我正在编写一个访问REST API http://tåg.info的应用程序。
public class TrainAPI{
private WebTarget webTarget;
private static final String URL = "http://tåg.info";
TrainAPI(){
webTarget = ClientBuilder.newClient().target(URL);
}
public void trainStations(){
ClientResponse response = webTarget.path("/tag.xml").request(MediaType.APPLICATION_JSON).get(ClientResponse.class);
System.out.println(response.getStatus());
}
}
当我调用trainStations（）时，会给出以下堆栈：
Exception in thread "main" javax.ws.rs.ProcessingException: java.net.UnknownHostException: t%C3%A5g.info
at org.glassfish.jersey.client.HttpUrlConnector.apply(HttpUrlConnector.java:244)
at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:254)
at org.glassfish.jersey.client.JerseyInvocation$2.call(JerseyInvocation.java:687)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:444)
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:683)
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:411)
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:307)
at TrainAPI.trainStations(TrainAPI.java:28)
at Main.main(Main.java:8)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.net.UnknownHostException: t%C3%A5g.info
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1168)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1104)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:932)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1512)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at org.glassfish.jersey.client.HttpUrlConnector._apply(HttpUrlConnector.java:335)
at org.glassfish.jersey.client.HttpUrlConnector.apply(HttpUrlConnector.java:242)
... 16 more
由于tåg.info被写成堆栈中的t％C3％A5g.info，我认为这可能是因为我在网址中使用了å。我怎样才能知道这是否真的是UnkownHostException？如果是的话，怎么能解决这个问题呢？
谢谢！ 西蒙