pingUtil

 package unit;

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStreamReader;

 import java.net.InetAddress;

 import java.util.regex.Matcher;

 import java.util.regex.Pattern;

 public class pingUtil {

      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(),"utf-8"));

                 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(),"utf-8"));

                 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="www.qq.com";

 //            System.out.println(ping(ipAddress));

             ping02(ipAddress);

             System.out.println(ping(ipAddress,5,5000));

         }

 }