真巧, 我刚好做了一个扫描整个网段的多线程程序, 不过利用ping加参数-JSP教程,Java技巧及代码

扫描500个ip10秒钟左右, 一个ip等待0.3秒
说来惭愧, 我觉得是用java写的过程编程, 少贴一点仅供参考:
package steeven;

import java.sql.*;
import java.io.*;
import java.util.*;
import java.text.*;
import javax.servlet.http.*;

public class ip extends common implements runnable{

  public string ip;           // ip, 用户名, 主机名

  resultset list;                 // 分页显示的记录集
  public ip cur;               // 分页显示的当前记录

  static public hashtable ping = new hashtable(); //ping 后的结果集
  static int threadcount = 0;  //当前线程的数量, 防止过多线程摧毁电脑

  public ip() {}
  public ip(string ip){
    this.ip=ip;
    thread r = new thread(this);
    r.start();
  }

  public static void ping(string ip) throws exception{
    //最多30个线程
    while(threadcount>30)
      thread.sleep(50);
    threadcount +=1;
    ip p = new ip(ip);
  }
  public void pingall() throws exception{
    threadcount =0;
    ping = new hashtable();
    while(next())  //next()对所有局域网ip放到cur
      ping(cur.ip);
    //等着所有ping结束
    while(threadcount>0)
      thread.sleep(50);
  }
  public void run(){
    try{
      process p= runtime.getruntime().exec ("ping "+ip+ " -w 300 -n 1");
      inputstreamreader ir = new inputstreamreader(p.getinputstream());
      linenumberreader input = new linenumberreader (ir);
      //读取结果行
      for (int i=1 ; i<7; i++)
        input.readline();
      string line= input.readline();
      
      if (line.length()<17 || line.substring(8,17).equals("timed out"))
        ping.put(ip,new boolean(false));
      else
        ping.put(ip,new boolean(true));
      //线程结束
      threadcount -= 1;
    }catch (ioexception e){}
  }
  public static void main(string[] args) throws exception{
    ip ip= new ip();
    ip.pingall();
    java.util.enumeration key = ping.keys();
    string k;
    while((k = (string)key.nextelement()) != null)
      system.out.println(k+": "+ping.get(k));
  }
}

1. 利用ping比较愚蠢, 但是相对简单些
2. 如果ping 成功后, 用nbtstat还可以得到主机名, 当前用户名, mac地址…一切尽在掌握中  🙂