我想做一个服务器每一秒主动向浏览器推送一个时间的demo.程序如下：
servlet
public class CometTest extends HttpServlet implements CometProcessor {
private static final long serialVersionUID = 1L;
public CometTest() {
super();
}
@Override
public void event(CometEvent ce) throws IOException, ServletException{
HttpServletRequest request = ce.getHttpServletRequest();
HttpServletResponse response = ce.getHttpServletResponse();
response.setHeader("Content-type", "text/html; charset=utf8");
if(ce.getEventType() == EventType.BEGIN){
HttpSession session = request.getSession();
System.out.println(session.getId()+"已初始化");
}else if(ce.getEventType() == EventType.READ){
Sender s = new Sender(response);
s.start();
}else if(ce.getEventType() == EventType.ERROR){
System.out.println(ce.getEventSubType());
}
}
}
Sender(用于推送消息的线程类)
public class Sender extends Thread{
private HttpServletResponse response;
private PrintWriter pw;
public Sender(HttpServletResponse response) throws IOException{
this.response = response;
pw = this.response.getWriter();
}
@Override
public void run() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
while(true){
pw.write(sdf.format(new Date()));
pw.flush();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
jsp页面
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script>
function go() {
$.ajax({
url : "http://localhost:8080/cometTest/comet",
type : "post",
dataType : "text",
data : {
"name" : "zdc"
},
complete : function(xh, data) {
$("#text1").html(xh.responseText);
},
});
}
</script>
</head>
<body>
<input type="button" id="b1" onclick="go()" value="click" />
<label id="text1"></label><br/>
</body>
</html>
目的是进行循环的推时间到客户端，而结果是客户只收到一次推送后，服务器端报错（如下）：
7719C3E7EC73EC3DEE51DA998BBFEC0F已初始化
IOEXCEPTION
九月 15, 2015 10:06:06 下午 org.apache.catalina.connector.CoyoteAdapter checkRecycled
信息: Encountered a non-recycled response and recycled it forcedly.
org.apache.catalina.connector.CoyoteAdapter$RecycleRequiredException
at org.apache.catalina.connector.CoyoteAdapter.checkRecycled(CoyoteAdapter.java:592)
at org.apache.coyote.http11.AbstractHttp11Processor.recycle(AbstractHttp11Processor.java:1814)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.release(Http11NioProtocol.java:218)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:703)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1753)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1712)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
