118 lines
2.9 KiB
Java
118 lines
2.9 KiB
Java
package com.tiesheng.util.ip2region;
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/**
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* util class
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*
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* @author chenxin<chenxin619315 @ gmail.com>
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*/
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public class IpUtil {
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/**
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* write specfield bytes to a byte array start from offset
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*
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* @param b
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* @param offset
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* @param v
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* @param bytes
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*/
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public static void write(byte[] b, int offset, long v, int bytes) {
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for (int i = 0; i < bytes; i++) {
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b[offset++] = (byte) ((v >>> (8 * i)) & 0xFF);
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}
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}
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/**
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* write a int to a byte array
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*
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* @param b
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* @param offset
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* @param v
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*/
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public static void writeIntLong(byte[] b, int offset, long v) {
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b[offset++] = (byte) ((v >> 0) & 0xFF);
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b[offset++] = (byte) ((v >> 8) & 0xFF);
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b[offset++] = (byte) ((v >> 16) & 0xFF);
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b[offset] = (byte) ((v >> 24) & 0xFF);
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}
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/**
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* get a int from a byte array start from the specifiled offset
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*
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* @param b
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* @param offset
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*/
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public static long getIntLong(byte[] b, int offset) {
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return (
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((b[offset++] & 0x000000FFL)) |
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((b[offset++] << 8) & 0x0000FF00L) |
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((b[offset++] << 16) & 0x00FF0000L) |
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((b[offset] << 24) & 0xFF000000L)
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);
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}
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/**
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* get a int from a byte array start from the specifield offset
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*
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* @param b
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* @param offset
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*/
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public static int getInt3(byte[] b, int offset) {
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return (
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(b[offset++] & 0x000000FF) |
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(b[offset++] & 0x0000FF00) |
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(b[offset] & 0x00FF0000)
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);
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}
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public static int getInt2(byte[] b, int offset) {
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return (
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(b[offset++] & 0x000000FF) |
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(b[offset] & 0x0000FF00)
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);
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}
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public static int getInt1(byte[] b, int offset) {
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return (
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(b[offset] & 0x000000FF)
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);
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}
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/**
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* string ip to long ip
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*
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* @param ip
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* @return long
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*/
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public static long ip2long(String ip) {
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String[] p = ip.split("\\.");
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if (p.length != 4) {
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return 0;
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}
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int p1 = ((Integer.valueOf(p[0]) << 24) & 0xFF000000);
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int p2 = ((Integer.valueOf(p[1]) << 16) & 0x00FF0000);
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int p3 = ((Integer.valueOf(p[2]) << 8) & 0x0000FF00);
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int p4 = ((Integer.valueOf(p[3]) << 0) & 0x000000FF);
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return ((p1 | p2 | p3 | p4) & 0xFFFFFFFFL);
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}
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/**
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* int to ip string
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*
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* @param ip
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* @return string
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*/
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public static String long2ip(long ip) {
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StringBuilder sb = new StringBuilder();
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sb
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.append((ip >> 24) & 0xFF).append('.')
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.append((ip >> 16) & 0xFF).append('.')
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.append((ip >> 8) & 0xFF).append('.')
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.append((ip >> 0) & 0xFF);
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return sb.toString();
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}
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}
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