JAVA中IP和整数相互转化介绍
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在项目中经常会用到IP(v4)范围判定比较的功能,一般将IP转化为整数再进行比较。
一、基本知识点
IP ——> 整数:
- 把IP地址转化为字节数组
- 通过左移位(<<)、与(&)、或(|)这些操作转为int
整数 ——> IP:
- 将整数值进行右移位操作(>>>),右移24位,再进行与操作符(&)0xFF,得到的数字即为第一段IP。
- 将整数值进行右移位操作(>>>),右移16位,再进行与操作符(&)0xFF,得到的数字即为第二段IP。
- 将整数值进行右移位操作(>>>),右移8位,再进行与操作符(&)0xFF,得到的数字即为第三段IP。
- 将整数值进行与操作符(&)0xFF,得到的数字即为第四段IP。
二、java代码示例
IPv4Util.java
- package michael.utils;
- import java.net.InetAddress;
- /**
- * @author michael <br>
- * blog: http://sjsky.iteye.com <br>
- * mail: sjsky007@gmail.com
- */
- public class IPv4Util {
- private final static int INADDRSZ = 4;
- /**
- * 把IP地址转化为字节数组
- * @param ipAddr
- * @return byte[]
- */
- public static byte[] ipToBytesByInet(String ipAddr) {
- try {
- return InetAddress.getByName(ipAddr).getAddress();
- } catch (Exception e) {
- throw new IllegalArgumentException(ipAddr + " is invalid IP");
- }
- }
- /**
- * 把IP地址转化为int
- * @param ipAddr
- * @return int
- */
- public static byte[] ipToBytesByReg(String ipAddr) {
- byte[] ret = new byte[4];
- try {
- String[] ipArr = ipAddr.split("//.");
- ret[0] = (byte) (Integer.parseInt(ipArr[0]) & 0xFF);
- ret[1] = (byte) (Integer.parseInt(ipArr[1]) & 0xFF);
- ret[2] = (byte) (Integer.parseInt(ipArr[2]) & 0xFF);
- ret[3] = (byte) (Integer.parseInt(ipArr[3]) & 0xFF);
- return ret;
- } catch (Exception e) {
- throw new IllegalArgumentException(ipAddr + " is invalid IP");
- }
- }
- /**
- * 字节数组转化为IP
- * @param bytes
- * @return int
- */
- public static String bytesToIp(byte[] bytes) {
- return new StringBuffer().append(bytes[0] & 0xFF).append('.').append(
- bytes[1] & 0xFF).append('.').append(bytes[2] & 0xFF)
- .append('.').append(bytes[3] & 0xFF).toString();
- }
- /**
- * 根据位运算把 byte[] -> int
- * @param bytes
- * @return int
- */
- public static int bytesToInt(byte[] bytes) {
- int addr = bytes[3] & 0xFF;
- addr |= ((bytes[2] << 8) & 0xFF00);
- addr |= ((bytes[1] << 16) & 0xFF0000);
- addr |= ((bytes[0] << 24) & 0xFF000000);
- return addr;
- }
- /**
- * 把IP地址转化为int
- * @param ipAddr
- * @return int
- */
- public static int ipToInt(String ipAddr) {
- try {
- return bytesToInt(ipToBytesByInet(ipAddr));
- } catch (Exception e) {
- throw new IllegalArgumentException(ipAddr + " is invalid IP");
- }
- }
- /**
- * ipInt -> byte[]
- * @param ipInt
- * @return byte[]
- */
- public static byte[] intToBytes(int ipInt) {
- byte[] ipAddr = new byte[INADDRSZ];
- ipAddr[0] = (byte) ((ipInt >>> 24) & 0xFF);
- ipAddr[1] = (byte) ((ipInt >>> 16) & 0xFF);
- ipAddr[2] = (byte) ((ipInt >>> 8) & 0xFF);
- ipAddr[3] = (byte) (ipInt & 0xFF);
- return ipAddr;
- }
- /**
- * 把int->ip地址
- * @param ipInt
- * @return String
- */
- public static String intToIp(int ipInt) {
- return new StringBuilder().append(((ipInt >> 24) & 0xff)).append('.')
- .append((ipInt >> 16) & 0xff).append('.').append(
- (ipInt >> 8) & 0xff).append('.').append((ipInt & 0xff))
- .toString();
- }
- /**
- * 把192.168.1.1/24 转化为int数组范围
- * @param ipAndMask
- * @return int[]
- */
- public static int[] getIPIntScope(String ipAndMask) {
- String[] ipArr = ipAndMask.split("/");
- if (ipArr.length != 2) {
- throw new IllegalArgumentException("invalid ipAndMask with: "
- + ipAndMask);
- }
- int netMask = Integer.valueOf(ipArr[1].trim());
- if (netMask < 0 || netMask > 31) {
- throw new IllegalArgumentException("invalid ipAndMask with: "
- + ipAndMask);
- }
- int ipInt = IPv4Util.ipToInt(ipArr[0]);
- int netIP = ipInt & (0xFFFFFFFF << (32 - netMask));
- int hostScope = (0xFFFFFFFF >>> netMask);
- return new int[] { netIP, netIP + hostScope };
- }
- /**
- * 把192.168.1.1/24 转化为IP数组范围
- * @param ipAndMask
- * @return String[]
- */
- public static String[] getIPAddrScope(String ipAndMask) {
- int[] ipIntArr = IPv4Util.getIPIntScope(ipAndMask);
- return new String[] { IPv4Util.intToIp(ipIntArr[0]),
- IPv4Util.intToIp(ipIntArr[0]) };
- }
- /**
- * 根据IP 子网掩码(192.168.1.1 255.255.255.0)转化为IP段
- * @param ipAddr ipAddr
- * @param mask mask
- * @return int[]
- */
- public static int[] getIPIntScope(String ipAddr, String mask) {
- int ipInt;
- int netMaskInt = 0, ipcount = 0;
- try {
- ipInt = IPv4Util.ipToInt(ipAddr);
- if (null == mask || "".equals(mask)) {
- return new int[] { ipInt, ipInt };
- }
- netMaskInt = IPv4Util.ipToInt(mask);
- ipcount = IPv4Util.ipToInt("255.255.255.255") - netMaskInt;
- int netIP = ipInt & netMaskInt;
- int hostScope = netIP + ipcount;
- return new int[] { netIP, hostScope };
- } catch (Exception e) {
- throw new IllegalArgumentException("invalid ip scope express ip:"
- + ipAddr + " mask:" + mask);
- }
- }
- /**
- * 根据IP 子网掩码(192.168.1.1 255.255.255.0)转化为IP段
- * @param ipAddr ipAddr
- * @param mask mask
- * @return String[]
- */
- public static String[] getIPStrScope(String ipAddr, String mask) {
- int[] ipIntArr = IPv4Util.getIPIntScope(ipAddr, mask);
- return new String[] { IPv4Util.intToIp(ipIntArr[0]),
- IPv4Util.intToIp(ipIntArr[0]) };
- }
- /**
- * @param args
- * @throws Exception
- */
- public static void main(String[] args) throws Exception {
- String ipAddr = "192.168.8.1";
- byte[] bytearr = IPv4Util.ipToBytesByInet(ipAddr);
- StringBuffer byteStr = new StringBuffer();
- for (byte b : bytearr) {
- if (byteStr.length() == 0) {
- byteStr.append(b);
- } else {
- byteStr.append("," + b);
- }
- }
- System.out.println("IP: " + ipAddr + " ByInet --> byte[]: [ " + byteStr
- + " ]");
- bytearr = IPv4Util.ipToBytesByReg(ipAddr);
- byteStr = new StringBuffer();
- for (byte b : bytearr) {
- if (byteStr.length() == 0) {
- byteStr.append(b);
- } else {
- byteStr.append("," + b);
- }
- }
- System.out.println("IP: " + ipAddr + " ByReg --> byte[]: [ " + byteStr
- + " ]");
- System.out.println("byte[]: " + byteStr + " --> IP: "
- + IPv4Util.bytesToIp(bytearr));
- int ipInt = IPv4Util.ipToInt(ipAddr);
- System.out.println("IP: " + ipAddr + " --> int: " + ipInt);
- System.out.println("int: " + ipInt + " --> IP: "
- + IPv4Util.intToIp(ipInt));
- String ipAndMask = "192.168.1.1/24";
- int[] ipscope = IPv4Util.getIPIntScope(ipAndMask);
- System.out.println(ipAndMask + " --> int地址段:[ " + ipscope[0] + ","
- + ipscope[1] + " ]");
- System.out.println(ipAndMask + " --> IP 地址段:[ "
- + IPv4Util.intToIp(ipscope[0]) + ","
- + IPv4Util.intToIp(ipscope[1]) + " ]");
- String ipAddr1 = "192.168.1.1", ipMask1 = "255.255.255.0";
- int[] ipscope1 = IPv4Util.getIPIntScope(ipAddr1, ipMask1);
- System.out.println(ipAddr1 + " , " + ipMask1 + " --> int地址段 :[ "
- + ipscope1[0] + "," + ipscope1[1] + " ]");
- System.out.println(ipAddr1 + " , " + ipMask1 + " --> IP地址段 :[ "
- + IPv4Util.intToIp(ipscope1[0]) + ","
- + IPv4Util.intToIp(ipscope1[1]) + " ]");
- }
- }
测试运行结果:
引用
IP: 192.168.8.1 ByInet --> byte[]: [ -64,-88,8,1 ]
IP: 192.168.8.1 ByReg --> byte[]: [ -64,-88,8,1 ]
byte[]: -64,-88,8,1 --> IP: 192.168.8.1
IP: 192.168.8.1 --> int: -1062729727
int: -1062729727 --> IP: 192.168.8.1
192.168.1.1/24 --> int地址段:[ -1062731520,-1062731265 ]
192.168.1.1/24 --> IP 地址段:[ 192.168.1.0,192.168.1.255 ]
192.168.1.1 , 255.255.255.0 --> int地址段 :[ -1062731520,-1062731265 ]
192.168.1.1 , 255.255.255.0 --> IP地址段 :[ 192.168.1.0,192.168.1.255 ]
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