java 如何验证ip地址

Question

如题所述

Answer 1

可以使用正则表达式验证ip地址，ip地址分为v4和v6两个版本，v4为32位，分4段，中间用.隔开，v6为128位，可分为4段32位中间用::隔开。

以下是验证类详细代码：
import java.util.regex.Pattern;
/**
* A collection of utilities relating to InetAddresses.
*/
public class InetAddressUtils {
public static void main(String[] args){
String addr="192.168.1.2";
System.out.println(isIPv4Address(addr));
}

private static final Pattern IPV4_PATTERN =
Pattern.compile(
"^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$");

private static final Pattern IPV6_STD_PATTERN =
Pattern.compile(
"^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");

private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
Pattern.compile(
"^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");

public static boolean isIPv4Address(final String input) {
return IPV4_PATTERN.matcher(input).matches();
}

public static boolean isIPv6StdAddress(final String input) {
return IPV6_STD_PATTERN.matcher(input).matches();
}

public static boolean isIPv6HexCompressedAddress(final String input) {
return IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
}

public static boolean isIPv6Address(final String input) {
return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
}
}

Answer 2

验证ip是什么意思？
可以试试用正则表达式匹配本回答被提问者和网友采纳