android->Socket容易用法

android-->Socket简单用法
Socket通常也称做”套接字“，用于描述IP地址和端口，废话不多说，它就是网络通信过程中端点的抽象表示。值得一提的是，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。这是两个封装得非常好的类，使用起来很方便！

下面将首先创建一个SocketServer的类作为服务端如下，该服务端实现了多线程机制，可以在特定端口处监听多个客户请求，一旦有客户请求，Server总是会创建一个服务纯种来服务新来的客户，而自己继续监听。程序中accept()是一个阻塞函数，所谓阻塞性方法就是说该方法被调用后将等待客户的请求，直到有一个客户启动并请求连接到相同的端口，然后accept()返回一个对应于客户的Socket。这时，客户方和服务方都建立了用于通信的Socket，接下来就是由各个Socket分别打开各自的输入、输出流。

SocketServer类，服务器实现：

package HA.Socket;
 
 import java.io.*;
 import java.net.*;
 
  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();
             }
         }
     }
 }

SocketClient类，客户端实现：

package HA.Socket;
 
 import java.io.*;
 import java.net.*;
 
  public class SocketClient {
     static Socket client;
     
     public SocketClient(String site, int port){
         try{
             client = new Socket(site,port);
             System.out.println("Client is created! site:"+site+" port:"+port);
         }catch (UnknownHostException e){
             e.printStackTrace();
         }catch (IOException e){
             e.printStackTrace();
         }
     }
     
     public String sendMsg(String msg){
         try{
             BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
             PrintWriter out = new PrintWriter(client.getOutputStream());
             out.println(msg);
             out.flush();
             return in.readLine();
         }catch(IOException e){
             e.printStackTrace();
         }
         return "";
     }
     public void closeSocket(){
         try{
             client.close();
         }catch(IOException e){
             e.printStackTrace();
         }
     }
     public static void main(String[] args) throws Exception{
         
     }
 
 }

接下来就是来测试Socket通信了！

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

再运行TestSocketClient类：

package HA.Socket;
 
  public class TestSocketClient {
 
     public static void main(String[] args){
         
         SocketClient client = new SocketClient("127.0.0.1",12345);
         System.out.println(client.sendMsg("nimei1"));
         client.closeSocket();
         
         SocketClient client1 = new SocketClient("127.0.0.1",12345);
         System.out.println(client1.sendMsg("nimei1111"));
         client1.closeSocket();
         
         SocketClient client11 = new SocketClient("127.0.0.1",12345);
         System.out.println(client11.sendMsg("nimei11111111"));
         client11.closeSocket();
         
         SocketClient client111 = new SocketClient("127.0.0.1",12345);
         System.out.println(client111.sendMsg("nimei11111111111111111"));
         client111.closeSocket();
         
     }
 }

输出如下
服务端
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei1
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei1111
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei11111111
Client is created! site:127.0.0.1 port:12345
Hello!world!! nimei11111111111111111

客户端：

nimei1
nimei1111
nimei11111111
nimei11111111111111

android->Socket容易用法

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