springboot 2.0 配置websocket

maven:

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

WebSocketConfig:

package com.example.alarmdatagenerator.websocket;

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

/**
 * 開啓WebSocket支持
 * @author zhengkai
 */
@Configuration
public class WebSocketConfig {  
   
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }  
  
} 

 

WebSocketServer:

package com.example.alarmdatagenerator.websocket;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

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

@ServerEndpoint("/sockjs/test")
@Component
@Slf4j
public class WebSocketServer {

    //靜態變量，用來記錄當前在線連接數。應該把它設計成線程安全的。
    private static int onlineCount = 0;
    //concurrent包的線程安全Set，用來存放每個客戶端對應的MyWebSocket對象。
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    //與某個客戶端的連接會話，需要通過它來給客戶端發送數據
    private Session session;

    //接收sid
    private String sid="";
    /**
     * 連接建立成功調用的方法*/
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);     //加入set中
        try {
            sendMessage("連接成功");
        } catch (IOException e) {
            log.error("websocket IO異常");
        }
    }

    /**
     * 連接關閉調用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //從set中刪除
    }

    /**
     * 收到客戶端消息後調用的方法
     *
     * @param message 客戶端發送過來的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
       log.info("收到來自窗口"+sid+"的信息:"+message);
        //羣發消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

   /**
    * 
    * @param session
    * @param error
    */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("發生錯誤");
        error.printStackTrace();
    }
   /**
    * 實現服務器主動推送
    */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 羣發自定義消息
     * */
    public static void sendInfo(String message,String sid) throws IOException {
       log.info("推送消息到窗口"+sid+"，推送內容:"+message);
        for (WebSocketServer item : webSocketSet) {
            try {
               //這裏可以設定只推送給這個sid的，爲null則全部推送
               if(sid==null) {
                  item.sendMessage(message);
               }else if(item.sid.equals(sid)){
                  item.sendMessage(message);
               }
            } catch (IOException e) {
                log.error(e.getMessage(), e);
                continue;
            }
        }
    }

}