Question

我有一个使用visual studio构建的api，当我运行它时，它运行IIS Express。我还有一个Android应用程序，我使用Android Studio构建。 Android应用程序用于访问api并返回JSON响应，但我获得了权限被拒绝的异常。

java.net.SocketException: Permission denied

我的Android代码是：

public class MainActivity extends AppCompatActivity {

    Button btnGET;
    final String API = "http://localhost:1337/Test/b";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnGET = (Button) findViewById(R.id.btnGET);
        btnGET.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new DoGetTestTable().execute();
            }
        });
    }

    class DoGetTestTable extends AsyncTask<Void, Void, Void>{

        @Override
        protected Void doInBackground(Void... params) {
            try{
                URL url = new URL(API);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setRequestMethod("GET");
                httpURLConnection.connect();
                InputStream is = httpURLConnection.getInputStream();

                int byteCharacter;
                String result = "";

                while((byteCharacter = is.read()) != -1){
                    result += (char) byteCharacter;
                }

                Log.d("json api", result);

            } catch (Exception e){
                e.printStackTrace();
            }

            return null;
        }
    }
}

我的追踪是：

07-01 22:59:31.736 2429-2846/sentzke.jackson.apitest W/System.err: java.net.SocketException: Permission denied
07-01 22:59:31.736 2429-2846/sentzke.jackson.apitest W/System.err:     at java.net.Socket.createImpl(Socket.java:454)
07-01 22:59:31.736 2429-2846/sentzke.jackson.apitest W/System.err:     at java.net.Socket.getImpl(Socket.java:517)
07-01 22:59:31.736 2429-2846/sentzke.jackson.apitest W/System.err:     at java.net.Socket.setSoTimeout(Socket.java:1108)
07-01 22:59:31.736 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.Connection.connectSocket(Connection.java:195)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.Connection.connect(Connection.java:172)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:367)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:130)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:329)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:246)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:126)
07-01 22:59:31.737 2429-2846/sentzke.jackson.apitest W/System.err:     at sentzke.jackson.apitest.MainActivity$DoGetTestTable.doInBackground(MainActivity.java:42)
07-01 22:59:31.738 2429-2846/sentzke.jackson.apitest W/System.err:     at sentzke.jackson.apitest.MainActivity$DoGetTestTable.doInBackground(MainActivity.java:34)
07-01 22:59:31.738 2429-2846/sentzke.jackson.apitest W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:304)
07-01 22:59:31.738 2429-2846/sentzke.jackson.apitest W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
07-01 22:59:31.738 2429-2846/sentzke.jackson.apitest W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
07-01 22:59:31.739 2429-2846/sentzke.jackson.apitest W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
07-01 22:59:31.739 2429-2846/sentzke.jackson.apitest W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
07-01 22:59:31.739 2429-2846/sentzke.jackson.apitest W/System.err:     at java.lang.Thread.run(Thread.java:761)

我已尝试将本地主机更改为10.0.2.2:1337，但这也无效。有什么建议吗？

Answer 1

在Android上当然应该使用10.0.2.2:1337，但在IIS Express方面也需要进行更改，将主机名从“localhost”更改为“127.0.0.1”，或者为空。

<binding protocol="http" bindingInformation="*:7265:127.0.0.1" />

您可以在我的博文中找到所有详细信息，

https://blog.lextudio.com/how-to-let-android-emulator-access-iis-express-f6530a02b1d3

Android Emulator访问IIS Express

1 个答案: