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JAVAÀïµÄPINGºÍTELNET

 JAVAÀïµÄPINGÊÇÔÚJDK 1.5ºóÓÃÁËеĺ¯ÊýisreachableȥʵÏÖ,¾ßÌå½éÉÜÈçÏÂ:
InetAddress¶ÔÏóµÄ³£Ó÷½·¨
InetAddressÀàÓкܶàget·½·¨£¬ÓÃÀ´»ñÈ¡Ö÷»úÃû£¬Ö÷»úµØÖ·µÈÐÅÏ¢¡£Ö÷ÒªÓУº
byte[] getAddress() ·µ»Ø´ÎInetAddress¶ÔÏóµÄԭʼIPµØÖ·£¬±£´æÎªÒ»¸öbyteÊý×é
String getCanonicalHostName() »ñÈ¡´ËIPµØÖ·µÄÍêÈ«ÏÞ¶¨ÓòÃû
String getHostAddress() »ñÈ¡IPµØÖ·µÄ×Ö·û´®£¬·µ»ØÎªÒ»¸öString
String getHostName() »ñÈ¡´ËIPµØÖ·µÄÖ÷»úÃû
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package org.dakiler.javanet.chapter1;
import java.net.InetAddress;
public class Example3
{
    public static void main(String args[])throws Exception
     {
         InetAddress address=InetAddress.getByName("www.microsoft.com");
         System.out.println("ip: "+address.getHostAddress());
         System.out.println("host: "+address.getHostName());
         System.out.println("canonical host name: "+address.getCanonicalHostName());
        byte[] bytes=address.getAddress();
        for(byte b:bytes)
         {
            if(b>=0)System.out.print(b);
            else System.out.print(256+b);
             System.out.print(" ");
         }
     }
}
Õâ¸öÀý×ÓÊ×ÏÈÊÇ»ñÈ¡www.microsoft.comµÄ¶ÔÓ¦µÄInetAddressʵÀý£¬È»ºó·Ö±ð´òÓ¡address.getHostAddress() address.getHostName()ÒÔ¼°address.getCanonicalHostName()¡£ÔÚÕâ¸öÀý×ÓÖУ¬ÐèҪעÒâµÄÊÇIPµØÖ·ÖУ¬Ã¿Ò»¸ö¶¼ÊÇ0-255Ö®¼äµÄ£¬ÊÇÎÞ·ûºÅµÄ¡£µ«ÊÇjavaÖеÄbyte±íʾµÄÇøÓòÊÇ-128~127,ËùÒÔÖмäÐèÒª×öÒ»¸öת»»¡£
½á¹ûÈçÏ£º
ip: 207.46.19.254
host: www.micro


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