Question

我正在尝试使用Jersey 2.5.1实现Server-Sent-Events客户端（无法升级到更高版本），并且连接一直关闭，没有事件被读取。我已经将代码缩减为我认为可能来自manual的最简单的代码，但没有成功。

我已经针对其他服务器测试了我的客户端，行为是一样的，所以我认为我的问题是基于客户端的。客户端连接到资源，服务器开始发送事件。但是没有收到任何事件，并且连接过早关闭。

我也尝试使用EventSource而不是EventInput，但结果是一样的。有人可以告诉我我错过了什么吗？感谢。

服务器代码：

@Path("events")
public class SseResource {

  /**
   * Create stream.
   * @return chunkedOutput of events.
   */
  @GET
  @Produces(SseFeature.SERVER_SENT_EVENTS)
  public EventOutput getServerSentEvents() {
    System.out.println("Received GetEvent");
    final EventOutput eventOutput = new EventOutput();
    new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          for (int i = 0; i < 10; i++) {

            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);
            System.out.println("Wrote event " + i);

            // ... code that waits 1 second
            try {
              TimeUnit.MILLISECONDS.sleep(10);
            } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
            }

          }
        } catch (IOException e) {
          System.out.println("Error when writing the event" + e);
          throw new RuntimeException("Error when writing the event.", e);
        } finally {
          try {
            eventOutput.close();
          } catch (IOException ioClose) {
            System.out.println("Error when closing the eventOuput" + ioClose);
            throw new RuntimeException("Error when closing the event output.", ioClose);
          }
        }
      }
    }).start();
    return eventOutput;
  }
}

客户代码：

import org.glassfish.jersey.media.sse.EventInput;
import org.glassfish.jersey.media.sse.InboundEvent;
import org.glassfish.jersey.media.sse.SseFeature;
...
  public final void simpleClientTest() {
    final Client client = ClientBuilder.newBuilder().register(SseFeature.class).build();
    final WebTarget target = client.target("http://localhost:8182/events");

    final 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));
    }
    System.out.println("eventInput finished");
  }

Answer 1

我终于找到了问题的原因。服务器启动代码（上面未给出）不包含SseFeature.class资源。在这里包括其他人有这个问题......

  public void startServer() throws IOException {
    final URI baseUri = UriBuilder.fromUri("http://0.0.0.0").port(serverPort).build();
    System.out.println("Starting media server at: " + baseUri);
    final ResourceConfig config = new ResourceConfig(SseResource.class, SseFeature.class);
    server = GrizzlyHttpServerFactory.createHttpServer(baseUri, config);
  }

泽西岛SSE客户端未收到任何活动

1 个答案: