android socket 简单示例

下面的例子只是一个简单通讯过程,当然商用的实际情况要复杂的多,但是对于理解java中socket的使用还是有一定帮助的,本人正打算在android中实现异步的服务器与客户端,完成后将发布到个人随笔

首先添加权限

在manifest.xml里授权如下<uses-permission android:name="android.permission.INTERNET" />

一   Android 与PC 通讯:

• PC : Java Server
• Android :Java Client

Java Server 源代码：

public class PCSERVER implements Runnable {

 

    public static final String PCIP = "192.168.0.254" ;

    public static final int PCPORT = 55555;

 

    public void run() {

       try {

           System. out .println( "connecting......." );

 

           ServerSocket serverSocket = new ServerSocket( PCPORT );

           // 不断获取与客户端的连接（允许与多个客户端进行连接）

 

           while ( true ) {

              // 获取与一个客户端的连接

              Socket client = serverSocket.accept();

              System. out .println( "S: Receiving..." );

 

              try {

                  // 获取与某个连接上的客户端的输入流

                  BufferedReader in = new BufferedReader(

                         new InputStreamReader(client.getInputStream()));

                  String clientConent = in.readLine();

                 

                  // 打印出服务端接收的客户端的信息

                  System. out .println( "Client:  " + clientConent );

              } catch (Exception e) {

                  System. out .println( "Server Receive: Error" );

                  e.printStackTrace();

              } finally {

                  client.close();

                  System. out .println( "Server Receive: Done." );

              }

 

           }

 

       } catch (Exception e) {

           System. out .println( "S: Error" );

           e.printStackTrace();

       }

    }

 

    public static void main(String a[]) {

       Thread desktopServerThread = new Thread( new PCSERVER());

       desktopServerThread.start();

    }

}

对上边的源代码做一些介绍： 
指定Server 监听的端口和服务器IP 地址。

1	public static final String PCIP = "192.168.0.254";
2	public static final int PCPORT = 55555;

应用之前所指定的IP 和Port 创建一个ServerSocket 对象。

1	ServerSocket serverSocket = new ServerSocket(PCPORT);

用于侦听和捕捉通过Socket 连接的客户端。

1	Socket client = serverSocket.accept();

应用Socket 创建 BufferedReader 对象 , 用于接收Socket Stream 中的数据。

1	BufferedReader in = new BufferedReader(newInputStreamReader(client.getInputStream()));

Android Client 源代码：

public class ClientActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

       // TODO Auto-generated method stub

       super .onCreate(savedInstanceState);

       InetAddress serverAddr;

       Socket socket = null ;

       String message = "" ;

       try {

           serverAddr = InetAddress.getByName ( "192.168.0.254" );

           Log.d ( "TCP" , "C: Connecting..." );

          

           // 与服务器获取连接

           socket = new Socket(serverAddr, 55555);

           message = "Hello eoeandroid !" ;

       } catch (UnknownHostException e1) {

           // TODO Auto-generated catch block

           e1.printStackTrace();

       } // TCPServer.SERVERIP

       catch (IOException e) {

           // TODO Auto-generated catch block

           e.printStackTrace();

       }

      

       try {

           Log.d ( "TCP" , "C: Sending: '" + message + "'" );

          

           // 获取 Client 端的输出流

           PrintWriter out = new PrintWriter( new BufferedWriter(

                  new OutputStreamWriter(socket.getOutputStream())), true );

           out.println(message);

        } catch (Exception e) {

           Log.e ( "TCP" , "S: Error" , e);

       } finally {

           try {

              socket.close();

           } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

           }

       }

 

    }

}

对上边的源代码做一些介绍： 
指定Server 的IP 地址。

1	InetAddress serverAddr = InetAddress.getByName("192.168.0.254");

应用Server 的IP 和端口建立Socket 对象。

1	Socket socket = new Socket(serverAddr, 55555);

根据已经建立的Socket 来创建PrintWriter ，将信息通过这个对象来发送给Server ，其中包含了三个部分：

• OutputStreamWriter
• BufferedWriter
• PrintWriter