java - 如何解决无法连接到/192.168.15.186(端口80): connect failed: ETIMEDOUT (Connection timed out) in Windows Firewall

Question

我正在尝试基于此 tutorial 测试 android studio 与 mysql 的连接。 使用我的 Android 设备而不是 Android 模拟器进行调试。但问题是，它会导致:

java.net.ConnectException:无法连接到/192.168.15.186(端口80):连接失败:ETIMEDOUT(连接超时)

请注意，这是在真实设备上运行的。 localhost 或 127.0.0.1:80 将返回 ECONNREFUSED 结果，因为显然，这是数据库不在设备中的计算机地址但在计算机本身中，所以如果我测试这 2 个或任何替代 IP，那将完全浪费时间。

我已经在模拟器上测试了10.0.2.2:80/login.php，它返回了一个真实的结果，暗示登录和连接成功。

所以我猜测连接可能被Windows防火墙阻止了，但我不知道如何修改它。

LOGCAT

03-06 13:59:29.935 20951-20951/com.example.smdojt.mysqldemo W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err: java.net.ConnectException: failed to connect to /192.168.15.186 (port 80): connect failed: ETIMEDOUT (Connection timed out)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:124)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:513)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.net.Socket.connect(Socket.java:894)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.internal.Platform.connectSocket(Platform.java:174)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.Connection.connect(Connection.java:152)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106)
03-06 14:01:30.744 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:217)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.example.smdojt.mysqldemo.BackgroundWorker.doInBackground(BackgroundWorker.java:48)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at com.example.smdojt.mysqldemo.BackgroundWorker.doInBackground(BackgroundWorker.java:23)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:292)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at java.lang.Thread.run(Thread.java:818)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err: Caused by: android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at libcore.io.Posix.connect(Native Method)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:122)
03-06 14:01:30.745 20951-25612/com.example.smdojt.mysqldemo W/System.err:   ... 18 more
03-06 14:01:30.748 20951-20951/com.example.smdojt.mysqldemo D/wangcy9: setStatusIcon occur wrong theme!
03-06 14:01:30.782 20951-20951/com.example.smdojt.mysqldemo D/ViewRootImpl: loadSystemProperties PersistDebugEvent: false RoDebugEvent: false
03-06 14:02:30.313 20951-20951/com.example.smdojt.mysqldemo W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.

MAINACTIVITY.java

public class MainActivity extends AppCompatActivity {
    EditText UsernameEt, PasswordEt;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        UsernameEt = (EditText) findViewById(R.id.etUserName);
        PasswordEt = (EditText) findViewById(R.id.etPassword);

    }

    public void OnLogin(View view)
    {
        String username = UsernameEt.getText().toString();
        String password = PasswordEt.getText().toString();
        String type = "login";
        BackgroundWorker backgroundWorker = new BackgroundWorker(this);
        backgroundWorker.execute(type, username, password);
    }

}

BACKGROUNDWORKER.java

public class BackgroundWorker extends AsyncTask<String, Void, String> {

    Context context;
    AlertDialog alertDialog;
    BackgroundWorker (Context ctx)
    {
        context = ctx;
    }

    @Override
    protected String doInBackground(String... params) {
        String type = params[0];
        String login_url = "http://192.168.15.186:80/login.php"; //declare want you want to connect with

        if (type.equals("login"))
        {
            try {
                String user_name = params[1];
                String password = params[2];

                URL url = new URL(login_url);
                HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection(); //declare http connection class
                httpURLConnection.setRequestMethod("POST");
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String post_data = URLEncoder.encode("user_name","UTF-8") + "=" +URLEncoder.encode(user_name, "UTF-8")+"&"
                        +URLEncoder.encode("password","UTF-8") + "=" +URLEncoder.encode(password, "UTF-8");
                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                //below: read and get post respone
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
                String result="";
                String line="";

                while ((line = bufferedReader.readLine())!=null)
                {
                    result += line;
                }
                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                return result;
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
            //Clause for httpurlconnection
            catch (IOException e) {
                e.printStackTrace();
            }
        }

        return null;
    }

    @Override
    protected void onPreExecute() {
        alertDialog = new AlertDialog.Builder(context).create();
        alertDialog.setTitle("Login Status");
    }

    @Override
    protected void onPostExecute(String result) {
        alertDialog.setMessage(result);
        alertDialog.show();
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }
}

Answer 1

我今天遇到了同样的问题，我通过让我的电脑在专用网络中可发现来解决它。 使您的电脑可被发现的步骤:

Go to network settings.
>Go to Manage known networks.
>Choose your network.
>Now turn on the PC discoverable feature.

这对我有帮助，希望对你也有帮助。