public class Hello {

public boolean isIPv6(String address)

{

boolean result = false;

String regHex = "(\\p{XDigit}{1,4})";

//没有双冒号

String regIPv6Full = "^(" + regHex + ":){7}" + regHex + "$";

//双冒号在中间或者没有双冒号

String regIPv6AbWithColon = "^(" + regHex + "(:|::)){0,6}" + regHex

+ "$";

//双冒号开头

String regIPv6AbStartWithDoubleColon = "^(" + "::(" + regHex

+ ":){0,5}" + regHex + ")$";

String regIPv6 = "^(" + regIPv6Full + ")|("

+ regIPv6AbStartWithDoubleColon + ")|(" + regIPv6AbWithColon

+ ")$";

//System.out.println("regIPv6 =" + regIPv6);

//regIPv6 =^(^((\p{XDigit}{1,4}):){7}(\p{XDigit}{1,4})$)|(^(::((\p{XDigit}

//{1,4}):){0,5}(\p{XDigit}{1,4}))$)|(^((\p{XDigit}{1,4})(:|::)){0,6}(\p

//{XDigit}{1,4})$)$

//等价于^(^::$)|(^([\\d|a-fA-F]{1,4}:){7}([\\d|a-fA-F]{1,4})$)|(^(::

//(([\\d|a-fA-F]{1,5}([\\d|a-fA-F]{1,4}))$)|(^(([\\d|a-fA-F]{1,4})

//(:|::)){0,6}([\\d|a-fA-F]{1,4})$)$

//下面还要处理地址为::的情形和地址包含多于一个的::的情况(非法)

if (address.indexOf(":") != -1)

{

if (address.length() <= 39)

{

String addressTemp = address;

int doubleColon = 0;

if(address.equals("::"))return true;

while (addressTemp.indexOf("::") != -1)

{

addressTemp = addressTemp.substring(addressTemp

.indexOf("::") + 2,addressTemp.length());

doubleColon++;

}

if (doubleColon <= 1)

{

result = address.matches(regIPv6);

}

}

}

return result;

}

public static void main(String[] args)

{

Hello hello=new Hello();

boolean bln=false;

bln=hello.isIPv6("::");

System.out.println("Start...") ;

if (bln)

System.out.println("OK") ;

else

System.out.println("NO") ;

}

}

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