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));
         }

 }