public class Hello {
public boolean isIPv6(String address)
{
boolean result = false;
String regHex = "(})";
//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]{1,4}):){0,5}([\\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") ;
}
}