com.gitee.apanlh.util.encode.OctUtils Maven / Gradle / Ivy
package com.gitee.apanlh.util.encode;
/**
* 八进制
*
* @author Pan
*/
public class OctUtils {
private static final int LONG_BYTES = 8;
private static final String OCT_DIGITS = "01234567";
private OctUtils() {
super();
}
public static String toOctalString(long l) {
StringBuilder sb = new StringBuilder();
byte[] bytes = toByteArray(l);
for (int i = 0; i < bytes.length; i++) {
sb.append(OCT_DIGITS.charAt((bytes[i] & 0xff) >> 3));
sb.append(OCT_DIGITS.charAt((bytes[i] & 0xff) >> 2));
sb.append(OCT_DIGITS.charAt((bytes[i] & 0xff) >> 1));
sb.append(OCT_DIGITS.charAt((bytes[i] & 0xff) >> 0));
}
return sb.toString();
}
public static String toOctalString(Long l) {
if (l == null) {
return null;
}
return toOctalString(l.longValue());
}
public static String toOctalString(int i) {
return toOctalString((long) i);
}
public static String toOctalString(Integer i) {
if (i == null) {
return null;
}
return toOctalString((long) i.intValue());
}
public static String toOctalString(short s) {
return toOctalString((long) s);
}
public static String toOctalString(Short s) {
if (s == null) {
return null;
}
return toOctalString((long) s.shortValue());
}
public static String toOctalString(byte b) {
return toOctalString((long) b);
}
public static String toOctalString(Byte b) {
if (b == null) {
return null;
}
return toOctalString((long) b.byteValue());
}
/**
* 该方法将一个 long 类型的数字转换成一个字节数组，每个字节的值表示原来的 long 类型数字的八位二进制数字。
*
* @author Pan
* @param l long
* @return byte[]
*/
private static byte[] toByteArray(long l) {
byte[] bytes = new byte[LONG_BYTES];
for (int i = 0; i < LONG_BYTES; i++) {
bytes[i] = (byte) ((l >> (LONG_BYTES - i - 1) * 8) & 0xff);
}
return bytes;
}
}