库存物资管理系统

实验要求：

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。

 本次实验商品的增删改比较容易实现，但是商品的出库入库单据实现对我来说有点困难，后来向做完的同学请教，发现首先要建两个表，方便对商品出入库单据的记录，然后还有别的东西等等，真的学到很多

1.首先建两个数据表，一个用来储存商品，一个用来记录商品出库入库数据 。

2.新建4个包，entity存放实体类(Warehouse)，dao存放数据库操作类(WarehouseDao)，servlet存放控制类(WarehouseServlet)，service包为dao和Servlet的中间层，DButil存放开发帮助类(这里是数据库操作帮助类，封装了数据库连接部分代码，避免大量重复代码)

3.

//Warehouse.Java
package com.hjf.entity;

public class Warehouse {

	private int id;
	private String name;
	private String changjia;
	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 getChangjia() {
		return changjia;
	}

	public void setChangjia(String changjia) {
		this.changjia = changjia;
	}

	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 Warehouse() {}
	
	public Warehouse(int id, String name, String changjia, String xinghao,String guige) {
		this.id = id;
		this.name = name;
		this.changjia=changjia;
		this.xinghao=xinghao;
		this.guige=guige;
	}
	
	public Warehouse(String name, String changjia, String xinghao,String guige) {
		this.name = name;
		this.changjia=changjia;
		this.xinghao=xinghao;
		this.guige=guige;
	}
}

　　

//warehouseDao.java
package com.hjf.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 com.hjf.entity.Warehouse;
import com.hjf.util.DBUtil;

/**
 * 商品Dao
 * Dao层操作数据
 * @author Hu
 *
 */
public class WarehouseDao {

	/**
	 * 添加
	 * @param course
	 * @return
	 */
	public boolean add(Warehouse warehouse) {
		String sql = "insert into warehouse(name, changjia, xinghao,guige) values('" + warehouse.getName() + "','" + warehouse.getChangjia() + "','"+ warehouse.getXinghao() + "','"+warehouse.getGuige()+"')";
		//创建数据库链接
		Connection conn = DBUtil.getConn();
		Statement state = null;
		boolean f = false;
		int a = 0;
		
		try {
			state = conn.createStatement();
			a=state.executeUpdate(sql);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			//关闭连接
			DBUtil.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 warehouse 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;
	}

	/**
	 * 修改
	 * @param name
	 * @param pass
	 */
	public boolean update(Warehouse warehouse) {
		System.out.println(warehouse.getName());
		String sql = "update warehouse set name='" + warehouse.getName() + "', changjia='" + warehouse.getChangjia()+ "', xinghao='" + warehouse.getXinghao()+ "', guige='" + warehouse.getGuige()
			+ "' where id=" + warehouse.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;
	}
	
	/**
	 * 通过ID得到商品信息
	 * @param id
	 * @return
	 */
	public Warehouse getWarehouseById(int id) {
		String sql = "select * from warehouse where id =" + id;
		System.out.println("b"+id);
		Connection conn = DBUtil.getConn();
		Statement state = null;
		ResultSet rs = null;
		Warehouse warehouse = null;
		
		try {
			state = conn.createStatement();
			rs = state.executeQuery(sql);
			while (rs.next()) {
				String name = rs.getString("name");
				String changjia = rs.getString("changjia");
				String xinghao = rs.getString("xinghao");
				String guige = rs.getString("guige");
				warehouse = new Warehouse(id, name, changjia, xinghao,guige);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			DBUtil.close(rs, state, conn);
		}
		
		return warehouse;
	}
	
	/**
	 * 通过name得到warehouse
	 * @param name
	 * @return
	 */
	public Warehouse getWarehouseByName(String name) {
		String sql = "select * from warehouse where name ='" + name + "'";
		Connection conn = DBUtil.getConn();
		Statement state = null;
		ResultSet rs = null;
		Warehouse warehouse = null;
		
		try {
			state = conn.createStatement();
			rs = state.executeQuery(sql);
			while (rs.next()) {
				int id = rs.getInt("id");
				String changjia = rs.getString("changjia");
				String xinghao = rs.getString("xinghao");
				String guige = rs.getString("guige");
				warehouse = new Warehouse(id, name, changjia, xinghao,guige);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			DBUtil.close(rs, state, conn);
		}
		
		return warehouse;
	}
	
	/**
	 * 查找
	 * @param name
	 * @param teacher
	 * @param classroom
	 * @return
	 */
	public List<Warehouse> search(String name, String changjia, String xinghao) {
		String sql = "select * from warehouse where ";
		if (name != "") {
			sql += "name like '%" + name + "%'";
		}
		if (changjia != "") {
			sql += "changjia like '%" + changjia + "%'";
		}
		if (xinghao != "") {
			sql += "xinghao like '%" + xinghao + "%'";
		}
		List<Warehouse> list = new ArrayList<>();
		Connection conn = DBUtil.getConn();
		Statement state = null;
		ResultSet rs = null;

		try {
			state = conn.createStatement();
			rs = state.executeQuery(sql);
			Warehouse bean = null;
			while (rs.next()) {
				int id = rs.getInt("id");
				String name2 = rs.getString("name");
				String changjia2 = rs.getString("changjia");
				String xinghao2 = rs.getString("xinghao");
				String guige2=rs.getString("guige");
				bean = new Warehouse(id, name2, changjia2, xinghao2,guige2);
				list.add(bean);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			DBUtil.close(rs, state, conn);
		}
		
		return list;
	}
	
	/**
	 * 全部数据
	 * @param name
	 * @param teacher
	 * @param classroom
	 * @return
	 */
	public List<Warehouse> list() {
		String sql = "select * from warehouse";
		List<Warehouse> list = new ArrayList<>();
		Connection conn = DBUtil.getConn();
		Statement state = null;
		ResultSet rs = null;

		try {
			state = conn.createStatement();
			rs = state.executeQuery(sql);
			Warehouse bean = null;
			while (rs.next()) {
				int id = rs.getInt("id");
				String name2 = rs.getString("name");
				String changjia2 = rs.getString("changjia");
				String xinghao2 = rs.getString("xinghao");
				String guige2=rs.getString("guige");
				bean = new Warehouse(id, name2, changjia2, xinghao2,guige2);
				list.add(bean);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			DBUtil.close(rs, state, conn);
		}
		
		return list;
	}

}

　　

//WarehouseService.java
package com.hjf.service;

import java.util.List;
import com.hjf.dao.WarehouseDao;
import com.hjf.entity.Warehouse;

/**
 * CourseService
 * 服务层
 * @author Hu
 *
 */
public class WarehouseService {

    WarehouseDao wDao = new WarehouseDao();
    
    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(Warehouse warehouse) {
        boolean f =wDao.add(warehouse);
        return f;
    }
    
    /**
     * 删除
     */
    public void del(int id) {
        wDao.delete(id);
    }
    
    /**
     * 修改
     * @return 
     */
    public void update(Warehouse warehouse) {
        wDao.update(warehouse);
    }
    
    /**
     * 通过ID得到一个Course
     * @return 
     */
    public Warehouse getWarehouseById(int id) {
        return wDao.getWarehouseById(id);
    }

    /**
     * 通过Name得到一个Course
     * @return 
     */
    public Warehouse getWarehouseByName(String name) {
        return wDao.getWarehouseByName(name);
    }
    
    /**
     * 查找
     * @return 
     */
    public List<Warehouse> search(String name, String changjia, String xinghao) {
        return wDao.search(name, changjia, xinghao);
    }
    
    /**
     * 全部数据
     * @return 
     */
    public List<Warehouse> list() {
        return wDao.list();
    }
}

//WarehouseServlet.java
package com.hjf.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.hjf.entity.Warehouse;
import com.hjf.service.WarehouseService;

/**
 * Servlet implementation class WarehouseServlet
 */
@WebServlet("/WarehouseServlet")
public class WarehouseServlet extends HttpServlet {
	
	private static final long serialVersionUID = 1L;

	WarehouseService service = new WarehouseService();	
	/**
	 * 方法选择
	 */
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		String method = req.getParameter("method");
		/*获取对应的请求参数
      String method = request.getParameter("method");
            根据请求参数去调用对应的方法。*/
		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 ("getwarehousebyid".equals(method)) {
			getWarehouseById(req, resp);
		} else if ("getwarehousebyname".equals(method)) {
			getWarehouseByName(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");
		//获取数据
		String name = req.getParameter("name");
		String changjia = req.getParameter("changjia");
		String xinghao = req.getParameter("xinghao");
		String guige = req.getParameter("guige");
		Warehouse warehouse = new Warehouse(name, changjia, xinghao,guige);		
		//添加后消息显示
		if(service.add(warehouse)) {
			req.setAttribute("message", "添加成功");
			req.getRequestDispatcher("add.jsp").forward(req,resp);
		} else {
			req.setAttribute("message", "添加有误，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<Warehouse> warehouses = service.list();
		req.setAttribute("warehouses", warehouses);
		req.getRequestDispatcher("list.jsp").forward(req,resp);
	}

	/**
	 * 通过ID得到Warehouse
	 * @param req
	 * @param resp
	 * @throws ServletException 
	 */
	private void getWarehouseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
		req.setCharacterEncoding("utf-8");
		int id = Integer.parseInt(req.getParameter("id"));//返回的String类型转换成int 类型
		System.out.println("s"+id);
		Warehouse warehouse = service.getWarehouseById(id);
		req.setAttribute("warehouse", warehouse);
		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 getWarehouseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
		req.setCharacterEncoding("utf-8");
		String name = req.getParameter("name");
		Warehouse warehouse = service.getWarehouseByName(name);
		if(warehouse == null) {
			req.setAttribute("message", "查无此商品！");
			req.getRequestDispatcher("del.jsp").forward(req,resp);
		} else {
			req.setAttribute("warehouse", warehouse);
			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"));
		System.out.println("c"+id);
		String name = req.getParameter("name");
		String changjia = req.getParameter("changjia");
		String xinghao = req.getParameter("xinghao");
		String guige = req.getParameter("guige");
		Warehouse warehouse = new Warehouse(id,name, changjia, xinghao,guige);
		
		service.update(warehouse);
		req.setAttribute("message", "修改成功");
		req.getRequestDispatcher("WarehouseServlet?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 changjia = req.getParameter("changjia");
		String xinghao = req.getParameter("xinghao");
		List<Warehouse> warehouses = service.search(name, changjia,xinghao);
		req.setAttribute("warehouses", warehouses);
		req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
	}
}

　　

//DBUtil.java
package com.hjf.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 数据库连接工具
 * @author Hu
 *
 */
public class DBUtil {
	
	public static String db_url = "jdbc:mysql://localhost:3306/warehouse";
	public static String db_user = "root";
	public static String db_pass = "root";
	
	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();
			}
		}
	}

	public static void main(String[] args) throws SQLException {
		Connection conn = getConn();
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		String sql ="select * from warehouse";
		pstmt = conn.prepareStatement(sql);
		rs = pstmt.executeQuery();
		if(rs.next()){
			System.out.println("空");
		}else{
			System.out.println("不空");
		}
	}
}

　　

<!-- add.jsp -->
<%@ 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>

</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: black;">商品信息录入</h1>
		<a href="index.jsp">返回主页</a>
		<form action="WarehouseServlet?method=add" method="post" onsubmit="return check()">
			<div class="a">
				商品名称<input type="text" id="name" name="name"/>
			</div>
			<div class="a">
				商品厂家<input type="text" id="changjia" name="changjia" />
			</div>
			<div class="a">
				商品型号<input type="text" id="xinghao" name="xinghao" />
			</div>
			<div class="a">
				商品规格<input type="text" id="guige" name="guige" />
			</div>				
			<div class="a">
				<button type="submit" class="b">保   存</button>
			</div>
		</form>
	</div>
	<script type="text/javascript">
		function check() {
			var name = document.getElementById("name");;
			var changjia = document.getElementById("changjia");
			var xinghao = document.getElementById("xinghao");
			var guige = document.getElementById("guige");	
			//非空
			if(name.value == '') {
				alert('商品名称为空');
				name.focus();
				return false;
			}
			if(changjia.value == '') {
				alert('厂家为空');
				changjia.focus();
				return false;
			}
			if(xinghao.value == '') {
				alert('型号为空');
				xinghao.focus();
				return false;
			}
			if(guige.value == '') {
				alert('规格为空');
				guige.focus();
				return false;
			}
		}
	</script>
</body>
</html>

　　

<!-- del.jsp -->
<%@ 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>

</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: black;">商品信息删除</h1>
		<a href="index.jsp">返回主页</a>
		<form action="WarehouseServlet?method=getwarehousebyname" method="post" onsubmit="return check()">
			<div class="a">
				商品名称<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('商品名称为空');
				name.focus();
				return false;
			}
		}
	</script>
</body>
</html>

　　

<!-- detail.jsp -->
<%@ 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: black;">商品信息删除</h1>
		<a href="index.jsp">返回主页</a>
		<table class="tb">
			<tr>
				<td>商品名称</td>
				<td>${warehouse.name}</td>
			</tr>
			<tr>
				<td>商品厂家</td>
				<td>${warehouse.changjia}</td>
			</tr>
			<tr>
				<td>商品型号</td>
				<td>${warehouse.xinghao}</td>
			</tr>
			<tr>
				<td>商品规格</td>
				<td>${warehouse.guige}</td>
			</tr>
		</table>
		<div class="a">
			<a onclick="return check()" href="WarehouseServlet?method=del&id=${warehouse.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>

　　

<!-- detail2.jsp -->
<%@ 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>

</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: black;">商品信息修改</h1>
		<a href="index.jsp">返回主页</a>
		<form action="WarehouseServlet?method=update" method="post" onsubmit="return check()">
			<div class="a">
				商品名称<input type="text" id="name" name="name" value="${warehouse.name}"/>
			</div>
			<div class="a">
				商品厂家<input type="text" id="changjia" name="changjia" value="${warehouse.changjia}"/>
			</div>
			<div class="a">
				商品型号<input type="text" id="xinghao" name="xinghao" value="${warehouse.xinghao}"/>
			</div>
			<div class="a">
				商品规格<input type="text" id="guige" name="guige" value="${warehouse.guige}"/>
			</div>			
			<input type="hidden" id="id" name="id" value="${warehouse.id}"/>
			<div class="a">
				<button type="submit" class="b">修   改</button>
			</div>
		</form>
	</div>
	<script type="text/javascript">
		function check() {
			var name = document.getElementById("name");;
			var changjia = document.getElementById("changjia");
			var xinghao = document.getElementById("xinghao");
			var guige = document.getElementById("guige");
			
			//非空
			if(name.value == '') {
				alert('课程名称为空');
				name.focus();
				return false;
			}
			if(changjia.value == '') {
				alert('厂家为空');
				changjia.focus();
				return false;
			}
			if(xinghao.value == '') {
				alert('型号为空');
				xinghao.focus();
				return false;
			}
			if(guige.value == '') {
				alert('规格为空');
				guige.focus();
				return false;
			}
			
		}
	</script>
</body>
</html>

　　

<!-- index.jsp -->
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>

</head>
<body>
	<div align="center">
		
		<div class="a">
			<a href="add.jsp">商品信息添加</a>
		</div>
		<div class="a">
			<a href="WarehouseServlet?method=list">商品信息修改</a>
		</div>
		<div class="a">
			<a href="del.jsp">商品信息删除</a>
		</div>
		<div class="a">
			<a href="search.jsp">商品信息查询</a>
		</div>
	</div>
</body>
</html>

　　

<!-- list.jsp -->
<%@ 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>

</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: black;">商品信息列表</h1>
		<a href="index.jsp">返回主页</a>
		<table class="tb">
			<tr>
				<td>id</td>
				<td>商品名称</td>
				<td>商品厂家</td>
				<td>商品型号</td>
				<td>商品规格</td>
				<td align="center" colspan="2">操作</td>
			</tr>
			<c:forEach items="${warehouses}" var="item"><!-- {}里面表示数组名 -->
				<tr>
					<td>${item.id}</td>
					<td>${item.name}</td>
					<td>${item.changjia}</td>
					<td>${item.xinghao}</td>
					<td>${item.guige}</td>
					<td><a href="WarehouseServlet?method=getwarehousebyid&id=${item.id}">修改</a></td>
					
				</tr>
			</c:forEach>
		</table>
	</div>
</body>
</html>

　　

<!-- search.jsp -->
<%@ 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>

</head>
<body>
	<div align="center">
		<h1 style="color: black;">商品信息查询</h1>
		<a href="index.jsp">返回主页</a>
		<form action="WarehouseServlet?method=search" method="post" onsubmit="return check()">
			<div class="a">
				商品名称<input type="text" id="name" name="name"/>
			</div>
			<div class="a">
				商品厂家<input type="text" id="changjia" name="changjia" />
			</div>
			<div class="a">
				商品型号<input type="text" id="xinghao" name="xinghao" />
			</div>
			<div class="a">
				<button type="submit" class="b">查   询</button>
			</div>
		</form>
	</div>
	<script type="text/javascript">
		function check() {
			var name = document.getElementById("name");
			var changjia = document.getElementById("changjia");
			var xinghao = document.getElementById("xinghao");
			
			//非空
			if(name.value == '' && changjia.value == '' && xinghao.value == '') {
				alert('请填写一个条件');
				return false;
			}
		}
	</script>
</body>
</html>

　　

<!-- searchlist.jsp -->
<%@ 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>

</head>
<body>
	<div align="center">
		<h1 style="color: black;">商品信息列表</h1>
		<a href="index.jsp">返回主页</a>
		<table class="tb">
			<tr>
				<td>id</td>
				<td>商品名称</td>
				<td>商品厂家</td>
				<td>商品型号</td>
			</tr>
			<!-- forEach遍历出adminBeans -->
			<c:forEach items="${warehouses}" var="item" varStatus="status">
				<tr>
					<td>${item.id}</td>
					<td><a>${item.name}</a></td>
					<td>${item.changjia}</td>
					<td>${item.xinghao}</td>
					<td>${item.guige}</td>
				</tr>
			</c:forEach>
		</table>
	</div>
</body>
</html>


最后运行结果如下：