hexstring java_HexString与Byte数组相互转换--Java实现

package cn.myjava.utils;

import org.apache.commons.lang3.StringUtils;

/**

* @author YPF

*/

public class FileInfoUtil {

/**

* 将byte数组转换成string类型表示

* @param src

* @return

*/

private static String bytesToHexString(byte[] src) {

StringBuilder builder = new StringBuilder();

if (src == null || src.length <= 0) {

return null;

}

String hv;

for (int i = 0; i < src.length; i++) {

// 以十六进制(基数 16)无符号整数形式返回一个整数参数的字符串表示形式，并转换为大写

hv = Integer.toHexString(src[i] & 0xFF).toUpperCase();

if (hv.length() < 2) {

builder.append(0);

}

builder.append(hv);

}

return builder.toString();

}

/**

* 将Hex String转换为Byte数组

*

* @param hexString the hex string

* @return the byte [ ]

*/

public static byte[] hexStringToBytes(String hexString) {

if (StringUtils.isEmpty(hexString)) {

return null;

}

hexString = hexString.toLowerCase();

final byte[] byteArray = new byte[hexString.length() >> 1];

int index = 0;

for (int i = 0; i < hexString.length(); i++) {

if (index > hexString.length() - 1) {

return byteArray;

}

byte highDit = (byte) (Character.digit(hexString.charAt(index), 16) & 0xFF);

byte lowDit = (byte) (Character.digit(hexString.charAt(index + 1), 16) & 0xFF);

byteArray[i] = (byte) (highDit << 4 | lowDit);

index += 2;

}

return byteArray;

}

}