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Multiple Events in Server-Sent Events

2016-06-24 12:26 309 查看

multipleEvents.jsp

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
up_vote:<span id="up"></span><br>
down_vote:<span id="down"></span>
<br><br>
<button onclick="start()">start</button>
<script type="text/javascript">
function start(){
var eventSource = new EventSource("MultiServlet");
/*eventSource.onmessage=function(event){
document.getElementById("foo").innerHTML=event.data;
};*/
eventSource.addEventListener('up_vote',function(event){
document.getElementById("up").innerHTML=event.data;
},false);
eventSource.addEventListener('down_vote',function(event){
document.getElementById("down").innerHTML=event.data;
},false);
}
</script>
</body>
</html>

MultiServlet.java
package net.viralpatel.servlets;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
* Servlet implementation class MultiServlet
*/
public class MultiServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public MultiServlet() {
super();
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/event-stream");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
int upvote=0;
int downvote=0;
for (int i = 0; i < 20; i++) {
upvote=upvote+(int)(Math.random()*10);
downvote=downvote+(int)(Math.random()*10);

//Notice single \n in event and double \n\n in data.
out.write("event:up_vote\n");
out.write("data: " + upvote +"\n\n");

out.write("event:down_vote\n");
out.write("data: " + downvote + "\n\n");

out.flush();

try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
out.close();
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}

}

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