Question

我正在尝试使用Jersey SSE官方文档中提供的示例示例

参考＆＃34; 14.5.2。使用EventSource＆＃34;进行异步SSE处理在下面的链接 https://jersey.github.io/documentation/2.8/user-guide.html#example-simple-sse

我的代码如下

客户代码 -

  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;
//      }

}

然后在其中一个动作方法中，我只是初始化事件监听如下

//Start listening to event from server
     ClientSSEEventManager clientSSEEventManager = new                      ClientSSEEventManager();
clientSSEEventManager.WaitForEvents();
///

客户端的Web.xml具有init-param，如下所示

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

服务器代码 -

@Path("events")
public class ServerSSEServerEventManager {
    @GET
    @Produces(SseFeature.SERVER_SENT_EVENTS)
    public EventOutput getNotificationEvents(){
         final EventOutput eventOutput = new EventOutput();
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        for (int i = 0; i < 10; i++) {
                            // ... code that waits 1 second
                            final OutboundEvent.Builder eventBuilder
                            = new OutboundEvent.Builder();
                            eventBuilder.name("message-to-client");
                            eventBuilder.data(String.class,
                                "Hello world " + i + "!");
                            final OutboundEvent event = eventBuilder.build();
                            eventOutput.write(event);
                        }
                    } catch (IOException e) {
                        throw new RuntimeException(
                            "Error when writing the event.", e);
                    } finally {
                        try {
                            eventOutput.close();
                        } catch (IOException ioClose) {
                            throw new RuntimeException(
                                "Error when closing the event output.", ioClose);
                        }
                    }
                }
            }).start();
            return eventOutput;
    }
}

客户端的预期输出如下

message-to-client; Hello world 0!
message-to-client; Hello world 1!
message-to-client; Hello world 2!
message-to-client; Hello world 3!
message-to-client; Hello world 4!
message-to-client; Hello world 5!
message-to-client; Hello world 6!
message-to-client; Hello world 7!
message-to-client; Hello world 8!
message-to-client; Hello world 9!

但是在客户端没有打印。我在这里错过了一些东西吗？我有一个疑问，客户端。目标，它应该有＆＃34; http：//：8080 / server / events＆＃34; ？或者它应该只是＆＃34; http：//：8080 / events＆＃34;

Answer 1

SSE终于为我工作了。我们需要做几件事

Springs中的SSE监听器

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

调用拨打电话的服务通知所有客户

 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

收听所有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 ...");
 }

服务器端事件未使用SSE在Jersey 2.8中触发

1 个答案: