SpringBoot+WebSocket实现实时获取系统数据

• 引入maven依赖

  <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-websocket</artifactId>
          </dependency>
          <dependency>
              <groupId>cn.hutool</groupId>
              <artifactId>hutool-all</artifactId>
              <version>5.7.5</version>
          </dependency>
  
          <dependency>
              <groupId>com.github.ulisesbocchio</groupId>
              <artifactId>jasypt-spring-boot</artifactId>
              <version>2.0.0</version>
          </dependency>
  
  
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-data-redis</artifactId>
              <version>2.1.7.RELEASE</version>
          </dependency>
  
      </dependencies>
  

• 配置websocket

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

• 编写websocket类

  @Component
  @Slf4j
  @ServerEndpoint("/websocket/{userId}")
  @EnableScheduling
  public class WebSocket {
      private Session session;
  
      private String userId;
  
      private static CopyOnWriteArraySet<WebSocket> webSockets =new CopyOnWriteArraySet<>();
  
      private static ConcurrentHashMap<String,Session> sessionPool = new ConcurrentHashMap<String,Session>();
  
  
      @Scheduled(cron = "0/5 * * * * ?")
      private void configureTasks() throws UnknownHostException {
          InetAddress address = InetAddress.getLocalHost();
          String hostAddress = address.getHostAddress();
          System.out.println(hostAddress);
          String action = "http://"+hostAddress+":8011/websocket/sa";
          HttpRequest.get(action)
                  .header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9")
                  .execute().body();
          System.out.println("定时任务");
      }
  
      @OnOpen
      public void onOpen(Session session,@PathParam(value="userId")String userId) {
          try {
  
              this.session = session;
              this.userId = userId;
              webSockets.add(this);
              sessionPool.put(userId, session);
              log.info("【websocket消息】有新的连接，总数为:"+webSockets.size());
          } catch (Exception e) {
  
          }
      }
  
      @OnClose
      public void onClose() {
          try {
              webSockets.remove(this);
              sessionPool.remove(this.userId);
              log.info("【websocket消息】连接断开，总数为:"+webSockets.size());
          } catch (Exception e) {
          }
      }
      /**
       * 收到客户端消息后调用的方法
       *
       * @param message
       */
      @OnMessage
      public void onMessage(String message) {
          log.info("【websocket消息】收到客户端消息:"+message);
      }
  
      /** 发送错误时的处理
       * @param session
       * @param error
       */
      @OnError
      public void one rror(Session session, Throwable error) {
  
          log.error("用户错误,原因:"+error.getMessage());
          error.printStackTrace();
      }
  
      // 此为广播消息
      public void sendAllMessage(String message) {
          log.info("【websocket消息】广播消息:"+message);
          for(WebSocket webSocket : webSockets) {
              try {
                  if(webSocket.session.isOpen()) {
                      webSocket.session.getAsyncRemote().sendText(message);
                  }
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
      }
  
      // 此为单点消息
      public void sendOneMessage(String userId, String message) {
          Session session = sessionPool.get(userId);
          if (session != null&&session.isOpen()) {
              try {
                  log.info("【websocket消息】 单点消息:"+message);
                  session.getAsyncRemote().sendText(message);
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
      }
  
      // 此为单点消息(多人)
      public void sendMoreMessage(String[] userIds, String message) {
          for(String userId:userIds) {
              Session session = sessionPool.get(userId);
              if (session != null&&session.isOpen()) {
                  try {
                      log.info("【websocket消息】 单点消息:"+message);
                      session.getAsyncRemote().sendText(message);
                  } catch (Exception e) {
                      e.printStackTrace();
                  }
              }
          }
      }
  }
  

• 编写controller

  @RestController
  @RequestMapping("/websocket")
  class haoWebSocketController {
  
      @Resource
      private WebSocket webSocket;
  
  
  
      @GetMapping("/{userId}")
      public void aaaa(@PathVariable("userId") String userId){
          OperatingSystemMXBean operatingSystemMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
          File[] files = File.listRoots();
          //System.out.println("系统名称："+operatingSystemMXBean.getName());
          //System.out.println("版本："+operatingSystemMXBean.getVersion());
          //System.out.println("CPU内核："+operatingSystemMXBean.getAvailableProcessors());
          //k->G
          //System.out.println("机器总内存："+Double.valueOf(operatingSystemMXBean.getTotalPhysicalMemorySize())/ 1024 / 1024 / 1024 + "GB");
          //System.out.println("可用内存："+Double.valueOf(operatingSystemMXBean.getFreePhysicalMemorySize())/ 1024 / 1024 / 1024 + "GB");
          DecimalFormat decimalFormat = new DecimalFormat("0.00%");
          String aa = null;
          if (operatingSystemMXBean.getTotalPhysicalMemorySize() > 0) {
              aa = decimalFormat.format(Double.valueOf(operatingSystemMXBean.getFreePhysicalMemorySize()) / operatingSystemMXBean.getTotalPhysicalMemorySize());
              //System.out.println("可用内存占比："+decimalFormat.format(Double.valueOf(operatingSystemMXBean.getFreePhysicalMemorySize()) / operatingSystemMXBean.getTotalPhysicalMemorySize()));
          }
  
          JSONObject obj = new JSONObject();
          obj.put("系统名称", operatingSystemMXBean.getName());//业务类型
          obj.put("版本", operatingSystemMXBean.getVersion());//业务类型
          obj.put("CPU内核", operatingSystemMXBean.getAvailableProcessors());//业务类型
          obj.put("机器总内存", Double.valueOf(operatingSystemMXBean.getTotalPhysicalMemorySize())/ 1024 / 1024 / 1024 + "GB");//业务类型
          obj.put("可用内存", Double.valueOf(operatingSystemMXBean.getFreePhysicalMemorySize())/ 1024 / 1024 / 1024 + "GB");//业务类型
          obj.put("内存占用", aa);//业务类型
          //单个用户发送 (userId为用户id)
          webSocket.sendOneMessage(userId, obj.toJSONString());
      }
  }
  

运行测试