e145. getting the hostname of an ip address.txt

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) {
    }