chatservlet.java

一个培训时候的ajax学习例子 很有用的。兄弟们可以试试。ajax级联菜单的实现以及频聊功能的实现。

package com.briup.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.List;
import java.util.Vector;

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

public class ChatServlet extends HttpServlet {
	private List<Message> messages
					=new Vector<Message>();
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
			doPost(request,response);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String action
				=request.getParameter("action");
		
		if("send".equals(action)){
			//
			String msg
					=request.getParameter("msg");
			String sender
			=(String) request.getSession()
						.getAttribute("user");
			Message message=new Message();
			message.setContent(msg);
			if(sender!=null)
			message.setSender(sender);
			message.setSendDate(new Date());
			messages.add(message);
		}else if("query".equals(action)){
			request.setAttribute(
					"messages", messages);
			RequestDispatcher rd
			=request.getRequestDispatcher(
								"messages.jsp");
			rd.forward(request, response);
		}
	}

}