java - Jersey 客户端抛出 javax.ws.rs.ProcessingException : java.net.ConnectException : failed to connect to/127. 0.0.1(端口 8080)

Question

我正在使用一个 Android jersey 客户端，该客户端将表单发送到网络服务。我正在得到

javax.ws.rs.ProcessingException: java.net.ConnectException: failed to connect to /127.0.0.1 (port 8080): connect failed: ECONNREFUSED (Connection refused)

我没有配置任何代理。我可以通过 Postman 使用网络服务(浏览器也显示它)。
到目前为止我看到的 SO 帖子都谈到了代理或服务器不活动，这两者在我的情况下都是不真实的。
我用于连接到网络服务的 Android 客户端代码:

public class SignUpAction implements Runnable {
    private Client client;
    private WebTarget webTarget;
    private Form form;   
    private RegistrationBeanInterface rbI;         
    @Override
    public void run() {
        client = JerseyClientBuilder.newClient();
        try {
            webTarget = client.target(new URI("http://127.0.0.1:8080/WebApp/User/Register"));
            form = new Form();

            Response response = webTarget.request(MediaType.APPLICATION_FORM_URLENCODED).post(Entity.form(form)); 
            this.statusCode = response.getStatus();
        } catch (URISyntaxException e) {
            e.getReason();
        }
    }    
    public int getStatusCode(){
        return this.statusCode;
    }
}

这就是我在 Activity 中调用连接类的方式:

signUpAction = signUpAction.createSignUpAction();
executorService.execute(signUpAction);
statusCode = signUpAction.getStatusCode();
if(statusCode == 200){
   Intent intent = new Intent(this, SignInActivity.class);
   startActivity(intent);
}

我对 Jersey 的 Gradle 依赖

implementation 'org.glassfish.hk2.external:javax.inject:2.4.0-b06'    
implementation('org.glassfish.jersey.containers:jersey-container-servlet:2.25.1') {
        exclude module : 'javax.inject'
    }

这是我的堆栈跟踪:

The following warnings have been detected: WARNING: HK2 service reification failed for [org.glassfish.jersey.message.internal.DataSourceProvider] with an exception:
          MultiException stack 1 of 4
          java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: javax.activation.DataSource
              at org.glassfish.hk2.utilities.cache.LRUHybridCache.compute(LRUHybridCache.java:315)
              at org.glassfish.hk2.utilities.reflection.internal.ClassReflectionHelperImpl.getAllMethods(ClassReflectionHelperImpl.java:108)
              at org.jvnet.hk2.internal.Utilities.findInitializerMethods(Utilities.java:1341)
              at org.jvnet.hk2.internal.DefaultClassAnalyzer.getInitializerMethods(DefaultClassAnalyzer.java:107)
              at org.glassfish.jersey.internal.inject.JerseyClassAnalyzer.getInitializerMethods(JerseyClassAnalyzer.java:242)
              at org.jvnet.hk2.internal.Utilities.getInitMethods(Utilities.java:218)
              at org.jvnet.hk2.internal.ClazzCreator.initialize(ClazzCreator.java:145)
              at org.jvnet.hk2.internal.ClazzCreator.initialize(ClazzCreator.java:180)
              at org.jvnet.hk2.internal.SystemDescriptor.internalReify(SystemDescriptor.java:740)
              at org.jvnet.hk2.internal.SystemDescriptor.reify(SystemDescriptor.java:694)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.reifyDescriptor(ServiceLocatorImpl.java:461)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.narrow(ServiceLocatorImpl.java:2288)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.access$1200(ServiceLocatorImpl.java:125)
              at org.jvnet.hk2.internal.ServiceLocatorImpl$9.compute(ServiceLocatorImpl.java:1373)
              at org.jvnet.hk2.internal.ServiceLocatorImpl$9.compute(ServiceLocatorImpl.java:1368)
              at org.glassfish.hk2.utilities.cache.internal.WeakCARCacheImpl.compute(WeakCARCacheImpl.java:116)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetAllServiceHandles(ServiceLocatorImpl.java:1430)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.getAllServiceHandles(ServiceLocatorImpl.java:1355)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.getAllServiceHandles(ServiceLocatorImpl.java:1344)
              at org.glassfish.jersey.internal.inject.Providers.getServiceHandles(Providers.java:354)
              at org.glassfish.jersey.internal.inject.Providers.getCustomProviders(Providers.java:201)
              at org.glassfish.jersey.message.internal.MessageBodyFactory.<init>(MessageBodyFactory.java:221)
              at java.lang.reflect.Constructor.newInstance(Native Method)
              at org.glassfish.hk2.utilities.reflection.ReflectionHelper.makeMe(ReflectionHelper.java:1375)
              at org.jvnet.hk2.internal.ClazzCreator.createMe(ClazzCreator.java:272)
              at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:366)
              at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:487)
              at org.jvnet.hk2.internal.SingletonContext$1.compute(SingletonContext.java:83)
              at org.jvnet.hk2.internal.SingletonContext$1.compute(SingletonContext.java:71)
              at org.glassfish.hk2.utilities.cache.Cache$OriginThreadAwareFuture$1.call(Cache.java:97)
              at java.util.concurrent.FutureTask.run(FutureTask.java:237)
              at org.glassfish.hk2.utilities.cache.Cache$OriginThreadAwareFuture.run(Cache.java:154)
              at org.glassfish.hk2.utilities.cache.Cache.compute(Cache.java:199)
              at org.jvnet.hk2.internal.SingletonContext.findOrCreate(SingletonContext.java:122)
              at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2022)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetService(ServiceLocatorImpl.java:774)
              at org.jvnet.hk2.internal.ServiceLocatorImpl.getUnqualifiedService(ServiceLocatorImpl.java:786)
              at org.jvnet.hk2.internal.IterableProviderImpl.get(IterableProviderImpl.java:111)
              at org.glassfish.jersey.client.RequestProcessingInitializationStage.apply(RequestProcessingInitializationStage.java:97)
              at org.glassfish.jersey.client.RequestProcessingInitializationStage.apply(RequestProcessingInitializationStage.java:67)
              at org.glassfish.jersey.process.internal.Stages$LinkedStage.apply(Stages.java:308)
              at org.glassfish.jersey.process.internal.Stages.process(Stages.java:171)
            at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:25
E/AndroidRuntime: FATAL EXCEPTION: pool-1-thread-1
                  Process: com.stuff.echo01.dummypracticeapplication_01_09_2018, PID: 3677
                  javax.ws.rs.ProcessingException: java.net.ConnectException: failed to connect to /127.0.0.1 (port 8080): connect failed: ECONNREFUSED (Connection refused)
                      at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:287)
                      at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:252)
                      at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:684)
                      at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:681)
                      at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
                      at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
                      at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
                      at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:444)
                      at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:681)
                      at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:437)
                      at org.glassfish.jersey.client.JerseyInvocation$Builder.post(JerseyInvocation.java:343)
                      at com.stuff.echo01.dummypracticeapplication_01_09_2018.authpackage.SignUpAction.run(SignUpAction.java:90)
                      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                      at java.lang.Thread.run(Thread.java:818)
                   Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 8080): connect failed: ECONNREFUSED (Connection refused)
                      at libcore.io.IoBridge.connect(IoBridge.java:124)
                      at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
                      at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)
                      at java.net.Socket.connect(Socket.java:884)
                      at com.android.okhttp.internal.Platform.connectSocket(Platform.java:117)
                      at com.android.okhttp.internal.http.SocketConnector.connectRawSocket(SocketConnector.java:160)
                      at com.android.okhttp.internal.http.SocketConnector.connectCleartext(SocketConnector.java:67)
                      at com.android.okhttp.Connection.connect(Connection.java:152)
                      at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:185)
                      at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:128)
                      at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:341)
                      at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
                      at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
                      at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
                      at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
                      at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:245)
                      at com.android.tools.profiler.support.network.httpurl.TrackedHttpURLConnection.getOutputStream(TrackedHttpURLConnection.java:288)
                      at com.android.tools.profiler.support.network.httpurl.HttpURLConnection$.getOutputStream(HttpURLConnection$.java:212)
                      at org.glassfish.jersey.client.internal.HttpUrlConnector$4.getOutputStream(HttpUrlConnector.java:390)
                      at org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream(CommittingOutputStream.java:200)
                      at org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream(CommittingOutputStream.java:194)
                      at org.glassfish.jersey.message.internal.CommittingOutputStream.write(CommittingOutputStream.java:228)
                      at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$UnCloseableOutputStream.write(WriterInterceptorExecutor.java:299)
                      at java.io.OutputStreamWriter.flushBytes(OutputStreamWriter.java:170)
                      at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:161)
                      at org.glassfish.jersey.message.internal.ReaderWriter.writeToAsString(ReaderWriter.java:193)
                      at org.glassfish.jersey.message.internal.AbstractMessageReaderWriterProvider.writeToAsString(AbstractMessageReaderWriterProvider.java:130)
                    at org.glassfish.jersey.messag  

Answer 1

改变

http://127.0.0.1:8080/WebApp/User/Register

到

http://10.0.2.2:8080/WebApp/User/Register

因为Android模拟器将10.0.2.2(只要您的服务器映射到电脑的本地主机)映射到主机的127.0.0.1。

这是 Google 文档 https://developer.android.com/studio/run/emulator-networking.html