从servlet传数据到jsp

servlet文件

package com.mi.servlet;

import java.io.IOException;


import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mi.beans.*;
import java.sql.*;
import java.util.ArrayList;
public class List_book extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Connection conn = null;
		Statement sta = null;
		ResultSet res = null;
		conn = DBConn.getConn();
		//声明一个ArrayList.用来存放Book类中的数据
		ArrayList<Book> list = new ArrayList<Book>();
		try {
			sta = conn.createStatement();
			String sql = "select * from book;";
			res = sta.executeQuery(sql);
			while (res.next()) {
				//建立了一个实体类,用来存放从数据库中拿到的数据
				Book book = new Book();
				book.setName(res.getString("name"));
				book.setAuthor(res.getString("author"));
				book.setPrice(res.getString("price"));
				book.setCountry(res.getString("country"));
				list.add(book);
			}
			//将list数据打包
			request.setAttribute("list", list);
			
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		//将list数据发送到.jap文件中
		request.getRequestDispatcher("ListBook.jsp").forward(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

jsp文件

<%@page import="com.mi.beans.Book"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'ListBook.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<script>
	</script>
  </head>
  <body>
  		<!-- 用jsp语句,将servlet传过来的list数据拿到,并放到一个list中 -->
  	<% 
  		ArrayList list = (ArrayList) request.getAttribute("list");
  	%>
  	<!-- 声明一个表格,这是表头 -->
  	<h2 align = "center">图书列表</h2>
  	<table border = 1px align = "center">
  		<tr>
  			<th>图书名称</th>
  			<th>图书作者</th>
  			<th>图书价格</th>
  			<th>所属国家</th>
  		</tr>
  		<!-- 继续使用jsp语句 循环放入存放于list中的Book实体类中的数据 -->
  		<%
  			for(int i = 0;i<list.size();i++){
  				Book book =(Book) list.get(i);%>
  				<tr>
  				<th><%=book.getName() %></th>
  				<th><%=book.getAuthor()%></th>
  				<th><%=book.getPrice()%></th>
  				<th><%=book.getCountry()%></th><br>
  				
  				<!-- 此处设置了一个修改<a>标签,做修改操作.并将上面拿到的数据传给update.jsp,当进入修改页面的时候,原来的数据会显示 -->
  				<th><a href="update.jsp?name=<%=book.getName()%>&author=<%=book.getAuthor()%>&
  				&country=<%=book.getCountry()%>&price=<%=book.getPrice()%>">修改</a> 
  				<!-- 删除操作,只把name字段传给Delete_Servlet.java,用来做删除操作 -->
  				<a href="Delete_Servlet?de_name=<%=book.getName()%>" onclick="confirm('确定删除该条记录?')">删除</a>
  				</th>
  		<% }
  		 %>
  	</table>
  </body>
</html>

从servlet传数据到jsp

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