java.net.ConnectException：无法连接到 /10.0.0.2（端口 80）：连接失败：ETIMEDOUT（连接超时）

Posted 2023-02-25

【中文标题】java.net.ConnectException：无法连接到 /10.0.0.2（端口 80）：连接失败：ETIMEDOUT（连接超时）

【英文标题】：java.net.ConnectException: failed to connect to /10.0.0.2 (port 80): connect failed: ETIMEDOUT (Connection timed out)

【发布时间】：2016-01-02 10:22:30

【问题描述】：

尝试从我的笔记本电脑上运行的 XAMPP 服务器获取 JSON 数据，这只是一个测试应用程序，没有重要数据，我有一个主要活动，一个 HttpManager 用于获取数据的类，一个 UserdataJson我用来解析数据，我有一个UserData POJO，代码如下。

主活动：

public class MainActivity extends AppCompatActivity 
    TextView output;
    ProgressBar pb;
    Button btn;
    List<UserData> userDataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        output=(TextView) findViewById(R.id.textView);
        output.setMovementMethod(new ScrollingMovementMethod());
        pb= (ProgressBar) findViewById(R.id.progressBar);
        pb.setVisibility(View.INVISIBLE);
        btn= (Button) findViewById(R.id.button);
        onClicked();

    

    public void onClicked()
        btn.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                if (isOnline()) 
                    requestData("http://10.0.0.2/database/getInfoDroid.php");
                 else 
                    Toast.makeText(MainActivity.this, "Network Unavailable", Toast.LENGTH_LONG).show();
                

            
        );
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 


        int id = item.getItemId();


        if (id == R.id.action_settings) 

        

        return super.onOptionsItemSelected(item);
    

    private void requestData(String uri) 
        MyTask task=new MyTask();
        task.execute(uri);
    

    protected void updateDisplay()
        if (userDataList!=null)
        
            for (UserData userdata:userDataList
                 ) 
                output.append(userdata.getName() + "\n");


            
        


    

    protected boolean isOnline()
        ConnectivityManager cm= (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
        NetworkInfo netinfo= cm.getActiveNetworkInfo();
        if(netinfo!= null && netinfo.isConnectedOrConnecting())
            return true;
        
        else 
            return false;
        



    


    private class MyTask extends AsyncTask 

        @Override
        protected void onPreExecute() 
           // updateDisplay("Background Task Started");
            pb.setVisibility(View.VISIBLE);
        


        @Override
        protected Object doInBackground(Object[] objects) 

            String content =HttpManager.getData(objects[0].toString());
            return content;


        

        @Override
        protected void onPostExecute(Object o) 



            userDataList= UserDataJsonParser.parseFeed(o.toString());
            updateDisplay();
            pb.setVisibility(View.INVISIBLE);
        


        @Override
        protected void onProgressUpdate(Object[] values) 
            //updateDisplay(values[0].toString());
        
    

HttpManager：

public class HttpManager 


    public static String getData(String uri)
        StringBuilder sb=new StringBuilder();


        BufferedReader reader=null;
        try 
            URL url=new URL(uri);
            HttpURLConnection con= (HttpURLConnection) url.openConnection();
            reader=new BufferedReader(new InputStreamReader(con.getInputStream()));

            String line;
            while ((line=reader.readLine())!=null)
                sb.append(line+ "\n");

            
            return sb.toString();

        
       catch (MalformedURLException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
        
        finally 
            if (reader!=null)
                try 
                    reader.close();
                 catch (IOException e) 
                    e.printStackTrace();
                
            
        
      return sb.toString();
    

JsonParser 类：

public class UserDataJsonParser 
    public static List<UserData> parseFeed(String content)
        System.out.println(content);
        try 
            JSONArray array = new JSONArray(content);


            List<UserData> dataList= new ArrayList<>();
            JSONObject obj=null;

            for (int i=0;i<array.length();i++) 

                obj = array.getJSONObject(i);


                UserData userData = new UserData();
                userData.setId(obj.getInt("id"));
                userData.setName(obj.getString("name"));
                userData.setSurname(obj.getString("surname"));
                userData.setUsername(obj.getString("username"));
                userData.setPassword(obj.getString("password"));

                dataList.add(userData);

            
            return dataList;
         catch (JSONException e) 
            e.printStackTrace();
            return null;
        

    

正在尝试解析的 JSON 数据：

["id":"1","name":"Hilary","surname":"Mwape","username":"Hilz","password":"milan","id":"2","name":"John","surname":"Kalyondo","username":"jk","password":"jk92","id":"3","name":"Sipiwe","surname":"Tembo","username":"ST","password":"ST91"] 

LOGCAT：

java.net.ConnectException: failed to connect to /10.0.0.2 (port 80): connect failed: ETIMEDOUT (Connection timed out)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:124)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at java.net.Socket.connect(Socket.java:884)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.Platform.connectSocket(Platform.java:117)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.http.SocketConnector.connectRawSocket(SocketConnector.java:160)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.http.SocketConnector.connectCleartext(SocketConnector.java:67)
10-05 17:19:38.770 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.Connection.connect(Connection.java:152)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:185)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:128)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:341)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:384)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at hilz.myapplication.HttpManager.getData(HttpManager.java:22)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at hilz.myapplication.MainActivity$MyTask.doInBackground(MainActivity.java:122)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
10-05 17:19:38.771 12022-14516/hilz.myapplication W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at java.lang.Thread.run(Thread.java:818)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err: Caused by: android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at libcore.io.Posix.connect(Native Method)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
10-05 17:19:38.772 12022-14516/hilz.myapplication W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:122)
10-05 17:19:38.773 12022-14516/hilz.myapplication W/System.err:     ... 23 more
10-05 17:19:38.810 12022-12022/hilz.myapplication W/System.err: org.json.JSONException: End of input at character 0 of 
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at org.json.JSONTokener.syntaxError(JSONTokener.java:449)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at org.json.JSONTokener.nextValue(JSONTokener.java:97)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at org.json.JSONArray.<init>(JSONArray.java:92)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at org.json.JSONArray.<init>(JSONArray.java:108)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at hilz.myapplication.UserDataJsonParser.parseFeed(UserDataJsonParser.java:15)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at hilz.myapplication.MainActivity$MyTask.onPostExecute(MainActivity.java:133)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at android.os.AsyncTask.finish(AsyncTask.java:651)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at android.os.AsyncTask.-wrap1(AsyncTask.java)
10-05 17:19:38.811 12022-12022/hilz.myapplication W/System.err:     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
10-05 17:19:38.812 12022-12022/hilz.myapplication W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
10-05 17:19:38.812 12022-12022/hilz.myapplication W/System.err:     at android.os.Looper.loop(Looper.java:148)
10-05 17:19:38.812 12022-12022/hilz.myapplication W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5417)
10-05 17:19:38.812 12022-12022/hilz.myapplication W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
10-05 17:19:38.812 12022-12022/hilz.myapplication W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
10-05 17:19:38.812 12022-12022/hilz.myapplication W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
10-05 19:04:43.849 12022-12030/? I/art: Ignoring second debugger -- accepting and dropping

【问题讨论】：

你的 logcat 说有一个超时错误。您的应用无法连接到服务器。您确定服务器正在运行并且您使用的是正确的 url 和端口号吗？

Server is Running am Sure url is correct 端口号与其说是初学者

你能检查一下这个命令的输出吗：telnet 10.0.0.2 80

【参考方案1】：

终于找到了解决方案，每个人都说使用 10.0.0.2 但这在我的 URL 中给出了上述错误，但使用我的 PC 实际 ip n 就像一个魅力