首先 编写Client程序：

1 import java.io.IOException; 2 import java.net.Socket; 3 import java.util.Scanner; 4  5 public class Client { 6     public static void main(String[] args) throws IOException { 7         /** 8          * 创建Socket 9          * 接收服务器端发送数据10          */11         Socket socket = new Socket("127.0.0.1", 9999);12         Scanner sc = new Scanner(socket.getInputStream());13         sc.useDelimiter("\n");14         while(sc.hasNext()){15             System.out.println(sc.next());16         }17         sc.close();18         socket.close();19     }20 }

客户端通过多线程发送给客户端数据：

1 import java.io.PrintStream; 2 import java.net.ServerSocket; 3 import java.net.Socket; 4  5 class ThreadSocket implements Runnable { 6     /** 7      * 线程接收到socket实例后执行run（）处理 8      */ 9     private Socket socket;10     11     public ThreadSocket(Socket socket) {12         this.socket = socket;13     }14 15     @Override16     public void run() {17         try {18             PrintStream printStream = new PrintStream(socket.getOutputStream());19             printStream.println("
nihao erzhi
");20             printStream.close();21             socket.close();22         } catch (Exception e) {23             e.printStackTrace();24         }25     }26 }27 28 public class Server {29     public static void main(String[] args) throws Exception {30         /**31          * 创建ServerSocket32          */33         ServerSocket server = new ServerSocket(9999);34         Socket socket = null;35         while (true) {36             /**37              * 死循环监听端口38              * 有消息开一个线程处理39              */40             socket = server.accept();41             new Thread(new ThreadSocket(socket)).start();42         }43     }44 }