import com.test.www.socket.WebSocketServer;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableScheduling
@ComponentScan("com.test.www")
@MapperScan(value = {"com.test.www.mapper"})
public class Application {
    public static void main(String[] args) {
        SpringApplication springApplication = new SpringApplication(Application.class);
        ConfigurableApplicationContext configurableApplicationContext = springApplication.run(args);
        WebSocketServer.setApplicationContext(configurableApplicationContext);
    }
}
 

三、WebSocketConfig配置類

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}
 

四、WebSocketServer服務端

import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@Component
@ServerEndpoint(value = "/{ip}")
public class WebSocketServer {

    private static Map<String, Session> connections = new HashMap<>();

    private static ApplicationContext applicationContext;

    public static void setApplicationContext(ApplicationContext applicationContext) {
        WebSocketServer.applicationContext = applicationContext;
    }

    /**
     * 開啟連線
     * @param session
     * @param ip
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("ip") String ip) {
        connections.put(ip, session);
    }

    /**
     * 接收訊息
     * @param text
     */
    @OnMessage
    public void onMessage(String text) {

    }

    /**
     * 異常處理
     * @param throwable
     */
    @OnError
    public void onError(Throwable throwable) {
        throwable.printStackTrace();
    }

    /**
     * 關閉連線
     * @param ip
     */
    @OnClose
    public void onClosing(@PathParam("ip") String ip) throws IOException {
        connections.remove(ip);
    }


    /**
     * 根據IP傳送訊息
     * @param ip
     * @param text
     */
    public void send(String ip, String text) {
        try {
            Session session = connections.get(ip);
            if (session != null && session.isOpen()) {
                session.getAsyncRemote().sendText(text);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 遍歷群發訊息
     * @param text
     */
    public void send(String text) {
        for (Map.Entry<String, Session> entry : connections.entrySet()) {
            send(entry.getKey(), text);
        }
    }
}
 

五、SocketClient客戶端類

session.getBasicRemote().sendText()為同步傳送
session.getAsyncRemote().sendText()為非同步傳送
當併發傳送資料的時候避免阻塞，一般都使用非同步

import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.websocket.*;
import java.io.IOException;
import java.net.InetAddress;
import java.net.URI;

@Component
@ClientEndpoint
public class SocketClient {

    // 服務端的IP和埠號
    private static final String URL = "192.168.1.1:8080";

    private Session session;

    @PostConstruct
    void init() {
        try {
            // 本機地址
            String hostAddress = InetAddress.getLocalHost().getHostAddress();
            WebSocketContainer container = ContainerProvider.getWebSocketContainer();
            String wsUrl = "ws://" + URL + "/" + hostAddress;
            URI uri = URI.create(wsUrl);
            session = container.connectToServer(SocketClient.class, uri);
        } catch (DeploymentException | IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 開啟連線
     * @param session
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
    }

    /**
     * 接收訊息
     * @param text
     */
    @OnMessage
    public void onMessage(String text) {

    }

    /**
     * 異常處理
     * @param throwable
     */
    @OnError
    public void onError(Throwable throwable) {
        throwable.printStackTrace();
    }

    /**
     * 關閉連線
     */
    @OnClose
    public void onClosing() throws IOException {
        session.close();
    }

    /**
     * 主動傳送訊息
     */
    public void send(JSONObject json) {
        try {
            session.getAsyncRemote().sendText(json.toJSONString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}