Created
October 16, 2013 13:24
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HTML5 Server-Sent Events + Java Servlet example
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| 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; | |
| public class HelloServlet extends HttpServlet { | |
| public void doGet(HttpServletRequest request, HttpServletResponse response) | |
| throws ServletException, IOException { | |
| response.setContentType("text/event-stream"); | |
| response.setCharacterEncoding("UTF-8"); | |
| PrintWriter writer = response.getWriter(); | |
| for (int i = 0; i < 20; i++) { | |
| writer.write("data: "+ System.currentTimeMillis() +"\n\n"); | |
| writer.flush(); | |
| try { | |
| Thread.sleep(1000); | |
| } catch (InterruptedException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| writer.close(); | |
| } | |
| } |
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <title>Server-Sent Events Servlet example</title> | |
| <style> | |
| body { | |
| font-family: sans-serif; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| Time: <span id="foo"></span> | |
| <br><br> | |
| <button onclick="start()">Start</button> | |
| <script> | |
| function start() { | |
| var eventSource = new EventSource("HelloServlet"); | |
| eventSource.onmessage = function(event) { | |
| document.getElementById('foo').innerHTML = event.data; | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <web-app id="WebApp_ID" version="2.4" | |
| xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> | |
| <display-name>ServerSentEvent_HttpServlet_example</display-name> | |
| <welcome-file-list> | |
| <welcome-file>index.jsp</welcome-file> | |
| </welcome-file-list> | |
| <servlet> | |
| <display-name>HelloServlet</display-name> | |
| <servlet-name>HelloServlet</servlet-name> | |
| <servlet-class>net.viralpatel.servlets.HelloServlet</servlet-class> | |
| </servlet> | |
| <servlet-mapping> | |
| <servlet-name>HelloServlet</servlet-name> | |
| <url-pattern>/HelloServlet</url-pattern> | |
| </servlet-mapping> | |
| </web-app> |
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This just saved me all the time in the world. Thank you!