基于jsp的留言板（session）

package com.message.user;

public class User {
	private String userName;
	private String userMessage;
	private String userLeaveMessageTime;
	public User(){}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getUserMessage() {
		return userMessage;
	}
	public void setUserMessage(String userMessage) {
		this.userMessage = userMessage;
	}
	public String getUserLeaveMessageTime() {
		return userLeaveMessageTime;
	}
	public void setUserLeaveMessageTime(String userLeaveMessageTime) {
		this.userLeaveMessageTime = userLeaveMessageTime;
	}
	public User(String userName, String userMessage, String userLeaveMessageTime) {
		super();
		this.userName = userName;
		this.userMessage = userMessage;
		this.userLeaveMessageTime = userLeaveMessageTime;
	}
	
}

package com.message.user;


import java.io.IOException;
import java.util.*;

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

@WebServlet(name="MessageServlet",
			urlPatterns="/messageservlet")


public class MessageServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException{
		User user=new User();
		
		user.setUserMessage(request.getParameter("usermessage"));
		user.setUserName(request.getParameter("username"));
		user.setUserLeaveMessageTime(new java.text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss")
									.format(new Date()).toString());
		
		List
 
   userList=(List
  
   )request.getSession().getAttribute("userlist"); if(userList==null) { userList=new ArrayList
   
    (); } userList.add(user); request.getSession().setAttribute("userlist", userList); request.getRequestDispatcher("Message.jsp").forward(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ doGet(request,response); } }
   
  
 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" language="java"%>





 




 

  
	姓名：
  
	
  

	
  

	信息：
  
	
  

	
  
	
  

 

<%@ page language="java" contentType="text/html; UTF-8"
    pageEncoding="UTF-8"%>
<%@page import="java.util.*"%>
<%@ page import="com.message.user.User" %>




 



	继续留言
	

	


	<%
	@SuppressWarnings("unchecked")
	
	ArrayList
 
   userList=(ArrayList
  
   )session.getAttribute("userlist"); for(int i=0;i
   
    "+userList.get(i).getUserLeaveMessageTime()+""+""+"" +userList.get(i).getUserName()+":" +userList.get(i).getUserMessage()+""+""+""); %>