java字符串和十六進制字符串互轉(zhuǎn)
public class HexStringUtils {
private static final char[] DIGITS_HEX = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
'E', 'F' };
protected static char[] encodeHex(byte[] data) {
int l = data.length;
char[] out = new char[l << 1];
for (int i = 0, j = 0; i < l; i++) {
out[j++] = DIGITS_HEX[(0xF0 & data[i]) >>> 4];
out[j++] = DIGITS_HEX[0x0F & data[i]];
}
return out;
}
protected static byte[] decodeHex(char[] data) {
int len = data.length;
if ((len & 0x01) != 0) {
throw new RuntimeException("字符個數(shù)應該為偶數(shù)");
}
byte[] out = new byte[len >> 1];
for (int i = 0, j = 0; j < len; i++) {
int f = toDigit(data[j], j) << 4;
j++;
f |= toDigit(data[j], j);
j++;
out[i] = (byte) (f & 0xFF);
}
return out;
}
protected static int toDigit(char ch, int index) {
int digit = Character.digit(ch, 16);
if (digit == -1) {
throw new RuntimeException("Illegal hexadecimal character " + ch + " at index " + index);
}
return digit;
}
public static String toHex(String str) {
return new String(encodeHex(str.getBytes()));
}
public static String fromHex(String hex) {
return new String(decodeHex(hex.toCharArray()));
}
public static void main(String[] args) {
String s = "abc你好";
String hex = toHex(s);
String decode = fromHex(hex);
System.out.println("原字符串:" + s);
System.out.println("十六進制字符串:" + hex);
System.out.println("還原:" + decode);
}
}
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