userpeopleview.java

JAVA聊天室servlet实现 纯servlet实现的聊天系统 注释清楚 易于理解

package com.view;

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.bean.*;
/**
 * 打印已登录的用户的视图
 * @author Administrator
 *
 */

	

	public class UserPeopleView extends HttpServlet{
		public void doGet(HttpServletRequest request,HttpServletResponse response) throws
			ServletException,IOException {
			response.setContentType("text/html;charset=GBK");
			response.setHeader("refresh", "1");
			PrintWriter pw =response.getWriter();
			pw.println("在线用户");
			pw.println("<br>");
			
			
			ServletContext application =this.getServletContext();//获取application
			ArrayList<UserInfoBean> al= (ArrayList)application.getAttribute("al");
			
			HttpSession seesion =request.getSession();
			UserInfoBean uib =(UserInfoBean)seesion.getAttribute("uib");
			for (int i=0;i<al.size();i++) {
				if (al.get(i).equals(uib)) {
					pw.println("<font color=red>"+al.get(i).getUserName()+"</font><br>");
				} else {
					pw.println(al.get(i).getUserName()+"<br>");
				}
			}
			}
		}