Java 从IPv4映射的IPv6地址转换
从IPv4映射的IPv6地址转换
实例源码：
源代码：
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/*3
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* Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.5
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.7
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*9
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* This code is free software; you can redistribute it and/or modify it11
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* under the terms of the GNU General Public License version 2 only, as13
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* published by the Free Software Foundation. Oracle designates this15
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* particular file as subject to the "Classpath" exception as provided17
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* by Oracle in the LICENSE file that accompanied this code.19
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*21
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* This code is distributed in the hope that it will be useful, but WITHOUT23
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or25
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License27
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* version 2 for more details (a copy is included in the LICENSE file that29
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* accompanied this code).31
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*33
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* You should have received a copy of the GNU General Public License version35
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* 2 along with this work; if not, write to the Free Software Foundation,37
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.39
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*41
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA43
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* or visit www.oracle.com if you need additional information or have any45
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* questions.47
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*/49
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//package com.nowjava;// 来 自 时 代 J a v a 公 众 号51
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public class Main {54
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public static void main(String[] argv) throws Exception {56
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byte[] addr = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };58
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System.out.println(java.util.Arrays60
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.toString(convertFromIPv4MappedAddress(addr)));62
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}64
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private static final int INADDR4SZ = 4;67
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private static final int INADDR16SZ = 16;69
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public static byte[] convertFromIPv4MappedAddress(byte[] addr) {72
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if (isIPv4MappedAddress(addr)) {74
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byte[] newAddr = new byte[INADDR4SZ];/** 来 自 N o w J a v a . c o m - 时 代 Java**/76
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System.arraycopy(addr, 12, newAddr, 0, INADDR4SZ);78
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return newAddr;80
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}82
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return null;84
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}86
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/**89
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* Utility routine to check if the InetAddress is an91
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* IPv4 mapped IPv6 address.93
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*95
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* @return a <code>boolean</code> indicating if the InetAddress is97
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* an IPv4 mapped IPv6 address; or false if address is IPv4 address.99
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*/101
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private static boolean isIPv4MappedAddress(byte[] addr) {103
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if (addr.length < INADDR16SZ) {105
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return false;107
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}109
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