44 lines
969 B
Java
44 lines
969 B
Java
package top.wherewego.vnt.jni;
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/**
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* ip转换
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*
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* @author https://github.com/lbl8603/vnt
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*/
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public class IpUtils {
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/**
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* 将整数的ip地址转成字符串，例如 0 转成 "0.0.0.0"
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*
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* @param ipAddress
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* @return
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*/
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public static String intToIpAddress(int ipAddress) {
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return ((ipAddress & 0xFF000000) >>> 24) + "." +
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((ipAddress & 0x00FF0000) >>> 16) + "." +
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((ipAddress & 0x0000FF00) >>> 8) + "." +
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(ipAddress & 0x000000FF);
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}
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/**
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* 返回掩码的长度
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*
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* @param subnetMask
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* @return
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*/
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public static int subnetMaskToPrefixLength(int subnetMask) {
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int prefixLength = 0;
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int bit = 1 << 31;
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while (subnetMask != 0) {
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if ((subnetMask & bit) != bit) {
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break;
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}
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prefixLength++;
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subnetMask <<= 1;
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}
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return prefixLength;
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}
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}
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