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    基于Java检查IPv6地址的合法性

    栏目:代码类 时间:2020-01-14 12:07

    这篇文章主要介绍了基于Java检查IPv6地址的合法性,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

    由于IPv4资源即将耗尽,IPv6将要正式启用,这是大势所趋。

    一些现有的服务和应用逐步要对IPv6支持,目前还处在过渡阶段。

    提前了解一些IPv6的知识,还是有必要的。

    如何判断一个IP地址,是否为IPv6地址呢?

    以下代码是用Java实现的,用于校验IPv6地址合法性。

    代码如下:

    import java.text.Normalizer;
    import java.text.Normalizer.Form;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    public class IPV6Check {
     
      public static void main(String[] args) {
        String ipv6_1 = "2019:db8:a583:64:c68c:d6df:600c:ee9a";
        String ipv6_2 = "2019:db8:a583::9e42:be55:53a7";
        String ipv6_3 = "2019:db8:a583:::9e42:be55:53a7";
        String ipv6_4 = "1:2:3:4:5::192.168.254.254";
        String ipv6_5 = "ABCD:910A:2222:5498:8475:1111:3900:2020";
        String ipv6_6 = "1030::C9B4:FF12:48AA:1A2B";
        String ipv6_7 = "2019:0:0:0:0:0:0:1";
        String ipv6_8 = "::0:0:0:0:0:0:1";
        String ipv6_9 = "2019:0:0:0:0::";
        String ipv6_10= "2048:877e:31::7";
    
        String resultLine = "\n==> ";
        String splitLine = "\n----------------------------------------------------\n";
        System.out.println(ipv6_1 + resultLine + isValidIpv6Addr(ipv6_1) + splitLine);
        System.out.println(ipv6_2 + resultLine + isValidIpv6Addr(ipv6_2) + splitLine);
        System.out.println(ipv6_3 + resultLine + isValidIpv6Addr(ipv6_3) + splitLine);
        System.out.println(ipv6_4 + resultLine + isValidIpv6Addr(ipv6_4) + splitLine);
        System.out.println(ipv6_5 + resultLine + isValidIpv6Addr(ipv6_5) + splitLine);
        System.out.println(ipv6_6 + resultLine + isValidIpv6Addr(ipv6_6) + splitLine);
        System.out.println(ipv6_7 + resultLine + isValidIpv6Addr(ipv6_7) + splitLine);
        System.out.println(ipv6_8 + resultLine + isValidIpv6Addr(ipv6_8) + splitLine);
        System.out.println(ipv6_9 + resultLine + isValidIpv6Addr(ipv6_9) + splitLine);
        System.out.println(ipv6_10 + resultLine + isValidIpv6Addr(ipv6_10) + splitLine);
      }
    
      /**
       * 校验IPv6地址的合法性
       * @param ipAddr
       * @return
       */
      public static boolean isValidIpv6Addr(String ipAddr) {
     
        String regex = "(^((([0-9A-Fa-f]{1,4}:){7}(([0-9A-Fa-f]{1,4}){1}|:))"
            + "|(([0-9A-Fa-f]{1,4}:){6}((:[0-9A-Fa-f]{1,4}){1}|"
            + "((22[0-3]|2[0-1][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})([.](25[0-5]|2[0-4][0-9]|"
            + "[0-1][0-9][0-9]|([0-9]){1,2})){3})|:))|"
            + "(([0-9A-Fa-f]{1,4}:){5}((:[0-9A-Fa-f]{1,4}){1,2}|"
            + ":((22[0-3]|2[0-1][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})([.](25[0-5]|2[0-4][0-9]|"
            + "[0-1][0-9][0-9]|([0-9]){1,2})){3})|:))|"
            + "(([0-9A-Fa-f]{1,4}:){4}((:[0-9A-Fa-f]{1,4}){1,3}"
            + "|:((22[0-3]|2[0-1][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})([.](25[0-5]|2[0-4][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})){3})|:))|(([0-9A-Fa-f]{1,4}:){3}((:[0-9A-Fa-f]{1,4}){1,4}|"
            + ":((22[0-3]|2[0-1][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})([.](25[0-5]|2[0-4][0-9]|"
            + "[0-1][0-9][0-9]|([0-9]){1,2})){3})|:))|"
            + "(([0-9A-Fa-f]{1,4}:){2}((:[0-9A-Fa-f]{1,4}){1,5}|"
            + ":((22[0-3]|2[0-1][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})([.](25[0-5]|2[0-4][0-9]|"
            + "[0-1][0-9][0-9]|([0-9]){1,2})){3})|:))"
            + "|(([0-9A-Fa-f]{1,4}:){1}((:[0-9A-Fa-f]{1,4}){1,6}"
            + "|:((22[0-3]|2[0-1][0-9]|[0-1][0-9][0-9]|"
            + "([0-9]){1,2})([.](25[0-5]|2[0-4][0-9]|"
            + "[0-1][0-9][0-9]|([0-9]){1,2})){3})|:))|"
            + "(:((:[0-9A-Fa-f]{1,4}){1,7}|(:[fF]{4}){0,1}:((22[0-3]|2[0-1][0-9]|"
            + "[0-1][0-9][0-9]|([0-9]){1,2})"
            + "([.](25[0-5]|2[0-4][0-9]|[0-1][0-9][0-9]|([0-9]){1,2})){3})|:)))$)";
     
        if (ipAddr == null) {
          System.out.println("IPv6 address is null ");
          return false;
        }
        ipAddr = Normalizer.normalize(ipAddr, Form.NFKC);
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(ipAddr);
     
        boolean match = matcher.matches();
        if (!match) {
           System.out.println("Invalid IPv6 address = " + ipAddr);
        }
     
        return match;
      }
     
    }
    
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