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：

[java]  view plain copy print ?

1. public class SocketServer {  
2.        
3.      ServerSocket sever;  
4.        
5.      public SocketServer(int port){  
6.          try{  
7.              sever = new ServerSocket(port);  
8.          }catch(IOException e){  
9.              e.printStackTrace();  
10.          }  
11.      }  
12.        
13.      public void beginListen(){  
14.          while(true){  
15.              try{  
16.                  final Socket socket = sever.accept();  
17.                    
18.                  new Thread(new Runnable(){  
19.                      public void run(){  
20.                          BufferedReader in;  
21.                          try{  
22.                              in = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));  
23.                              PrintWriter out = new PrintWriter(socket.getOutputStream());  
24.                              while (!socket.isClosed()){  
25.                                  String str;  
26.                                  str = in.readLine();  
27.                                  out.println("Hello!world!! " + str);  
28.                                  out.flush();  
29.                                  if (str == null || str.equals("end"))  
30.                                      break;  
31.                                  System.out.println(str);  
32.                              }  
33.                              socket.close();  
34.                          }catch(IOException e){  
35.                              e.printStackTrace();  
36.                          }  
37.                      }  
38.                  }).start();  
39.              }catch(IOException e){  
40.                  e.printStackTrace();  
41.              }  
42.          }  
43.      }  
44.  }  

[java]  view plain copy print ?

1. public class TestSocketServer {  
2.        
3.      public static void main(String[] argvs){  
4.          SocketServer server = new SocketServer(12345);  
5.          server.beginListen();  
6.      }  
7.  }  

客户端实现：

[java]  view plain copy print ?

1. public class SocketClientDemo extends Activity implements Runnable {  
2.     private TextView tv_msg = null;  
3.     private EditText ed_msg = null;  
4.     private Button btn_send = null;  
5.     private static final String HOST = "192.168.1.223";  
6.     private static final int PORT = 12345;  
7.     private Socket socket = null;  
8.     private BufferedReader in = null;  
9.     private PrintWriter out = null;  
10.     private String content = "";  
11.   
12.     /** Called when the activity is first created. */  
13.     @Override  
14.     public void onCreate(Bundle savedInstanceState) {  
15.         super.onCreate(savedInstanceState);  
16.         setContentView(R.layout.main);  
17.   
18.         tv_msg = (TextView) findViewById(R.id.TextView);  
19.         ed_msg = (EditText) findViewById(R.id.EditText01);  
20.         btn_send = (Button) findViewById(R.id.Button01);  
21.   
22.         try {  
23.             socket = new Socket(HOST, PORT);  
24.             in = new BufferedReader(new InputStreamReader(socket.getInputStream()));  
25.             out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(  
26.                     socket.getOutputStream())), true);  
27.         } catch (IOException ex) {  
28.             ex.printStackTrace();  
29.             ShowDialog("login exception" + ex.getMessage());  
30.         }  
31.         btn_send.setOnClickListener(new Button.OnClickListener() {  
32.   
33.             @Override  
34.             public void onClick(View v) {  
35.                 // TODO Auto-generated method stub  
36.                 String msg = ed_msg.getText().toString();  
37.                 if (socket.isConnected()) {  
38.                     if (!socket.isOutputShutdown()) {  
39.                         out.println(msg);  
40.                     }  
41.                 }  
42.             }  
43.         });  
44.         new Thread(SocketDemo.this).start();  
45.     }  
46.   
47.     public void run() {  
48.         try {  
49.             while (true) {  
50.                 if (socket.isConnected()) {  
51.                     if (!socket.isInputShutdown()) {  
52.                         if ((content = in.readLine()) != null) {  
53.                             content += "\n";  
54.                             Log.d("socket","socket:"+content);  
55.                         } else {  
56.   
57.                         }  
58.                     }  
59.                 }  
60.             }  
61.         } catch (Exception e) {  
62.             e.printStackTrace();  
63.         }  
64.     }  
65.   
66. }  

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>