文章目录

7.7.4 案例:模拟查询所有门店功能

1、创建一个Servlet程序，用于处理查询所有门店信息请求

package cn.edut;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

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

/** * 模拟查询门店信息 - 【案例】 * Servlet implementation class DoorListServlet */
public class DoorListServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/** * @see HttpServlet#HttpServlet() */
	public DoorListServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		//response.getWriter().append("Served at: ").append(request.getContextPath());
		//不加这个，有中文，一定乱码
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		//1.查询所有门店信息，返回一个门店集合 List ArrayList
		String d1 = "永和大王北三环店,010-787878787878" ;  
		String d2 = "永和大王北四环店,020-123131312313" ;  
		String d3 = "永和大王北五环店,030-654645645654" ;  
		String d4 = "永和大王北六环店,040-542272727272" ;
		List<String > list = new ArrayList<>();
		list.add(d1);
		list.add(d2);
		list.add(d3);
		list.add(d4);
				
		//2.将所有门店信息集合存入 rquest域 中
		request.setAttribute("doorList", list);
		
		//3.将request及其中的数据转发到doorList.jsp
		request.getRequestDispatcher("doorList.jsp").forward(request, response);
		
	}

	/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

2、创建一个JSP，用于显示所有门店信息

<%@page import="java.util.Iterator"%>
<%@page import="java.util.List"%>
<%@page import="java.util.Date"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>门店信息 ^_^</title>
</head>
<body>
	<% 
		List list = (List)request.getAttribute("doorList") ;
		Iterator it = list.iterator() ; 
		while(it.hasNext()){
			out.print(it.next()+"<br>");
		}
	%>
	 
	<%="<p>"+new Date() +"</p>"%>
	<hr>
</body>
</html>

测试