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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；

欢马劈雪

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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 m

//package com.nowjava;

import sun.net.util.IPAddressUtil;

public class Main {

public static void main(String[] argv) throws Exception {

String ipAddress = "nowjava.com";

System.out.println(java.util.Arrays

.toString(parseIpAddress(ipAddress)));

}

/**

* This function parse the IP address string as a byte array

* If the IP address is IPv4 address, the byte array length is 4

* If the IP address is IPv6 address, the byte array length is 16

* If the host is not an IP address string, will return null;

* @param ipAddress

* @return if this is valid IPv4 address or IPv6 address, return byte array for the address

* otherwise return null.

* So, this method can be used to check if the ipAddress string is valid or not

public static byte[] parseIpAddress(String ipAddress) {

if (ipAddress == null)

return null;

boolean ipv6Expected = false;

if (ipAddress.charAt(0) == '[') {
        /**
        时代Java - N o w  J a v a . c o m
        **/

// This is supposed to be an IPv6 literal

if (ipAddress.length() > 2

&& ipAddress.charAt(ipAddress.length() - 1) == ']') {

ipAddress = ipAddress.substring(1, ipAddress.length() - 1);

ipv6Expected = true;

} else {

// This was supposed to be a IPv6 address, but it's not!

//throw new UnknownHostException(host + ": invalid IPv6 address");

return null;

}

// if host is an IP address, we won't do further lookup

if (Character.digit(ipAddress.charAt(0), 16) != -1

|| (ipAddress.charAt(0) == ':')) {

byte[] addressBytes = null;

//            int numericZone = -1;

//            String ifname = null;

// see if it is IPv4 address

addressBytes = IPAddressUtil.textToNumericFormatV4(ipAddress);

if (addressBytes == null) {

// see if it is IPv6 address

// Check if a numeric or string zone id is present

//                int pos;

//                if ((pos=ipAddress.indexOf ("%")) != -1) {

//                    numericZone = checkNumericZone (ipAddress);

//                    if (numericZone == -1) { /* remainder of string must be an ifname */

////                        ifname = ipAddress.substring (pos+1);

//                    }

//                }

addressBytes = IPAddressUtil
/**代码未完, 请加载全部代码(NowJava.com).**/

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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