Rumah >Java >javaTutorial >在Java中通过websocket实现消息推送的实现代码详解
这篇文章主要介绍了Java中websocket消息推送的实现代码,非常不错,具有参考借鉴价值,需要的朋友可以参考下
一.服务层
package com.demo.websocket; import java.io.IOException; import java.util.Iterator; import java.util.concurrent.ConcurrentLinkedQueue; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.CloseStatus; import org.springframework.web.socket.TextMessage; import org.springframework.web.socket.WebSocketSession; import org.springframework.web.socket.config.annotation.EnableWebSocket; import org.springframework.web.socket.config.annotation.WebSocketConfigurer; import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry; import org.springframework.web.socket.handler.TextWebSocketHandler; @Configuration @EnableWebSocket public class websocketListener implements WebSocketConfigurer, ServletContextListener{ private ConcurrentLinkedQueue<WebSocketSession> sessions = new ConcurrentLinkedQueue<WebSocketSession>(); private WebSocketHandlerTest handler; @Override public void contextDestroyed(ServletContextEvent arg0) { // TODO Auto-generated method stub } @Override public void contextInitialized(ServletContextEvent arg0) { // TODO Auto-generated method stub } @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { handler = new WebSocketHandlerTest(); registry.addHandler(handler, "/ws/notifymessage.ws"); registry.addHandler(handler, "/ws/sockjs/notifymessage.ws").withSockJS(); new Thread(handler).start(); } class WebSocketHandlerTest extends TextWebSocketHandler implements Runnable{ @Override public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception { sessions.remove(session); } @Override public void afterConnectionEstablished(WebSocketSession session) throws Exception { sessions.add(session); } @Override protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception { super.handleTextMessage(session, message); } @Override public void run() { System.out.println("等待推送...."); try { int i = 0; for (;;) { synchronized (this) { try { Thread.sleep(3000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if(i%10==0){ nofity("消息推送测试......"); System.out.println("推送消息了...."); }else{ System.out.println("本次不推送消息了...."); } i++; } } catch (IOException e) { e.printStackTrace(); System.out.println("失败...."); } } private void nofity(String message) throws IOException { Iterator<WebSocketSession> iterator = sessions.iterator(); while (iterator.hasNext()) { WebSocketSession session = iterator.next(); synchronized(session){ if(session.isOpen()){ session.sendMessage(new TextMessage(message)); }else{ iterator.remove(); } } } } } }
二.前台界面监听
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> websocket测试界面 </body> <script type="text/javascript"> var websocketPath = "localhost:8080/demo-web"; if ('WebSocket' in window) { websocket = new WebSocket("ws://"+websocketPath+"/ws/notifymessage.ws"); } else if ('MozWebSocket' in window) { websocket = new MozWebSocket("ws://"+websocketPath+"/ws/notifymessage.ws"); } else { websocket = new SockJS("ws://"+websocketPath+"/ws/notifymessage.ws"); } websocket.onopen = function (evnt) { }; websocket.onmessage = function (evnt) { console.log(evnt); }; websocket.onerror = function (evnt) { }; websocket.onclose = function (evnt) { } </script> </html>
注意web.xml中配置DispatcherServlet控制器
spring-servlet.xml空文件
<servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>*.ws</url-pattern> </servlet-mapping>
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