Android socket编程

      Socket通常也称做”套接字“，用于描述IP地址和端口，它就是网络通信过程中端点的抽象表示。Java在包java.net中提供了两个类Socket和ServerSocket，分别用来表示双向连接的客户端和服务端。

• SocketServer类，服务器实现：

public class SocketServer {
     
     ServerSocket sever;
     
     public SocketServer(int port){
         try{
             sever = new ServerSocket(port);
         }catch(IOException e){
             e.printStackTrace();
         }
     }
     
     public void beginListen(){
         while(true){
             try{
                 final Socket socket = sever.accept();
                 
                 new Thread(new Runnable(){
                     public void run(){
                         BufferedReader in;
                         try{
                             in = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
                             PrintWriter out = new PrintWriter(socket.getOutputStream());
                             while (!socket.isClosed()){
                                 String str;
                                 str = in.readLine();
                                 out.println("Hello!world!! " + str);
                                 out.flush();
                                 if (str == null || str.equals("end"))
                                     break;
                                 System.out.println(str);
                             }
                             socket.close();
                         }catch(IOException e){
                             e.printStackTrace();
                         }
                     }
                 }).start();
             }catch(IOException e){
                 e.printStackTrace();
             }
         }
     }
 }

public class TestSocketServer {
     
     public static void main(String[] argvs){
         SocketServer server = new SocketServer(12345);
         server.beginListen();
     }
 }

客户端实现：

public class SocketClientDemo extends Activity implements Runnable {
    private TextView tv_msg = null;
    private EditText ed_msg = null;
    private Button btn_send = null;
    private static final String HOST = "192.168.1.223";
    private static final int PORT = 12345;
    private Socket socket = null;
    private BufferedReader in = null;
    private PrintWriter out = null;
    private String content = "";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        tv_msg = (TextView) findViewById(R.id.TextView);
        ed_msg = (EditText) findViewById(R.id.EditText01);
        btn_send = (Button) findViewById(R.id.Button01);

        try {
            socket = new Socket(HOST, PORT);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
                    socket.getOutputStream())), true);
        } catch (IOException ex) {
            ex.printStackTrace();
            ShowDialog("login exception" + ex.getMessage());
        }
        btn_send.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String msg = ed_msg.getText().toString();
                if (socket.isConnected()) {
                    if (!socket.isOutputShutdown()) {
                        out.println(msg);
                    }
                }
            }
        });
        new Thread(SocketDemo.this).start();
    }

    public void run() {
        try {
            while (true) {
                if (socket.isConnected()) {
                    if (!socket.isInputShutdown()) {
                        if ((content = in.readLine()) != null) {
                            content += "\n";
                            Log.d("socket","socket:"+content);
                        } else {

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

}

注意在AndroidManifest.xml中加入对网络的访问权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>