Retrofit无法连接到端口3000上的本地Web服务器

Question

我的使用Retrofit(v1.6.1)连接到REST Web服务的应用程序无法连接到我的本地Web服务器(正在运行localhost),这是我得到的错误.

这是在Nexus4(v4.3)模拟器中,我使用Android Studio进行开发,我在清单文件中添加了android.permission.INTERNET&android.permission.ACCESS_NETWORK_STATE权限.

错误说它等了15秒,但它没有,它立即出错.

07-13 15:57:53.947      820-840/it.test.android.app.activity D/Retrofit? ---> HTTP POST http://localhost:3000/app/auth/signin
07-13 15:57:54.132      820-840/it.test.android.app.activity D/Retrofit? Content-Type: application/json; charset=UTF-8
07-13 15:57:54.132      820-840/it.test.android.app.activity D/Retrofit? Content-Length: 44
07-13 15:57:54.157      820-840/it.test.android.app.activity D/Retrofit? {"auth":{"email":"steve","password":"pass"}}
07-13 15:57:54.387      820-840/it.test.android.app.activity D/Retrofit? ---> END HTTP (44-byte body)
07-13 15:57:54.657      820-840/it.test.android.app.activity D/Retrofit? ---- ERROR http://localhost:3000/app/auth/signin
07-13 15:57:54.857      820-840/it.test.android.app.activity D/Retrofit? java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 3000) after 15000ms: isConnected failed: ECONNREFUSED (Connection refused)
            at libcore.io.IoBridge.isConnected(IoBridge.java:223)
            at libcore.io.IoBridge.connectErrno(IoBridge.java:161)
            at libcore.io.IoBridge.connect(IoBridge.java:112)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
            at java.net.Socket.connect(Socket.java:842)
            at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)
            at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
            at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
            at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
            at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
            at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
            at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
            at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
            at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
            at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
            at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:197)
            at retrofit.client.UrlConnectionClient.prepareRequest(UrlConnectionClient.java:68)
            at retrofit.client.UrlConnectionClient.execute(UrlConnectionClient.java:37)
            at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:321)
            at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
            at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
            at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
            at retrofit.Platform$Android$2$1.run(Platform.java:142)
            at java.lang.Thread.run(Thread.java:841)
     Caused by: libcore.io.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)
            at libcore.io.IoBridge.isConnected(IoBridge.java:208)
            at libcore.io.IoBridge.connectErrno(IoBridge.java:161)
            at libcore.io.IoBridge.connect(IoBridge.java:112)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
            at java.net.Socket.connect(Socket.java:842)
            at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)
            at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
            at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
            at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
            at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
            at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
            at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
            at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
            at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
            at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
            at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:197)
            at retrofit.client.UrlConnectionClient.prepareRequest(UrlConnectionClient.java:68)
            at retrofit.client.UrlConnectionClient.execute(UrlConnectionClient.java:37)
            at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:321)
            at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
            at retrofit.RestAdapter$RestHandler$2.obtainResponse(RestAdapter.java:278)
            at retrofit.CallbackRunnable.run(CallbackRunnable.java:42)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
            at retrofit.Platform$Android$2$1.run(Platform.java:142)
            at java.lang.Thread.run(Thread.java:841)
07-13 15:57:54.857      820-840/it.test.android.app.activity D/Retrofit? ---- END ERROR

Answer 1

在手机连接上localhost:3000意味着"连接到本地网络接口上的端口3000" - 这是手机的本地接口,而不是手机所连接的PC的端口3000.手机上的端口3000没有任何监听,因此您会收到连接拒绝错误.

你想要做的是(可能很难猜到没有更多的信息)是从手机连接到你的PC上的端口3000.因此,您应该将要连接的地址更改localhost为PC的地址.如果模拟器是10.0.2.2(它是PC的localhost).请参阅网络信息以供参考.

Answer 2

我解决了这个问题,需要使用10.0.2.2而不是localhost连接到我的本地服务器.

在这里找到它 - http://developer.android.com/tools/devices/emulator.html#networkaddresses