这里面包含了一百多个JAVA源文件

				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) {
				    }