检查参数是否为有效的IPv6地址（包括压缩地址）。

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 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements. See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership. The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License. You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing,

 * software distributed under the License is distributed on an

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 * KIND, either express or implied. See the License for the

 * specific language governing permissions and limitations

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 */

//package com.nowjava;

import java.util.regex.Pattern;/* from N o w J a v a . c o m - 时代Java*/


public class Main {

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

        String input = "nowjava.com";

        System.out.println(isIPv6Address(input));

    }


    private static final Pattern IPV6_STD_PATTERN = Pattern

            .compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");

    private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = Pattern

            .compile("^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" // 0-6 hex fields

                    + "::"

                    + "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$");

    private static final char COLON_CHAR = ':';

    private static final int MAX_COLON_COUNT = 7;


    /**

     * Checks whether the parameter is a valid IPv6 address (including compressed).

     *

     * @param input the address string to check for validity

     * @return true if the input parameter is a valid standard or compressed IPv6 address

     */

    public static boolean isIPv6Address(final String input) {

        return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);/**来自 n  o  w  j  a  v  a . c o m**/

    }


    /**

     * Checks whether the parameter is a valid standard (non-compressed) IPv6 address

     *

     * @param input the address string to check for validity

     * @return true if the input parameter is a valid standard (non-compressed) IPv6 address

     */

    public static boolean isIPv6StdAddress(final String input) {

        return IPV6_STD_PATTERN.matcher(input).matches();

    }