字符串数组来六角阵列（JAVA） [英] String array to Hex Array (Java)

问题描述

我有一个实际上是由十六进制字符的字符串数组。

I have a String array that actually consists of Hex characters.

让我们说的内容 - >

Let's say the contents are ->

String array[] = {8C,D9,26,1D,69,B7,96,DB};  

现在我想这是作为PTED 1个字节的十六进制字符每个，而不是作为一个字符串，其中每个条目为2个字节。除$ P $

Now I want these to be interpreted as Hex characters of 1 byte each and not as a String where each entry is 2 bytes.

StringBuilder output = new StringBuilder();
for (int j = 0; j < array.length; j++) {
        String temp = "\u00"+ array[j];
        output.append(temp);
    }

试过类似的东西，而是因为它一直在抱怨非法UNI code转义这是不可能的。我尝试使用\\ U00（即ü前两个反斜杠，但计算器只能显示一个有），而不是\\ U00要解决这个问题的错误，但我没有看到数组中的真正的十六进制值，而不是我看到一堆像琴弦 - >\\ U008C，\\ U00D9等。

Tried something like that, but it's not possible because it keeps complaining about "illegal unicode escape". I tried using "\u00" (i.e. two backslashes before u, but stackoverflow displays only one there) instead of "\u00" to get around that error, but then I don't see the real Hex values in the array, instead I see a bunch of strings like -> "\U008C" , "\U00D9" and so on..

我想转换后的值是0x8C，0xD9，值为0x26 ...

I want the after conversion values to be 0x8C, 0xD9, 0x26...

感谢。

编辑：我已经更新的问题，我只想澄清有数组本身没有逗号。而最终我需要把所有这些值加在一起，并使用它作为一个HMAC密钥是一个十六进制字符串而不是一个文本字符串。

I have updated the question, just to clarify there were no commas in the array itself. And eventually I need to put all those values together, and use that as a HMAC key that is a hex string and NOT a text string.

推荐答案

让JDK为你做的工作：

Let the JDK do the work for you:

String[] array = {"8C", "D9", "26", "1D", "69", "B7", "96", "DB"};

StringBuilder output = new StringBuilder();
for ( String hex : array ) {
    output.append( (char)Integer.parseInt( hex, 16 ) );
}

基本上只是循环内一行是你所需要的。

Basically just that one line inside the loop is all you need.

如果你想你的投入只是一个大的字符串（这似乎更方便），只是这样做，而不是：

If you wanted your input to be just one big String (which would seem more convenient), just do this instead:

String input = "8CD9261D69B796DB";

StringBuilder output = new StringBuilder();
for ( String hex : input.replaceAll( "..(?!$)", "$0," ).split( "," ) ) {
    output.append( (char)Integer.parseInt( hex, 16 ) );
}

编辑：

如果你想的byte []的结果，这样做：

Edited:

If you want byte[] result, do this:

String[] array = {"8C", "D9", "26", "1D", "69", "B7", "96", "DB"};

byte[] bytes = new byte[array.length];
for ( int i = 0; i < array.length; i++ ) {
    bytes[i] = (byte)Integer.parseInt( array[i], 16 );
}

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