Java 使用SSE在Jersey 2.8中未触发服务器端事件

我尝试使用Jersey SSE官方文档中给出的示例

请参阅以下链接中的“14.5.2.使用EventSource的异步SSE处理”

我的代码如下

客户端代码-

  public class ClientSSEEventManager {
        public void WaitForEvents() {
            // Client client = ClientBuilder.newBuilder()
            // .register(SseFeature.class).build();
            // WebTarget target =
            // client.target("http://localhost:8080/server/events");
            //
            // EventInput eventInput = target.request().get(EventInput.class);
            // while (!eventInput.isClosed()) {
            // final InboundEvent inboundEvent = eventInput.read();
            // if (inboundEvent == null) {
            // // connection has been closed
            // break;
            // }
            // System.out.println(inboundEvent.getName() + "; "
            // + inboundEvent.readData(String.class));
            // }

            Client client = ClientBuilder.newBuilder().register(SseFeature.class)
                    .build();
            WebTarget target = client.target("http://localhost:8080/server/events");
            EventSource eventSource = EventSource.target(target).build();
            EventListener listener = new EventListener() {
                @Override
                public void onEvent(InboundEvent inboundEvent) {
                    System.out.println(inboundEvent.getName() + "; "
                            + inboundEvent.readData(String.class));
                }
            };
            eventSource.register(listener, "message-to-client");
            eventSource.open();
        }
    }

public class MyApplication extends ResourceConfig {
    public MyApplication(){
     super(ClientSSEEventManager.class, SseFeature.class);
    }
//   Set<Class<?>> classes = new HashSet<Class<?>>() {
//          /**
//       * 
//       */
//      private static final long serialVersionUID = 1L;
//
//          { add(ClientSSEEventManager.class);
//          }};
//
//      @Override
//      public Set<Class<?>> getClasses() {
//          return classes;
//      }

}

客户端的Web.xml具有如下init参数

<init-param>
    <param-name>javax.ws.rs.Application</param-name>
    <param-value>com.framework.MyApplication</param-value>
</init-param>

但客户端没有打印任何内容。 我是不是错过了什么？

---

我有一个疑问，client.Target，它应该有“http://:8080/server/events”？或者应该是“http://:8080/events”

SSE最终对我来说运行良好。 我们需要做几件事

春天的春天

  @Singleton
     @Path("/events")
     public class NotificationHandler {
         @Path("/register/{userName}")
     @Produces(SseFeature.SERVER_SENT_EVENTS)
     @GET
     public @ResponseBody EventOutput registerForAnEventSummary(
            @PathParam("userName") String userName) {
        }
     }

调用一个服务，该服务通过调用通知所有客户端

 PostMethod postMethod = null;
        postMethod = new PostMethod(
                resourceBundle.getString("localhost:8080")
                        + resourceBundle.getString("applicationnotifier")
                        + resourceBundle
                                .getString("sse/events/broadcast/"));

广播员

 @Path("/broadcast")
    @POST
     @Produces(MediaType.TEXT_PLAIN)
     @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public String broadcastNotifications(@FormParam("message") String message) { }

Javascript-通过注册来侦听所有SSE事件

 var notificationBaseURL =  ""; //The URL Where your services are hosted
 function listenAllEvents() {
     if ( (EventSource) !== "undefined") {

    var source = new EventSource(
    notificationBaseURL+"applicationnotifier/sse/events/register/"+loggedInUserName);
    source.onmessage = notifyEvent;
} else {
    console.log("Sorry no event data sent - ");
    }
 }

 function notifyEvent(event) {
    var responseJson = JSON.parse(event.data);
    alert("... Notification Received ...");
 }

---

服务器URL取决于应用程序的

上下文路径。如果部署为
服务器
，则路径应为
http://localhost:8080/server/events
。我会在您的服务器端进行一些登录，并将Jackson日志过滤器添加到您的客户端
client.register（new LoggingFilter（LOG，true））以便您可以查看客户端发送/接收的内容。如果我直接在浏览器中打开url，如http:///server/events 然后将调用服务器端getNotificationEvents方法。但是，如果我按照上面代码中所示运行客户端应用程序，则不会调用服务器端getNotificationEvents。好的，查看客户端代码，您正在设置事件处理程序，但从未发出GET请求。@Baldy当我们打开连接时，不是只发出GET请求吗？您能告诉我需要做什么更改吗？同样在上面的示例中，服务器会立即响应客户机，但实际上服务器应该在服务器端发生更改时推送事件。那么服务器如何推送事件呢？我必须为此添加哪些代码？
 PostMethod postMethod = null;
        postMethod = new PostMethod(
                resourceBundle.getString("localhost:8080")
                        + resourceBundle.getString("applicationnotifier")
                        + resourceBundle
                                .getString("sse/events/broadcast/"));

 @Path("/broadcast")
    @POST
     @Produces(MediaType.TEXT_PLAIN)
     @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public String broadcastNotifications(@FormParam("message") String message) { }

 var notificationBaseURL =  ""; //The URL Where your services are hosted
 function listenAllEvents() {
     if ( (EventSource) !== "undefined") {

    var source = new EventSource(
    notificationBaseURL+"applicationnotifier/sse/events/register/"+loggedInUserName);
    source.onmessage = notifyEvent;
} else {
    console.log("Sorry no event data sent - ");
    }
 }

 function notifyEvent(event) {
    var responseJson = JSON.parse(event.data);
    alert("... Notification Received ...");
 }