如何将Java字符串转换为字节[]?

2022-01-31 00:00:00 string arrays java

有没有办法将Java String 转换为 byte[] (不是盒装的 Byte[])?

Is there any way to convert Java String to a byte[] (not the boxed Byte[])?

在尝试这个:

System.out.println(response.split("

")[1]);
System.out.println("******");
System.out.println(response.split("

")[1].getBytes().toString());

我得到了单独的输出.无法显示第一个输出，因为它是 gzip 字符串.

and I'm getting separate outputs. Unable to display 1st output as it is a gzip string.

<A Gzip String>
******
[B@38ee9f13

第二个是地址.有什么我做错了吗?我需要将 byte[] 中的结果提供给 gzip 解压缩器，如下所示.

The second is an address. Is there anything I'm doing wrong? I need the result in a byte[] to feed it to gzip decompressor, which is as follows.

String decompressGZIP(byte[] gzip) throws IOException {
    java.util.zip.Inflater inf = new java.util.zip.Inflater();
    java.io.ByteArrayInputStream bytein = new java.io.ByteArrayInputStream(gzip);
    java.util.zip.GZIPInputStream gzin = new java.util.zip.GZIPInputStream(bytein);
    java.io.ByteArrayOutputStream byteout = new java.io.ByteArrayOutputStream();
    int res = 0;
    byte buf[] = new byte[1024];
    while (res >= 0) {
        res = gzin.read(buf, 0, buf.length);
        if (res > 0) {
            byteout.write(buf, 0, res);
        }
    }
    byte uncompressed[] = byteout.toByteArray();
    return (uncompressed.toString());
}

推荐答案

你的方法 decompressGZIP() 需要的对象是 byte[].

The object your method decompressGZIP() needs is a byte[].

因此，您所提问题的基本技术答案是:

So the basic, technical answer to the question you have asked is:

byte[] b = string.getBytes();
byte[] b = string.getBytes(Charset.forName("UTF-8"));
byte[] b = string.getBytes(StandardCharsets.UTF_8); // Java 7+ only

<小时>

但是，您似乎遇到的问题是它的显示效果不是很好.调用 toString() 只会为您提供默认的 Object.toString()，即类名 + 内存地址.在您的结果 [B@38ee9f13 中，[B 表示 byte[] 并且 38ee9f13 是内存地址，由 @ 分隔.

However the problem you appear to be wrestling with is that this doesn't display very well. Calling toString() will just give you the default Object.toString() which is the class name + memory address. In your result [B@38ee9f13, the [B means byte[] and 38ee9f13 is the memory address, separated by an @.

出于显示目的，您可以使用:

For display purposes you can use:

Arrays.toString(bytes);

但这只会显示为逗号分隔的整数序列，这可能是也可能不是您想要的.

But this will just display as a sequence of comma-separated integers, which may or may not be what you want.

要从 byte[] 中获取可读的 String，请使用:

To get a readable String back from a byte[], use:

String string = new String(byte[] bytes, Charset charset);

<小时>

Charset 版本受到青睐的原因是，Java 中的所有 String 对象都在内部存储为 UTF-16.转换为 byte[] 时，您将获得该 String 的给定字形的不同字节细分，具体取决于所选的字符集.

The reason the Charset version is favoured, is that all String objects in Java are stored internally as UTF-16. When converting to a byte[] you will get a different breakdown of bytes for the given glyphs of that String, depending upon the chosen charset.

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