<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.json-2.2.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.cometd.js"></script>
</head>
<body>
<input type="button" value="hehe" onclick="test()" />
</body>
<script type="text/javascript">
$(function(){
$.comet.init("${pageContext.request.contextPath}/cometd/cometd");
$.comet.subscribe("/test/task", callback);
});
function callback(msg){
alert("eheh进来了");
if(msg&&msg.data&& msg.data.test){
alert(msg.data.test);
}
}
function test(){
alert(new Date().getTime());
$.ajax({
url:"${pageContext.request.contextPath}/CometServlet?time"+new Date().getTime()
});
}
</script>
</html>
$.comet.init("${pageContext.request.contextPath}/cometd/cometd"); //初始化
$.comet.subscribe("/test/task", callback);//订阅名为"/test/task"的主题
这个/test/task与java代码中的
public class DataPushUtil {
public static void publish(HttpServletRequest request,String channelName,String context){
if(null!=request){
Bayeux b = (Bayeux)(request.getSession().getServletContext().getAttribute(Bayeux.DOJOX_COMETD_BAYEUX));
Channel c = b.getChannel(channelName, false);
if(null!=c){
Map<String, Object> message = new HashMap<String, Object>();
message.put("test", "jsp: hello world");
c.publish(b.newClient("server_user", null), message, "new server message");
}
}
}
public static void publishTask(HttpServletRequest request,String context){
if(null!=request){
Bayeux b = (Bayeux)(request.getSession().getServletContext().getAttribute(Bayeux.DOJOX_COMETD_BAYEUX));
Channel c = b.getChannel("/test/task", false);
if(null!=c){
Map<String, Object> message = new HashMap<String, Object>();
message.put("test", context);
c.publish(b.newClient("server_user", null), message, "new server message");
}
}
}
}
Channel c = b.getChannel("/test/task", false);
当后台调用publishTask方法时，就会调用页面的callback方法