将一组字符串转换为byte []数组 [英] Converting a set of strings to a byte[] array

问题描述

我正在尝试将一组字符串转换为byte []数组.首先，我要做这样的事情将字节数组转换为字符串:

I am tring to convert a set of strings to a byte[] array. At first, I do something like this to convert a byte array to a string:

public String convertByte(byte[] msg) {
    String str = "";        
    for(int i = 0; i < msg.length; i++) {
        str += (msg[i] + " * ");
    }       
    return str;
}

当我尝试转换回byte []数组时，得到的值与转换为String时的值不同.我最初有一些东西给了我不正确的值.

When I try to convert back to the byte[] array, I don't get the same values as the ones when converted to a String. I originally had something gave me incorrect values.

我目前正在尝试以下方法:

I am currently trying something along the lines of:

public static byte[] convertStr(String ln)
{
    System.out.println(ln);

    String[] st = ln.split(" * ");
    byte[] byteArray = new byte[23];
    for(int i = 0; i < st.length; i++)
    {
        byteArray[i] = st[i].get byte value or something;
    }

    return byteArray;
}

如果我尝试使用String api中的getbytes()方法，它将返回一个字节数组而不是一个字节，这是我的问题.

If I try to use the getbytes() method from the String api, It returns a byte array rather than a byte and this is my problem.

任何帮助将不胜感激.

推荐答案

这应该有效:

This should work:

byte[] bytes = "Hello World".getBytes("UTF-8");
String hello = new String(bytes, "UTF-8");

以上示例使用UTF-8编码，仅作为示例.在消息输入中使用您期望的字符编码.(此答案"不是问题的答案...)

The above example uses the UTF-8 encoding and just serves as an example. Use the character encoding you expect in your message input. (This 'answer' wasn't an answer to the question...)

修改

因此，我们需要从byte []到String并再返回到byte []的转换. me123在值之间(和前面)添加了定界符.正如其他人已经解释的那样， 1.拆分的正则表达式必须为" \\* "并且 2.魔术方法是Byte.parseByte(st[i])

So we need a conversion from byte[] to String and back to byte[]. me123 added delimiters between the (and in front of) the values. As others already explained, 1. the regexp for the split has to be " \\* " and 2. the magic method is Byte.parseByte(st[i])

这是不使用定界符的替代方法，但修复了字节条目的宽度. StringToByte转换器仅基于字符串char数组显示了一种非常快速的解决方案.

Here is an alternative without using a delimiter but a fixes width for the byte entries. The StringToByte converter shows a pretty fast solution just based on the strings char array.

public static String convertByte(byte[] msg) {
    StringBuilder sb = new StringBuilder();
    for (byte b:msg) {
        sb.append(String.format("%02x", b));
    }
    return sb.toString();
}

public static byte[] convertStr(String ln)
{
    System.out.println(ln);
    char[] chars = ln.toCharArray();
    byte[] result = new byte[ln.length()/2];
    for (int i = 0;i < result.length; i++) {
        result[i] = (byte) hexToInt(chars[2*i], chars[2*i+1]);
    }

    return result;
}

private static int hexToInt(char c1, char c2) { 
    return ((c1 <= '9' ? c1 - '0':c1 - 'a'+10) << 4) 
           + (c2 <= '9' ? c2 - '0':c2 - 'a'+10);
}

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