java 扫描TCP端口

import java.io.IOException; import java.net.Socket; import java.net.UnknownHostException; public class NetDemo_16 { public static void main(String[] args){ String str = "localhost"; if(args.length>0){ str = args[0]; } for(int i=100;i<500;i++){ //使用循环扫描端口 try { Socket s = new Socket(); System.out.println("There is a server on"+i+"of"+s); } catch (Exception e) { e.printStackTrace(); break; } } } }