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【Java】扫描一个网段内的可达ip

作者:就一傻子 / 发布于2014/9/10/ 432

给定一个网段的起始地址和结束地址，扫描改网段中可达的ip


	package com.demo.net;
	
	import java.io.IOException;
	import java.net.InetAddress;
	import java.net.UnknownHostException;
	import java.util.concurrent.*;
	
	/**
	* User:superman
	* Date:2014/9/7
	* Time:11:52
	*/
	public class IpScanner {
	 private int corePoolSize=30;
	 private int maximumPoolSize=50;
	 private long keepAliveTime=5000;
	 private BlockingDeque<Runnable> workQueue=new LinkedBlockingDeque<Runnable>();
	 private ExecutorService threadPoolExecutor=new ThreadPoolExecutor(corePoolSize,maximumPoolSize,keepAliveTime,
	 TimeUnit.MILLISECONDS,workQueue);
	 public void scan(String start,String end){
	 if(!validate(start)||!validate(end)){
	 System.err.println("Ip format Exception.");
	 return;
	 }
	 String pre = start.substring(0, start.lastIndexOf(".")+1);
	 int first = Integer.valueOf(start.split("\\.")[3]);
	 int last = Integer.valueOf(end.split("\\.")[3]);
	 if(first>last){
	 System.err.println("Ip format Exception.");
	 return;
	 }
	 for(int i=first;i<=last;i++){
	 String ipStr=pre+i;
	 while(workQueue.size()>maximumPoolSize){
	 try {
	// System.out.println("Thread queue is too long,sleep 500 milliseconds.");
	 Thread.sleep(500);
	 } catch (InterruptedException e) {
	 e.printStackTrace();
	 }
	 }
	 threadPoolExecutor.execute(new ScanWorker(ipStr));
	 }
	
	 threadPoolExecutor.shutdown();
	 while (!threadPoolExecutor.isTerminated()) {
	 try {
	 Thread.sleep(100);
	 } catch (InterruptedException e) {
	 e.printStackTrace();
	 }
	 }
	 System.out.println("Done.");
	 }
	
	 private boolean validate(String ip){
	 if(ip==null||ip.length()==0) return false;
	 String[] array=ip.split("\\.");
	 if(array.length!=4) return false;
	 for(String str:array){
	 try {
	 int num=Integer.valueOf(str);
	 } catch (NumberFormatException e) {
	 return false;
	 }
	 }
	 return true;
	 }
	
	 private class ScanWorker implements Runnable{
	 private String ipStr;
	 public ScanWorker(String ipStr){
	 this.ipStr=ipStr;
	 }
	 @Override
	 public void run() {
	 try {
	 InetAddress inetAddress=InetAddress.getByName(ipStr);
	 if(inetAddress.isReachable(5000)) { // wait 5 seconds
	 System.out.println("HostName:" + inetAddress.getHostName() + " Ip:" + inetAddress.getHostAddress());
	 }
	 } catch (UnknownHostException e) {
	 //e.printStackTrace();
	 } catch (IOException e) {
	 //e.printStackTrace();
	 }
	 }
	 }
	
	 public static void main(String[] args) {
	 IpScanner ipScanner=new IpScanner();
	 ipScanner.scan("192.168.1.1","192.168.1.255");
	 }
	}

试试其它关键字

　扫描ip　

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