方法一：

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/**
   * byte数组转化为16进制字符串
   * @param bytes
   * @return
   */
   public static String byteToHexString(byte[] bytes) {
       StringBuffer sb = new StringBuffer();
   for (int i = 0; i < bytes.length; i++) {
   　　String strHex=Integer.toHexString(bytes[i]);
         if(strHex.length() > 3) {
           sb.append(strHex.substring(6));
      } else {
         if(strHex.length() < 2) {
           sb.append("0" + strHex);
         } else {
           sb.append(strHex);
         }
      }
   }
   return sb.toString();
  }

方法二：

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private static final char HEX_DIGITS[] = "0123456789abcdef".toCharArray();
 
protected static String toHexString(byte[] b) {
    StringBuilder sb = new StringBuilder(b.length * 2);
    for (int i = 0; i < b.length; i++) {
     sb.append(HEX_DIGITS[(b[i] & 0xf0) >>> 4]);
         sb.append(HEX_DIGITS[b[i] & 0x0f]);
   }
   return sb.toString();
}