Android socket编程

原文地址：http://blog.csdn.net/xyz_lmn/article/details/8291404

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>