问题描述
我正在尝试通过Spring webSocket在客户端和服务器之间建立连接，而我正在此链接.我希望Controller每5秒向客户端发送一次"hello"，客户端每次将其附加到问候框中.这是控制器类:
I'm trying to make a connection between client and server via Spring webSocket and I'm doing this by the help of this link.I want Controller to send a "hello" to client every 5 seconds and client append it to the greeting box every time.This is the controller class:
@EnableScheduling
@Controller
public class GreetingController {
@Scheduled(fixedRate = 5000)
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting() throws Exception {
Thread.sleep(1000); // simulated delay
System.out.println("scheduled");
return new Greeting("Hello");
}
}
这是app.jsp中的Connect()函数:
and This is Connect() function in app.jsp:
function connect() {
var socket = new SockJS('/gs-guide-websocket');
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.send("/app/hello", {}, JSON.stringify({'name': "connect"}));
stompClient.subscribe('/topic/greetings', function (message) {
console.log("message"+message);
console.log("message"+(JSON.parse(message.body)));
showGreeting(JSON.parse(message.body).content);
});
});
}
当index.jsp加载并且我按下connect按钮时，只有一次它在问候语中打招呼时，我应该如何使客户端每5秒显示一次"hello"消息?
when the index.jsp loads and I press the connect button, only one time it appnds hello in greeting, how should I make client to show "hello" message every 5 seconds?
推荐答案
请参考文档.您尝试发送消息的方式是完全错误的.我将对您的上述课程进行如下修改:
Please reffer to this portion of the documentation.The way you are trying to send a message is totally wrong.I would modify your above class as follows:
@EnableScheduling
@Controller
public class GreetingController {
@Autowired
private SimpMessagingTemplate template;
@Scheduled(fixedRate = 5000)
public void greeting() {
Thread.sleep(1000); // simulated delay
System.out.println("scheduled");
this.template.convertAndSend("/topic/greetings", "Hello");
}
}
这篇关于通过Spring Web-Socket定期向客户端发送消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！