深圳方维网站建设/万网域名

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