在Java项目中使用websocket实现消息推送功能？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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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 sessions = new ConcurrentLinkedQueue();
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 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
Insert title here websocket测试界面
注意web.xml中配置DispatcherServlet控制器
spring-servlet.xml空文件
spring org.springframework.web.servlet.DispatcherServlet contextConfigLocation /WEB-INF/spring-servlet.xml 1 spring *.ws
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