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前言：
本文补充一下Java关于套接字方面的内容，因为其应用相对比较简单，所以下面介绍两个程序实例。
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1.Socket对接过程
(注：这是之前在网上见过一张图片，大致过程还是比较清晰的）
分析：
2.实例一【Server->Client(1:1)】
1 package socket; 2 3 import java.io.DataInputStream; 4 import java.io.DataOutputStream; 5 import java.io.IOException; 6 import java.net.Inet4Address; 7 import java.net.InetAddress; 8 import java.net.ServerSocket; 9 import java.net.Socket; 10 import java.util.Date; 11 12 public class Server { 13 14 public Server(){ 15 try { 16 //服务端开启端口8000 17 ServerSocket serverSocket = new ServerSocket(8000); 18 System.out.println("server start at:"+new Date()); 19 //等待客户端相应 20 Socket socket = serverSocket.accept(); 21 InetAddress address = socket.getInetAddress(); 22 System.out.println("connected with address:"+address.getHostAddress()); 23 DataInputStream input = new DataInputStream(socket.getInputStream()); 24 DataOutputStream output = new DataOutputStream(socket.getOutputStream()); 25 26 //while(true){ 27 int num = input.readInt(); 28 System.out.println(num); 29 //} 30 31 } catch (IOException e) { 32 e.printStackTrace(); 33 } 34 } 35 36 public static void main(String[] args) { 37 new Server(); 38 } 39 40 }
1 package socket; 2 3 import java.io.DataInputStream; 4 import java.io.DataOutputStream; 5 import java.net.Socket; 6 7 public class Client { 8 public static void main(String[] args) throws Exception { 9 10 System.out.println("--client--"); 11 12 //Socket(,)内参数分别设为服务端IP和端口 13 Socket socket = new Socket("localhost", 8000); 14 15 DataInputStream input = new DataInputStream(socket.getInputStream()); 16 DataOutputStream output = new DataOutputStream(socket.getOutputStream()); 17 18 int x = 222; 19 output.writeInt(x); 20 System.out.println("data convented:"+x); 21 } 22 }
服务端输出（执行之后显示红点，表示等待中...）：
server start at:Sat Aug 15 19:39:40 CST 2015
connected with address:127.0.0.1
222
客户端输出：
--client--
data convented:222
3.实例二【Server->Client(1:n)】
1 package socket; 2 3 import java.io.DataInputStream; 4 import java.io.DataOutputStream; 5 import java.net.InetAddress; 6 import java.net.ServerSocket; 7 import java.net.Socket; 8 import java.util.Date; 9 10 public class SuperServer { 11 private int countOfClient=0; 12 public SuperServer() { 13 try { 14 ServerSocket serverSocket = new ServerSocket(8000); 15 System.out.println("server start at:" + new Date()); 16 17 while (true) { 18 Socket socket = serverSocket.accept(); 19 InetAddress address = socket.getInetAddress(); 20 System.out.println("connected with address:" 21 + address.getHostAddress()); 22 //为每一位Client创建一个单独的线程 23 new Thread(new ConnectTask(socket)).start(); 24 countOfClient++; 25 System.out.println("this is the "+countOfClient + "(th) of client. "); 26 } 27 } catch (Exception e) { 28 e.printStackTrace(); 29 } 30 31 } 32 33 public static void main(String[] args) { 34 new SuperServer(); 35 } 36 37 class ConnectTask implements Runnable { 38 private Socket socket = null; 39 40 public ConnectTask(Socket socket) { 41 this.socket = socket; 42 } 43 44 @Override 45 public void run() { 46 try { 47 DataInputStream input = new DataInputStream( 48 socket.getInputStream()); 49 DataOutputStream output = new DataOutputStream( 50 socket.getOutputStream()); 51 52 int numFromClient = input.readInt(); 53 System.out.println("number from client:"+numFromClient); 54 } catch (Exception e) { 55 e.printStackTrace(); 56 } 57 } 58 59 } 60 61 }
以上代码中，服务端创建多线程，给每一个对接的客户端分一个独立的线程；客户端代码不变，还是实例一的代码。程序输出跟实例一近似，只不过这是服务端一直运行着，可供多个客户端连接。（因为独立分配线程，程序运行时资源比较浪费，所以代码仅供参考，有待优化！）
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原文地址：http://www.cnblogs.com/SeaSky0606/p/4733000.html
