IPv4Util.java
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package com.sitech.util;
/**
*
* @author liujhc <liujhc@si-tech.com.cn>
*/
public class IPv4Util {
/**
* 验证ip字符串是否合法
*
* @param ip 如 192.168.1.12
* @return
*/
public static boolean isValidIp(String ip) {
return ip != null && ip.matches("\\b(([01]?\\d?\\d|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d?\\d|2[0-4]\\d|25[0-5])\\b");
}
/**
* 将ip字符串解析成数值
*
* @param ip 如 192.168.1.12
* @return
*/
public static long parseIpToValue(String ip) {
if (isValidIp(ip)) {
long value = 0;
String[] arr = ip.split("\\.");
for (int i = 0; i < 4; i++) {
value += Long.parseLong(arr[i]) << (8 * (3 - i));
}
return value;
}
return -1;
}
/**
* 子网掩码所代表子网的ip容量
*
* @param netmask 如： 255.255.0.0
* @return 当提供的子网掩码无效时返回-1
*/
public static long getSubnetCapacity(String netmask) {
long value = IPv4Util.parseIpToValue(netmask);
return Long.toBinaryString(value).matches("^1+0+$") ? value ^ ((1L << 32) - 1) : -1;
}
/**
* <pre>子网掩码所代表子网的ip容量
* 8 --> 255.0.0.0
* 16 --> 255.255.0.0
* 24 --> 255.255.255.0</pre>
* @param netmask 如 24
* @return 当提供的子网掩码无效时返回-1
*/
public static long getSubnetCapacity(int netmask) {
return netmask > 0 && netmask < 32 ? (1L << (32 - netmask)) - 1 : -1;
}
/**
* 将ip由数值转换成192.168.1.1样式的文本
*
* @param ipvalue
* @return
*/
public static String toIpText(long ipvalue) {
if (ipvalue < 1L << 32) {
int[] ai = new int[4];
for (int i = 0; i < 4 && ipvalue != 0; i++) {
long tmp = ipvalue;
ipvalue >>= 8;
ai[i] = (int) (tmp - (ipvalue << 8));
}
return ai[3] + "." + ai[2] + "." + ai[1] + "." + ai[0];
}
return "INVALID IP";
}
public static void main(String[] args) {
long beginIpValue = IPv4Util.parseIpToValue("172.21.9.254");
long endIpValue = IPv4Util.parseIpToValue("172.21.10.4");
for(long i=beginIpValue; i<endIpValue; i++){
System.out.println(IPv4Util.toIpText(i));
}
}
}