ShardingSphere JDBC 分库实现多数据库源

Java IP相关操作

---

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