标签：
引自：http://www.cnblogs.com/AloneSword/p/3517463.html
http://www.cnblogs.com/wei2yi/archive/2011/03/23/1992830.html
代码示例：
1.iframe实现长连接
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Insert title here</title> </head> <script type="text/javascript" src="jquery-1.9.1.js"></script> <script> function loadData(){ $(‘#logs‘).append(new Date()); } </script> <body> <iframe id="frame" name="polling" src="/myweb/TestLongPolling"></iframe> <div id="logs"></div> </body> </html>
package bookstore; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class TestLongPolling */ @WebServlet("/TestLongPolling") public class TestLongPolling extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public TestLongPolling() { 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 doPost(request,response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub int i = 0; boolean boo = true; String result = null; while(boo){ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } result = "hello I‘m server"+i;//要打印到前台的字符 //sendMsg(result,response,"msg");//msg是test.jsp中的那个js方法的名称 response.setContentType("text/html;charset=GBK"); response.getWriter().write( "<script type=‘text/javascript‘>parent.loadData()</script>"); response.flushBuffer(); i++; if(i==10){ boo = false; } } } }
2.web socket
待续....
【转】轮询、长轮询、iframe长连接、web socket
标签：
原文地址：http://www.cnblogs.com/grape1211/p/4231631.html
