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简介
本篇文章，记录Java中与IP相关的一些操作封装：IPV4地址与数字之间的互转、判断某个ip是否在一个网段内、判断A子网是否属于B子网
IPV4地址与数字的互转
package cn.nssas.eelantech.utils;
public class IPV4Util {
/**
* @param ipAddress
* @return
*/
public static long ipToLong(String ipAddress) {
long result = 0;
String[] ipAddressInArray = ipAddress.split("\\.");
for (int i = 3; i >= 0; i--) {
long ip = Long.parseLong(ipAddressInArray[3 - i]);
// left shifting 24,16,8,0 and bitwise OR
// 1. 192 << 24
// 1. 168 << 16
// 1. 1 << 8
// 1. 2 << 0
result |= ip << (i * 8);
}
return result;
}
/**
* @param ip
* @return
*/
public static String longToIp(long ip) {
StringBuilder result = new StringBuilder(15);
for (int i = 0; i < 4; i++) {
result.insert(0, Long.toString(ip & 0xff));
if (i < 3) {
result.insert(0, '.');
}
ip = ip >> 8;
}
return result.toString();
}
/**
* @param ip
* @return
*/
public static String longToIp2(long ip) {
return ((ip >> 24) & 0xFF) + "." + ((ip >> 16) & 0xFF) + "."
+ ((ip >> 8) & 0xFF) + "." + (ip & 0xFF);
}
}
java判断某个ip是否在一个网段内 ip/mask IP+掩码
package com.ip;
public class IpTest {
public static void main(String[] args) {
System.out.println(isInRange("192.168.1.127", "192.168.1.64/26"));
System.out.println(isInRange("192.168.1.2", "192.168.0.0/23"));
System.out.println(isInRange("192.168.0.1", "192.168.0.0/24"));
System.out.println(isInRange("192.168.0.0", "192.168.0.0/32"));
}
public static boolean isInRange(String ip, String cidr) {
String[] ips = ip.split("\\.");
int ipAddr = (Integer.parseInt(ips[0]) << 24)
| (Integer.parseInt(ips[1]) << 16)
| (Integer.parseInt(ips[2]) << 8) | Integer.parseInt(ips[3]);
int type = Integer.parseInt(cidr.replaceAll(".*/", ""));
int mask = 0xFFFFFFFF << (32 - type);
String cidrIp = cidr.replaceAll("/.*", "");
String[] cidrIps = cidrIp.split("\\.");
int cidrIpAddr = (Integer.parseInt(cidrIps[0]) << 24)
| (Integer.parseInt(cidrIps[1]) << 16)
| (Integer.parseInt(cidrIps[2]) << 8)
| Integer.parseInt(cidrIps[3]);
return (ipAddr & mask) == (cidrIpAddr & mask);
}
}
判断A子网是否属于B子网
public class IpTest {
public boolean isSubnetInSubnet(String subnet1, String subnet2) {
String[] split1 = subnet1.split("/");
String ip1 = split1[0];
String mask1 = split1[1];
String[] split2 = subnet2.split("/");
String ip2 = split2[0];
String mask2 = split2[1];
if(mask1.compareTo(mask2) < 1) {
return false;
}
String maskBit2 = getMaskByMaskBit(mask2);
Long ipNumber1 = getIpFromString(ip1);
Long ipNumber2 = getIpFromString(ip2);
Long ipNumber3 = getIpFromString(maskBit2);
if((ipNumber1 & ipNumber3) == (ipNumber2 & ipNumber3)) {
return true;
}
return false;
}
/**
* 把xx.xx.xx.xx类型的转为long类型的
*
* @param ip
* @return
*/
public Long getIpFromString(String ip)
{
Long ipLong = 0L;
String ipTemp = ip;
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf('.')));
ipTemp = ipTemp.substring(ipTemp.indexOf('.') + 1, ipTemp.length());
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf('.')));
ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf('.')));
ipTemp = ipTemp.substring(ipTemp.indexOf('.') + 1, ipTemp.length());
ipLong = ipLong * 256 + Long.parseLong(ipTemp);
return ipLong;
}
/**
* 根据掩码位获取掩码
*
* @param maskBit
* 掩码位数，如"28"、"30"
* @return
*/
public String getMaskByMaskBit(String maskBit)
{
return "".equals(maskBit) ? "error, maskBit is null !" : getMaskMap(maskBit);
}
public String getMaskMap(String maskBit) {
if ("1".equals(maskBit)) {
return "128.0.0.0";
}
if ("2".equals(maskBit)) {
return "192.0.0.0";
}
if ("3".equals(maskBit)) {
return "224.0.0.0";
}
if ("4".equals(maskBit)) {
return "240.0.0.0";
}
if ("5".equals(maskBit)) {
return "248.0.0.0";
}
if ("6".equals(maskBit)) {
return "252.0.0.0";
}
if ("7".equals(maskBit)) {
return "254.0.0.0";
}
if ("8".equals(maskBit)) {
return "255.0.0.0";
}
if ("9".equals(maskBit)) {
return "255.128.0.0";
}
if ("10".equals(maskBit)) {
return "255.192.0.0";
}
if ("11".equals(maskBit)) {
return "255.224.0.0";
}
if ("12".equals(maskBit)) {
return "255.240.0.0";
}
if ("13".equals(maskBit)) {
return "255.248.0.0";
}
if ("14".equals(maskBit)) {
return "255.252.0.0";
}
if ("15".equals(maskBit)) {
return "255.254.0.0";
}
if ("16".equals(maskBit)) {
return "255.255.0.0";
}
if ("17".equals(maskBit)) {
return "255.255.128.0";
}
if ("18".equals(maskBit)) {
return "255.255.192.0";
}
if ("19".equals(maskBit)) {
return "255.255.224.0";
}
if ("20".equals(maskBit)) {
return "255.255.240.0";
}
if ("21".equals(maskBit)) {
return "255.255.248.0";
}
if ("22".equals(maskBit)) {
return "255.255.252.0";
}
if ("23".equals(maskBit)) {
return "255.255.254.0";
}
if ("24".equals(maskBit)) {
return "255.255.255.0";
}
if ("25".equals(maskBit)) {
return "255.255.255.128";
}
if ("26".equals(maskBit)) {
return "255.255.255.192";
}
if ("27".equals(maskBit)) {
return "255.255.255.224";
}
if ("28".equals(maskBit)) {
return "255.255.255.240";
}
if ("29".equals(maskBit)) {
return "255.255.255.248";
}
if ("30".equals(maskBit)) {
return "255.255.255.252";
}
if ("31".equals(maskBit)) {
return "255.255.255.254";
}
if ("32".equals(maskBit)) {
return "255.255.255.255";
}
return "-1";
}
}
