基于Java API for WebSocket (JSR-356)的标准websocket客户端

maven依赖

springboot

 <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

import xxx.service.CacheService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.websocket.ClientEndpoint;
import javax.websocket.ContainerProvider;
import javax.websocket.DeploymentException;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

/***
 * 查询有多少空闲的worker
 * @author
 */
@ClientEndpoint
@Slf4j
@Component
public class StatusSocketClient {

    private Session session;

    @Value("${ws.asr.status}")
    String statUrl;

    @Autowired
    CacheService cacheService;

    WebSocketContainer container;

    @PostConstruct
    public void init() throws URISyntaxException, IOException, DeploymentException {
        container = ContainerProvider.getWebSocketContainer();
        container.connectToServer(this, new URI(statUrl));
    }

    @PreDestroy
    public void destroy() throws IOException {

        //session.getAsyncRemote().sendText("EOS");
        if(session!= null)
        {
            if(session.isOpen())
            {
                session.close();
            }
        }
    }

    @OnOpen
    public void open(Session session){
        log.info("Connected to Real-Time ASR Server Status Socket...");
        this.session = session;
    }

    @OnMessage
    public void onMessage(String json){
        log.info("Get a status message : " + json);
        cacheService.setCacheValue("asr.server.status",json);
    }

    @OnClose
    public void onClose(){
        log.info("Websocket closed");
    }

    @OnError
    public void onError(Session session, Throwable t) {
        t.printStackTrace();
    }

    public void send(String message){
        this.session.getAsyncRemote().sendText(message);
    }

    public void close() throws IOException {
        if(this.session.isOpen()){
            this.session.close();
        }
    }
}

ws.asr.status:ws://172.16.1.238:8888/client/ws/status

他会从这个地址接收服务器状态信息，并且存redis储缓存