这个压缩包里的都是超级经典的java例子

				
				
				
				Getting the Hostname of an IP Address (Java Developers Almanac Example)
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				The Java Developers Almanac 1.4
				
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				        Hostnames and IP Addresses
				             [3 examples]
				            
				
				  e145. Getting the Hostname of an IP Address
				
				This example attempts to retrieve the hostname for an IP address.
				Note that getHostName() may not succeed, in which case it simply
				returns the IP address.
				
				
				    try {
				        // Get hostname by textual representation of IP address
				        InetAddress addr = InetAddress.getByName("127.0.0.1");
				    
				        // Get hostname by a byte array containing the IP address
				        byte[] ipAddr = new byte[]{127, 0, 0, 1};
				        addr = InetAddress.getByAddress(ipAddr);
				    
				        // Get the host name
				        String hostname = addr.getHostName();
				    
				        // Get canonical host name
				        String hostnameCanonical = addr.getCanonicalHostName();
				    } catch (UnknownHostException e) {
				    }
				
				
				
				
				             Related Examples
				
				
				
				
				e144. 
				    Getting the IP Address of a Hostname
				
				
				
				e146. 
				    Getting the IP Address and Hostname of the Local Machine
				
				
				
				
				
				
				
				
				        See also: 
				
				    Datagram
				  
				
				
				    Encodings
				  
				
				
				    HTTP
				  
				
				
				    Multicast
				  
				
				
				    Sockets
				  
				
				
				    URLs
				  
				
				
				
				
				
				
				
				
				
				© 2002 Addison-Wesley.