exit.java

一个简单的局域网网聊天程序 用Eclipse编写 数据库为SQL Server2

package com.xj.serv;

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

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

import com.xj.bean.StringBufferClass;
import com.xj.bean.array;

public class exit extends HttpServlet {

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

		doPost(request, response);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		HttpSession session = request.getSession();
		String name=session.getAttribute("username").toString();
		ServletContext application = getServletContext();
		
		StringBuffer sb=(StringBuffer)application.getAttribute("message");
		if(sb==null){
			sb=new StringBuffer("");
		}
		StringBufferClass sbc=new StringBufferClass(sb);
		String quit="<br><font color=red>"+name+"</font><font color=gray>已经退出聊天室</font><br><br>";
		sb=sbc.getSb(quit);
		application.setAttribute("message", sb);
		
		
		ArrayList arr = (ArrayList)application.getAttribute("userlist");
		array a = new array(arr);
		a.removeAyyayList(name);
		session.invalidate();
		
	}

}