Hex.java

package org.springframework.security.crypto.codec;

  //...
  private static final char[] HEX = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f' };

  public static char[] encode(byte[] bytes) {
    final int nBytes = bytes.length;
    char[] result = new char[2 * nBytes];         //  1 hex contains two chars
                                                  //  hex = [0-f][0-f], e.g 0f or ff

    int j = 0;
    for (byte aByte : bytes) {                    // loop byte by byte

                                                  // 0xF0 = FFFF 0000
      result[j++] = HEX[(0xF0 & aByte) >>> 4];    // get the top 4 bits, first half hex char

                                                  // 0x0F = 0000 FFFF
      result[j++] = HEX[(0x0F & aByte)];          // get the bottom 4 bits, second half hex char

                                                  // combine first and second half, we get a complete hex
    }

    return result;
  }

【 在 PlutoKey 的大作中提到: 】
: md5得到的字节数组byte[]，如何转成hex十六进制字符串String？
: md5取摘要，得到了一个128位/16字节的数组 byte[]，
: 需要再转换成一个32个字符的十六进制字符串 String。
: ...................
--
FROM 223.104.119.*