byte[]字节数组转hex16进制字符串的三种方法

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方法1

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private String bytesToHex(byte[] bytes) {
    String hex = new BigInteger(1, bytes).toString(16);
}

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方法2

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private String bytesToHex(byte[] bytes) {
    StringBuilder sb = new StringBuilder();
    for (byte b : bytes) {
        sb.append(String.format("%02x", b));
    }
    return sb.toString();
}

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方法3

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public String bytesToHex(byte[] bytes) {
   char[] hexDigits = {'0','1','2','3','4','5','6','7','8','9', 'a','b','c','d','e','f'};  
   // 一个字节对应两个16进制数，所以长度为字节数组乘2
   char[] resultCharArray = new char[bytes.length * 2];  
   int index = 0; 
   for (byte b : bytes) {  
      resultCharArray[index++] = hexDigits[b>>>4 & 0xf];  
      resultCharArray[index++] = hexDigits[b & 0xf];  
   }  
   return new String(resultCharArray); 
}

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