服务器发送的事件客户端在Java项目中不起作用

Question

我正试图从这个tutorial在java中实现SSE客户端。 当使用post方法实现为Servlet客户端时，它工作正常。但是当我在Java项目中使用main方法和servlet中使用相同的jar文件实现相同时，它不起作用。这是我和目标URI一起使用的代码： -

import javax.ws.rs.Consumes;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;

import org.glassfish.jersey.media.sse.EventListener;
import org.glassfish.jersey.media.sse.EventSource;
import org.glassfish.jersey.media.sse.InboundEvent;
import org.glassfish.jersey.media.sse.SseFeature;


public class SSEreceive {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    try {
      Client client = ClientBuilder.newBuilder().register(SseFeature.class).build();



      WebTarget target =   ((Client)client).target("http://www.w3schools.com/html/demo_sse.php");



      EventSource eventSource = (EventSource)EventSource.target(target).build();

      EventListener listener = new EventListener() {
        @Override
        //@Consumes(MediaType.APPLICATION_JSON)
        public void onEvent(InboundEvent inboundEvent) {
          //  System.out.println(inboundEvent.getName() + "; " + inboundEvent.readData(String.class));  
          System.out.println(inboundEvent.readData(String.class));
        }
      };

      //eventSource.register(listener, "message-to-client");

      eventSource.register(listener);
      eventSource.open();
      System.out.println("Connection tried");
      eventSource.close();

    } catch (ProcessingException pe) {
      pe.printStackTrace();
      System.out.println(pe.getMessage());
    } catch (Exception e) {
      e.printStackTrace();
      System.out.println(e.getMessage());
    }
  }
}

有些人可以帮助我，为什么这在Java项目中不起作用？