依賴

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

也使用了 如果引入不需要引入了

 <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.75</version>
        </dependency>

EndpointConfigure.java

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import javax.websocket.server.ServerEndpointConfig;


 
/**
 */
public class EndpointConfigure extends ServerEndpointConfig.Configurator implements ApplicationContextAware {
    private static volatile BeanFactory context;

    @Override
    public <T> T getEndpointInstance(Class<T> clazz) throws InstantiationException
    {
         return context.getBean(clazz);
    }

    @Override
    
 
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException
    {
        EndpointConfigure.context = applicationContext;
    }
}

WebSocketConfigure.java

import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
@Slf4j
public class WebSocketConfigure {
    @Bean
    public EndpointConfigure newConfigure()
    {
        return new EndpointConfigure();
    }
    
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        log.info("===========開啟WebSocket支援===========");
        return new ServerEndpointExporter();
    }
}

測試demo

IndexWebSocket.java

import com.example.websocket.config.EndpointConfigure;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 *
 * @author yvioo
 */
@ServerEndpoint(value = "/index", configurator = EndpointConfigure.class)
@Component
@Slf4j
public class IndexWebSocket {



    private static Map<String, IndexWebSocket> prototypeMap = new ConcurrentHashMap<>();



    /**
     * 與某個客戶端的連線會話，需要通過它來給客戶端傳送資料
     */
    private Session session;

    /**
     * 可以直接注入，這裡沒有這個類 只是示例
     */
    @Autowired
    private UserMapper userMapper;


    /**
     * 連線建立成功呼叫的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session=session;
        log.info("連線" );

    }

    /**
     * 連線關閉呼叫的方法
     */
    @OnClose
    public void onClose() {

        log.info("退出" );
    }

    /**
     * 收到客戶端訊息
     * @param message 客戶端傳送過來的訊息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("裝置連線" );
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("錯誤: {}", error.getMessage());
    }

    /**
     *伺服器主動推送訊息
     */
    public void sendMessage(String message) {
        synchronized (this.session) {
            try {
                this.session.getBasicRemote().sendText(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }



}