1 十六进制字符串转字节数组方法
/**
* 16进制表示的字符串转换为字节数组
*
* @param hexString 16进制表示的字符串
* @return byte[] 字节数组
*/
public static byte[] hexStringToByteArray(String hexString) {
hexString = hexString.replaceAll(” “, “”);
int len = hexString.length();
byte[] bytes = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
// 两位一组，表示一个字节,把这样表示的16进制字符串，还原成一个字节
bytes[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character
.digit(hexString.charAt(i+1), 16));
}
return bytes;
}
/**
* 16进制的字符串表示转成字节数组
*
* @param hexString 16进制格式的字符串
* @return 转换后的字节数组
**/
public static byte[] toByteArray(String hexString) {
hexString = hexString.replaceAll(” “, “”);
final byte[] byteArray = new byte[hexString.length() / 2];
int k = 0;
for (int i = 0; i < byteArray.length; i++) {//因为是16进制，最多只会占用4位，转换成字节需要两个16进制的字符，高位在先
byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
byteArray[i] = (byte) (high << 4 | low);
k += 2;
}
return byteArray;
}
2 字节数组转16进制字符串
/**
* byte[]数组转换为16进制的字符串
*
* @param bytes 要转换的字节数组
* @return 转换后的结果
*/
public static String bytesToHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
String hex = Integer.toHexString(0xFF & bytes[i]);
if (hex.length() == 1) {
sb.append(‘0’);
}
sb.append(hex);
}
return sb.toString();
}
/**
* byte[]数组转换为16进制的字符串
*
* @param data 要转换的字节数组
* @return 转换后的结果
*/
public static final String byteArrayToHexString(byte[] data) {
StringBuilder sb = new StringBuilder(data.length * 2);
for (byte b : data) {
int v = b & 0xff;
if (v < 16) {
sb.append(‘0’);
}
sb.append(Integer.toHexString(v));
}
return sb.toString().toUpperCase(Locale.getDefault());
}
/**
* 字节数组转成16进制表示格式的字符串
*
* @param byteArray 要转换的字节数组
* @return 16进制表示格式的字符串
**/
public static String toHexString(byte[] byteArray) {
if (byteArray == null || byteArray.length < 1)
throw new IllegalArgumentException(“this byteArray must not be null or empty”);
final StringBuilder hexString = new StringBuilder();
for (int i = 0; i < byteArray.length; i++) {
if ((byteArray[i] & 0xff) < 0x10)//0~F前面不零
hexString.append(“0”);
hexString.append(Integer.toHexString(0xFF & byteArray[i]));
}
return hexString.toString().toLowerCase();
}
转自：https://blog.csdn.net/u010331406/article/details/49640677