我在将我的Java应用程序连接到SignalR服务器时遇到了问题。
这个服务器非常简单,可以在这里找到:
https://code.msdn.microsoft.com/windowsdesktop/Using-SignalR-in-WinForms-f1ec847b
我可以连接Web客户端(JavaScript)和Windows客户端(C#),但是我在使用我的Java客户端时遇到了问题。(https://github.com/SignalR/java-client)
以下是我的代码:
package javaapplication2;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeoutException;
import microsoft.aspnet.signalr.client.SignalRFuture;
import microsoft.aspnet.signalr.client.hubs.HubConnection;
import microsoft.aspnet.signalr.client.hubs.HubProxy;
public class JavaApplication2 {
public static void main(String[] args) throws IOException, InterruptedException, ExecutionException, TimeoutException
{
String ServerURI = "http://localhost:8080/signalr";
HubConnection Connection = new HubConnection(ServerURI);
HubProxy HubProxy = Connection.createHubProxy("MyHub");
HubProxy.on("AddMessage", () -> { System.out.println("Some message"); });
Connection.error(new ErrorCallback() {
@Override
public void onError(Throwable error) {
error.printStackTrace(); //<==SocketException
}
});
SignalRFuture<Void> con =Connection.start();
con.get();
}
}
更新
当我运行它时,出现“ExecutionException: java.net.SocketException: Connection reset”错误。
Exception in thread "main" java.util.concurrent.ExecutionException: java.net.SocketException: Connection reset
at microsoft.aspnet.signalr.client.SignalRFuture.get(SignalRFuture.java:112)
at microsoft.aspnet.signalr.client.SignalRFuture.get(SignalRFuture.java:102)
at javaapplication2.JavaApplication2.main(JavaApplication2.java:27)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:704)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:647)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:675)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1535)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at microsoft.aspnet.signalr.client.http.java.NetworkRunnable.run(NetworkRunnable.java:72)
at java.lang.Thread.run(Thread.java:745)
-如果我把“localhost”改成不存在的东西(例如locahostX),我会得到一个java.net.UnknownHostException异常。
-如果我把“localhost”改成我的IP,甚至不会有异常……
-所有其他应用程序都可以使用localhost或IP正常工作。
起初我以为这是防火墙问题,但事实并非如此……
显然我漏掉了什么...... 有什么想法吗?
谢谢