如何将Java String转换为byte []？ [英] How to convert Java String into byte[]?

问题描述

有没有办法将Java String 转换为 byte [] （ not 盒装的 Byte [] ）？

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

尝试这个：

System.out.println(response.split("\r\n\r\n")[1]);
System.out.println("******");
System.out.println(response.split("\r\n\r\n")[1].getBytes().toString());

我正在获得单独的输出。无法显示第一个输出，因为它是一个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

第二个是一个地址。有什么我做错了吗？我需要在 byte [] 中将结果提供给gzip decompressor，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

你的方法对象 decompressGZIP（）需求是 byte [] 。

所以您提出的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

---

但问题是你看似摔跤的是，这显示得不是很好。调用 toString（）将只提供默认的 Object.toString（），这是类名+内存地址。在您的结果 [B @ 38ee9f13 中， [B 表示 byte [] 和 38ee9f13 是内存地址，以 @ 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，可能是也可能不是你想要的。

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

从字节[]中获取可读的字符串 ，使用：

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

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

---

Charset的原因版本受到青睐，Java中的所有 String 对象都在内部存储为UTF-16。当转换为 byte [] 时，您将获得该 String 的给定字形的不同字节细分，具体取决于在选择的字符集上。

---

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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