1 import java.io.PrintStream;
 2 import java.net.Socket;
 3 import java.net.ServerSocket;
 4 import java.util.Scanner;
 5 
 6 public class Server
 7 {
 8     public static void main(String[] args)
 9         throws Exception
10     {
11         ServerSocket ss = new ServerSocket(30000);
12         Socket socket = ss.accept();
 
13         PrintStream ps = new PrintStream(socket.getOutputStream());
14         ps.println("服務器的第一行數據");
15         ps.println("服務器的第二行數據");
16         // 關閉socket的輸出流，表明輸出數據已經結束
17         socket.shutdownOutput();
18         // 下面語句將輸出false，表明socket還未關閉。
19         System.out.println(socket.isClosed());
 
20         Scanner scan = new Scanner(socket.getInputStream());
21         while (scan.hasNextLine())
22         {
23             System.out.println(scan.nextLine());
24         }
25         scan.close();
26         socket.close();
27         ss.close();
28     }
29 }

運行上面代碼，出現下面錯誤：

ServerSocket ss = new ServerSocket(30000);//錯誤在這一行，表明30000端口被占用，原因是可能有程序在占用30000端口，你可以換個端口試一試！

Exception in thread "main" java.net.BindException: Address already in use: JVM_Bind