将数据从android传输到java桌面应用程序

Question

我在Android中运行应用程序并将字符串值作为答案。现在我想将这个结果传递给位于本地主机上的Java服务器，即将Android代码的值传递给Java桌面应用程序。

我试过使用这段代码，但是当我运行客户端时，它说不幸应用程序停止了。

它说：

android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145) 
libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
libcore.io.IoBridge.connectErrno(IoBridge.java:127) 

我来自的地方，我需要使用asynctask为它找到。你能指导我如何在这里使用asynctask吗？

IP地址是我的本地主机的IP和端口号是任何随机数。

我尝试运行服务器，然后运行客户端。我甚至尝试在仿真器和实际设备上运行客户端。应用程序关闭。我是Android新手。我做错了什么？

下面是客户端的代码：

package com.example.client; 

    import java.io.IOException; 
    import java.io.PrintWriter; 
    import java.net.Socket; 
    import java.net.UnknownHostException; 


    public class MainActivity extends Activity { 

    private Socket client; 
    private PrintWriter printwriter; 
    private EditText textField; 
    private Button button; 
    private String messsage; 

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

    textField = (EditText) findViewById(R.id.editText1); //reference to the text field 
    button = (Button) findViewById(R.id.button1); //reference to the send button 

    //Button press event listener 
    button.setOnClickListener(new View.OnClickListener() { 

    public void onClick(View v) { 

    messsage = textField.getText().toString(); //get the text message on the text field 
    textField.setText(""); //Reset the text field to blank 

    try { 

    client = new Socket("10.0.2.2", 4444); //connect to server 
    printwriter = new PrintWriter(client.getOutputStream(),true); 
    printwriter.write(messsage); //write the message to output stream 

    printwriter.flush(); 
    printwriter.close(); 
    client.close(); //closing the connection 

    } catch (UnknownHostException e) { 
    e.printStackTrace(); 
    } catch (IOException e) { 
    e.printStackTrace(); 
    } 
    } 
    }); 
    }} 

而这里的服务器的代码：

public class server { 

    private static ServerSocket serverSocket; 
    private static Socket clientSocket; 
    private static InputStreamReader inputStreamReader; 
    private static BufferedReader bufferedReader; 
    private static String message; 

    public static void main(String[] args) { 

    try { 
    serverSocket = new ServerSocket(4444); //Server socket 

    } catch (IOException e) { 
    System.out.println("Could not listen on port: 4444"); 
    } 

    System.out.println("Server started. Listening to the port 4444"); 

    while (true) { 
    try { 

    clientSocket = serverSocket.accept(); //accept the client connection 
    inputStreamReader = new InputStreamReader(clientSocket.getInputStream()); 
    bufferedReader = new BufferedReader(inputStreamReader); //get the client message 
    message = bufferedReader.readLine(); 

    System.out.println(message); 
    inputStreamReader.close(); 
    clientSocket.close(); 

    } catch (IOException ex) { 
    System.out.println("Problem in message reading"); 
    } 
    } 

    } 
    } 

的异步任务代码：

包com.example.client;

public class MainActivity extends Activity { 
    private Socket client; 
    private PrintWriter printwriter; 
    private EditText textField; 
    private Button button; 
    private String messsage; 

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

    textField = (EditText) findViewById(R.id.editText1); //reference to the text field 
    button = (Button) findViewById(R.id.button1); //reference to the send button 

    //Button press event listener 
    button.setOnClickListener(new View.OnClickListener() { 

    public void onClick(View v) { 

    messsage = textField.getText().toString(); //get the text message on the text field 
    textField.setText("");  //Reset the text field to blank 

    try { 

    client = new Socket("134.190.162.165", 44440); //connect to server 
    printwriter = new PrintWriter(client.getOutputStream(),true); 
    printwriter.write(messsage); //write the message to output stream 

    printwriter.flush(); 
    printwriter.close(); 
    client.close(); //closing the connection 

    } catch (UnknownHostException e) { 
    e.printStackTrace(); 
    } catch (IOException e) { 
    e.printStackTrace(); 
    } 
    } 
    }); 

    } 


} 

Answer 1

使用该PC端获取其IP：

String IPfromPC = InetAddress.getLocalHost().getHostAddress(); 

使用IP在您的Andoid应用：

mSocket.connect(new InetSocketAddress(IPfromPC, 4444), 5000);