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Detailed explanation of the implementation code for message push through websocket in Java

黄舟Original: 2017-03-25 09:57:103680browse

This article mainly introduces the implementation code of websocket message push in Java. It is very good and has reference value. Friends in need can refer to it

1. Service layer

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();
          }
        }
      }
    }
  }
}

2. Front-end interface monitoring

<!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 (&#39;WebSocket&#39; in window) {
  websocket = new WebSocket("ws://"+websocketPath+"/ws/notifymessage.ws");
} else if (&#39;MozWebSocket&#39; 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>

Note that the DispatcherServlet controller is configured in web.xml

spring-servlet.xml is empty File

<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>

The above is the detailed explanation of the implementation code of websocket message push in Java. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

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