ConvertUtils.java
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package com.sunvote.utils;
/**
* Created by Elvis on 2017/8/11.
* Email:Eluis@psunsky.com
* Description:
* 16进制工具类
*/
public class ConvertUtils {
static final char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
private ConvertUtils(){
throw new UnsupportedOperationException("No Impl");
}
/**
* 每1个byte转为2个hex字符
* <p>例如：</p>
* bytes2HexString(new byte[] { 0, (byte) 0xa8 }) returns 00A8
*
* @param src byte数组
* @return 16进制大写字符串
*/
public static String bytes2HexString(byte[] src) {
char[] res = new char[src.length << 1];
for (int i = 0, j = 0; i < src.length; i++) {
res[j++] = hexDigits[src[i] >>> 4 & 0x0f];
res[j++] = hexDigits[src[i] & 0x0f];
}
return new String(res);
}
/**
* 每2个hex字符转为1个byte
* <p>例如：</p>
* hexString2Bytes("00A8") returns { 0, (byte) 0xA8 }
*
* @param hexString 十六进制字符串
* @return byte数组
*/
public static byte[] hexString2Bytes(String hexString) {
int len = hexString.length();
if (len % 2 != 0) {
throw new IllegalArgumentException("长度不是偶数");
}
char[] hexBytes = hexString.toUpperCase().toCharArray();
byte[] res = new byte[len >>> 1];
for (int i = 0; i < len; i += 2) {
res[i >> 1] = (byte) (hex2Dec(hexBytes[i]) << 4 | hex2Dec(hexBytes[i + 1]));
}
return res;
}
/**
* 单个hex字符转为10进制
*
* @param hexChar hex单个字节
* @return 0..15
*/
private static int hex2Dec(char hexChar) {
if (hexChar >= '0' && hexChar <= '9') {
return hexChar - '0';
} else if (hexChar >= 'A' && hexChar <= 'F') {
return hexChar - 'A' + 10;
} else {
throw new IllegalArgumentException();
}
}
/**
* charArr转byteArr
*
* @param chars 待转的char数组
* @return byte数组
*/
public static byte[] chars2Bytes(char[] chars) {
int len = chars.length;
byte[] bytes = new byte[len];
for (int i = 0; i < len; i++) {
bytes[i] = (byte) (chars[i]);
}
return bytes;
}
/**
* byteArr转charArr
*
* @param bytes 待转的byte数组
* @return char数组
*/
public static char[] bytes2Chars(byte[] bytes) {
int len = bytes.length;
char[] chars = new char[len];
for (int i = 0; i < len; i++) {
chars[i] = (char) (bytes[i] & 0xff);
}
return chars;
}
}