在特定的浏览器标签上限制@SendToUser广播

问题描述

我在Springboot上使用STOMP websocket,并且想限制广播到特定页面。这是我的过程:

  1. User将消息填充为HTML输入。
  2. 浏览器将通过STOMP客户端发送邮件。
  3. 服务器接收到消息并对其进行验证。如果消息有效,它将向用户处理的所有选项卡广播User已发出消息。如果无效,它将仅将错误消息发送回发送该消息的特定浏览器选项卡,而不与其他选项卡一起发送,即使这些选项卡具有相同的User登录。 / li>

尽管我不能限制将错误消息发送到特定选项卡,但我已经使它的某些部分起作用了,它总是将错误消息广播到共享相同User的所有选项卡。这是我的初始代码:

@MessageMapping("/api/secure/message")
@SendToUser("/api/secure/broadcast")
public HttpEntity createMessage(Message message,Authentication authentication) throws Exception {
    Set<String> errors = TreeSet<String>();
    // Process Message message and add every exceptions encountered to Set errors.
    boolean valid = (errors.size() > 0);
    if(valid) {
        // Broadcast to all.
        return new ResponseEntity(message,HttpStatus.OK);
    }
    else {
        // Send the message to that particular tab only.
        return new ResponseEntity(errors,HttpStatus.UNPROCESSABLE_ENTITY);
    }
}

通过websocket是否可以实现?还是应该回到XHR

解决方法

在每个选项卡中,您都将创建一个新的websocket会话,因此您的stomp session-id也将有所不同。因此,我们可以决定是发送到特定会话还是特定用户的所有会话。

@Autowired
private SimpMessagingTemplate template;
....
@MessageMapping(...)
public void sendMessage(Message<?> message...) {
 .....
 StompHeaderAccessor headerAccessor = 
 StompHeaderAccessor.wrap(message);
 String sessionId = headerAccessor.getSessionId();
 ....
 if(valid) {
   //Not specifying session Id so sends all users of 
    <user_name>
   template.cnvertAndSendToUser(<user_name>,<destination>,<payload>)
 }
 else {
  SimpMessageHeaderAccessor headerAccessor = 
  
  SimpMessagingHeaderAccessor.create(SimpMessageType.MESSAGE);
  headerAccessor.setSessionId(sessionId);

  //This will send it to particular session.
  template.convertAndSendToUser(<user_name>,<payload>,headerAccessor.getMessageHeaders());
  }
}

有用的参考文献:

  1. ITypeInfo::GetTypeAttr method
  2. Medium post on sending to particular session.
,

用户@Srinivas提供了一个很好的起点。我已使用工作代码修改了问题中的代码块:

sudo chmod +x on the folder or file.

如果在控制器方法参数上使用// inject the [messagingTemplate] bean. // class org.springframework.messaging.simp.SimpMessagingTemplate @Autowired private SimpMessagingTemplate messagingTemplate; @MessageMapping("/api/secure/message") // Remove the @SendToUser annotation and change return type to void. // @SendToUser("/api/secure/broadcast") // public HttpEntity createMessage(Message message… public void createMessage(Message message,Authentication authentication) throws Exception { Set<String> errors = TreeSet<String>(); // Process Message message and add every exceptions encountered to Set errors. boolean valid = (errors.size() > 0); if(valid) { // Broadcast to all. // Instead of returning to send the message,use the [messagingTemplate] instead. // return new ResponseEntity(message,HttpStatus.OK); messagingTemplate.convertAndSendToUser("/api/secure/broadcast",errors); } else { // Send the message to that particular tab only. // Each STOMP WebSocket connection has a unique ID that effectively differentiate // it to the other browser tabs. Retrieve that ID so we can target that specific // tab to send our error message with. // class org.springframework.messaging.simp.stomp.StompHeaderAccessor StompHeaderAccessor stompHeaderAccessor = StompHeaderAccessor.wrap(message); String sessionId = stompHeaderAccessor.getSessionId(); // class org.springframework.messaging.simp.SimpMessageHeaderAccessor // class org.springframework.messaging.simp.SimpMessageType // class org.springframework.util.MimeType // class java.nio.charset.StandardCharsets SimpMessageHeaderAccessor simpHeaderAccessor = SimpMessageHeaderAccessor.create(SimpMessageType.MESSAGE); simpHeaderAccessor.setSessionId(sessionId); simpHeaderAccessor.setContentType(new MimeType("application","json",StandardCharsets.UTF_8)); simpHeaderAccessor.setLeaveMutable(true); // Instead of returning to send the message,use the [messagingTemplate] instead. // It will ensure that it will only broadcast the message to the specific // STOMP WebSocket sessionId. // return new ResponseEntity(errors,HttpStatus.UNPROCESSABLE_ENTITY); messagingTemplate.convertAndSendToUser(sessionId,"/api/secure/broadcast",errors,simpHeaderAccessor.getMessageHeaders()); } } ,则必须将逻辑线移至@ResponseBody @Valid ControllerAdvice

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