java实现ICMP协议的ping功能

package com.beijia.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Ping {

	public static boolean ping(String ipAddress) throws Exception{
		int timeOut=3000;
		boolean status=InetAddress.getByName(ipAddress).isReachable(timeOut);   // 当返回值是true时，说明host是可用的
		return status;
	}
	
	public static void ping02(String ipAddress){
		String line=null;
		
		try {
			Process pro=Runtime.getRuntime().exec("ping "+ipAddress);
			BufferedReader buf=new BufferedReader(new InputStreamReader(pro.getInputStream()));
			while((line=buf.readLine())!=null){
				System.out.println(line);
			}
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}
	
	public static boolean ping(String ipAddress,int pingTimes,int timeOut){
		BufferedReader in=null;
		Runtime r=Runtime.getRuntime();
		String pingCommand="ping "+ipAddress+" -n "+pingTimes+" -w "+timeOut;
		
		try {//执行命令并获取输出
			System.out.println(pingCommand);
			Process p=r.exec(pingCommand);
			if(p==null){
				return false;
			}
			in=new BufferedReader(new InputStreamReader(p.getInputStream()));
			int connectedCount=0;
			String line=null;
			while((line=in.readLine())!=null){
				connectedCount+=getCheckResult(line);
			}//如果出现类似=20ms TTL=22这样的字符，出现的次数=测试次数 则返回真
			return connectedCount==pingTimes;
		} catch (Exception e) {
			e.printStackTrace();//出现异常则返回假
			return false;
		}finally{
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}	
		}
	}
	
	//若line含有=18ms TTL=16字样,说明已经ping通,返回1,否則返回0.
	private static int getCheckResult(String line){
		Pattern pattern=Pattern.compile("(\\d+ms)(\\s+)(TTL=\\d+)",Pattern.CASE_INSENSITIVE);
	    Matcher matcher = pattern.matcher(line); 
	    while(matcher.find()){
	    	return 1;
	    }
	    return 0;
	}
	
	public static void main(String[] args) throws Exception{
		String ipAddress="192.168.20.58";
		System.out.println(ping(ipAddress));
		ping02(ipAddress);
		System.out.println(ping(ipAddress,5,5000));
	}
}