2.Socket-测试本地端口是否被服务器监听

import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * @name 
 * @author wujianxiong
 * @date 2016-5-19
 */
public class PortScanner {

    /**
     * @name @param args
     * @author wujianxiong
     * @date 2016-5-19
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String host = "127.0.0.1";
        if(args.length>0)
            host = args[0];
        PortScanner.scan(host);
    }
    
    /**
     * 扫描端口
     * @name @param host
     * @author wujianxiong
     * @date 2016-5-19
     */
    public static void scan(String host){
        
        Socket socket = null;
        //扫描端口
        for(int port=1;port<1024;port++){
            try {
                socket = new Socket(host, port);
                System.out.println("成功连接本地端口："+port);
            } catch (UnknownHostException e) {
                System.out.println("未知错误！");
            } catch (IOException e) {
                System.out.println("连接端口："+port+"失败！");
            } finally{
                try {
                    if(socket!=null)
                        socket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

}