scanservice.txt

JAVA的一些基础教程

1: import java.net.*;
2: import java.io.*;
3: public class ScanService {
4: 	public static void main(String[] args) {
5: 		String host = "localhost";
6: 		if (args.length > 0) {
7: 			host = args[0];
8: 		}
9: 		for (int i = 1; i < 1024; i++) {
10: 			try {
11: 				Socket s = new Socket(host, i);
12: 				System.out.println("有程序在" + host + "上侦听"
13: 				+ i + "端口");
14: 			}
15: 			catch (UnknownHostException e) {
16: 				System.err.println(e);
17: 				break;
18: 			}
19: 			catch (IOException e) {
20: 				// 没有程序在该端口侦听
21: 			}
22: 		} 
23: 	} 
24: }