScope.l}"></c:set>
<c:if test="${l!=null }">
<c:forEach var="i" begin="0" end="${l.size()-1}">
&nbsp;名称&nbsp;${l[i].getName()}
&nbsp;型号&nbsp;${l[i].getType()}
&nbsp;出产厂家&nbsp;${l[i].getPM()}
&nbsp;规格&nbsp;${l[i].getSpecification()}
&nbsp;数量&nbsp;${l[i].getNumber()}
&nbsp;单位&nbsp;${l[i].getUnits()}
&nbsp;姓名&nbsp;${l[i].getPName()}
&nbsp;操作&nbsp;${l[i].getIo()}
&nbsp;日期&nbsp;${l[i].getDate()}
<br/>
</c:forEach>
</c:if>

使用了EL语句和JSTL标签进行遍历

Java代码：

public List<ListBean> select(String name,String date)
    {
        List<ListBean> l=new ArrayList<ListBean>();
        ListBean b=null;
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        ResultSet rs = stm.executeQuery("select * from list where name like '%"+name+"%' and date ='"+date+"'");
        while(rs.next())
        {
            b=new ListBean();
            b.setName(rs.getString("name"));
            b.setPM(rs.getString("PM"));
            b.setType(rs.getString("type"));
            b.setSpecification(rs.getString("specification"));
            b.setNumber(rs.getInt("number"));
            b.setUnits(rs.getString("units"));
            b.setPName(rs.getString("PName"));
            b.setIo(rs.getString("io"));
            b.setDate(rs.getString("date"));
            l.add(b);
        }
        } catch (Exception e) 
        {
        e.printStackTrace();
        
        }
        return l;
    }

GoodsServlet：

protected void select(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String name=request.getParameter("name");
        String date=request.getParameter("date");
        ListDao d=new ListDao();
        List<ListBean>l=d.select(name,date);
        request.getSession().setAttribute("l", l);
        request.getRequestDispatcher("select.jsp").forward(request,response);
    }

第二部分：商品的增删改查

首先写好Dao相关的操作函数

public class GoodsDao
{
    public boolean delete(String name)
    {
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        stm.execute("delete from goods where name='"+name+"'");
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }
    public List<GoodsBean> select(String name)
    {
        List<GoodsBean> l=new ArrayList<GoodsBean>();
        GoodsBean b=null;
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        ResultSet rs = stm.executeQuery("select * from goods where name like '%"+name+"%'");
        while(rs.next())
        {
            b=new GoodsBean();
            b.setName(rs.getString("name"));
            b.setPM(rs.getString("PM"));
            b.setType(rs.getString("type"));
            b.setSpecification(rs.getString("specification"));
            b.setNumber(rs.getInt("number"));
            l.add(b);
        }
        } catch (Exception e) 
        {
        e.printStackTrace();
        
        }
        return l;
    }
    public boolean insert(GoodsBean g)
    {
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        stm.execute("insert into goods(name,PM,type,specification,number) values ('"+g.getName()+"','"+g.getPM()+"','"+g.getType()+"','"+g.getSpecification()+"',"+g.getNumber()+")");
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }
    public boolean update(int number,int i)
    {
        int num=0;
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        ResultSet rs =stm.executeQuery("select number from goods where id="+i);
        System.out.println("update"+i+"num "+number);
        rs.next();
        num=rs.getInt("number");
        System.out.print(num+"+"+number);
        num=num+number;
        System.out.println("="+num);
        stm.execute("update goods set number="+num+" where id="+i);
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }
    public boolean update(String name,GoodsBean b)
    {
        System.out.println("Dao"+name+b.getName()+b.getType());
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        stm.execute("update goods set name='"+b.getName()+"',type='"+b.getType()+"',PM='"+b.getPM()+"',specification='"+b.getSpecification()+"' where name='"+name+"'");
        }
        catch (Exception e) 
        {
        e.printStackTrace();
        return false;
        }
        return true;
    }
    public int chick(GoodsBean g)
    {
        int i=-1;//i>0查询有结果
        DB db=new DB();
        Connection con = db.getCon();
        try
        {
        Statement stm = con.createStatement();
        ResultSet rs =stm.executeQuery("select id from goods where name='"+g.getName()+"' and PM='"+g.getPM()+"' and type='"+g.getType()+"' and specification='"+g.getSpecification()+"'");
        if(rs.next())
        {
            i=rs.getInt("id");
        }
        } 
        catch (Exception e) 
        {
        e.printStackTrace();
        }
        return i;
    }
}

在修改时，重构一个参数为GoodsBean和name的函数

然后写servlet（由于之前忘了写这一部分，所以直接起名为GoodsServlet2）

package com.ccr.jsp.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 com.ccr.jsp.bean.GoodsBean;
import com.ccr.jsp.bean.ListBean;
import com.ccr.jsp.dao.GoodsDao;
import com.ccr.jsp.dao.ListDao;

/**
 * Servlet implementation class GoodsServlet2
 */
@WebServlet("/GoodsServlet2")
public class GoodsServlet2 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GoodsServlet2() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        response.setHeader("content-type", "text/html;charset=UTF-8");
        String action=request.getParameter("action");
        if(action.equals("add"))
        {
            System.out.println("add");
            add(request,response);
        }
        if(action.equals("delete"))
        {
            delete(request,response);
        }
        if(action.equals("update"))
        {
            update(request,response);
        }
        if(action.equals("select"))
        {
            select(request,response);
        }
        if(action.equals("select2"))
        {
            select2(request,response);
        }
    }
    protected void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        int id=-2;
        GoodsBean g=new GoodsBean();
        GoodsDao gd=new GoodsDao();
        g.setName(request.getParameter("name"));
        g.setPM(request.getParameter("PM"));
        g.setType(request.getParameter("type"));
        g.setSpecification(request.getParameter("specification"));
        g.setNumber(0);
        System.out.println(id);
        gd.insert(g);
        request.getRequestDispatcher("1.jsp").forward(request,response);
    }
    protected void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String name=request.getParameter("name");
        GoodsDao gd=new GoodsDao();
        gd.delete(name);
        request.getRequestDispatcher("2.jsp").forward(request,response);
    }
    protected void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String name=request.getParameter("name0");
        System.out.println("SNAME"+name);
        GoodsBean g=new GoodsBean();
        GoodsDao gd=new GoodsDao();
        g.setName(request.getParameter("name"));
        g.setPM(request.getParameter("PM"));
        g.setType(request.getParameter("type"));
        g.setSpecification(request.getParameter("specification"));
        System.out.println(g.getName()+g.getType());
        gd.update(name,g);
        request.getRequestDispatcher("3.jsp").forward(request,response);
    }
    protected void select(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String name=request.getParameter("name0");
        System.out.println("name="+name);
        GoodsDao gd=new GoodsDao();
        List<GoodsBean>gl=gd.select(name);
        System.out.println(gl.size());
        request.getSession().setAttribute("gl", gl);
        request.getRequestDispatcher("4.jsp").forward(request,response);
    }
    protected void select2(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String name=request.getParameter("name0");
        System.out.println("name="+name);
        GoodsDao gd=new GoodsDao();
        List<GoodsBean>gl=gd.select(name);
        System.out.println(gl.size());
        request.getSession().setAttribute("gl", gl);
        request.getRequestDispatcher("3.jsp").forward(request,response);
    }
}

在插入时，直接设置数量为0

最后设计一下界面。完工！

总结：

1、新学习了el语句和JSTL标签库的一些使用，很方便

2、复制代码很快，但是很容易出错