Java 如果IP地址为IPv4地址，则将IP地址字符串解析为字节数组；如果IP地址为IPv6地址，则字节数组长度为4；如果主机不是IP地址字符串，则字节数组长度为16，将返回空值；
如果IP地址为IPv4地址，则将IP地址字符串解析为字节数组；如果IP地址为IPv6地址，则字节数组长度为4；如果主机不是IP地址字符串，则字节数组长度为16，将返回空值；
实例源码：
源代码：
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// 来 自 N o w J a v a . c o m2
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//package com.nowjava;4
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import sun.net.util.IPAddressUtil;6
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public class Main {9
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public static void main(String[] argv) throws Exception {11
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String ipAddress = "nowjava.com";13
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System.out.println(java.util.Arrays15
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.toString(parseIpAddress(ipAddress)));17
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}19
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/**22
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* This function parse the IP address string as a byte array24
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* If the IP address is IPv4 address, the byte array length is 426
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* If the IP address is IPv6 address, the byte array length is 1628
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* If the host is not an IP address string, will return null;30
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* @param ipAddress32
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* @return if this is valid IPv4 address or IPv6 address, return byte array for the address34
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* otherwise return null.36
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* So, this method can be used to check if the ipAddress string is valid or not38
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*/40
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public static byte[] parseIpAddress(String ipAddress) {42
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if (ipAddress == null)44
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return null;46
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boolean ipv6Expected = false;48
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if (ipAddress.charAt(0) == '[') {50
/**51
时代Java - N o w J a v a . c o m52
**/53
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// This is supposed to be an IPv6 literal55
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if (ipAddress.length() > 257
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&& ipAddress.charAt(ipAddress.length() - 1) == ']') {59
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ipAddress = ipAddress.substring(1, ipAddress.length() - 1);61
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ipv6Expected = true;63
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} else {65
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// This was supposed to be a IPv6 address, but it's not!67
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//throw new UnknownHostException(host + ": invalid IPv6 address");69
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return null;71
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}73
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}75
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// if host is an IP address, we won't do further lookup78
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if (Character.digit(ipAddress.charAt(0), 16) != -180
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|| (ipAddress.charAt(0) == ':')) {82
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byte[] addressBytes = null;84
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// int numericZone = -1;86
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// String ifname = null;88
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// see if it is IPv4 address91
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addressBytes = IPAddressUtil.textToNumericFormatV4(ipAddress);93
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if (addressBytes == null) {95
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// see if it is IPv6 address97
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// Check if a numeric or string zone id is present99
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// int pos;101
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// if ((pos=ipAddress.indexOf ("%")) != -1) {103
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// numericZone = checkNumericZone (ipAddress);105
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// if (numericZone == -1) { /* remainder of string must be an ifname */107
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//// ifname = ipAddress.substring (pos+1);109
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// }111
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// }113
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addressBytes = IPAddressUtil115
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