C＃与Java：Base64String，MemoryStream的，GZipStream [英] C# to Java: Base64String, MemoryStream, GZipStream

问题描述

我有一个在.NET中被gzip压缩的一个Base64字符串，我想将其转换回Java中的字符串。我在寻找一些Java等效于C＃语法，尤其是：

I have a Base64 string that's been gzipped in .NET and I would like to convert it back into a string in Java. I'm looking for some Java equivalents to the C# syntax, particularly:

• Convert.FromBase64String


• 的MemoryStream


• GZipStream

下面是我想转换的方法：

Here's the method I'd like to convert:

public static string Decompress(string zipText) {
    byte[] gzipBuff = Convert.FromBase64String(zipText);

    using (MemoryStream memstream = new MemoryStream())
    {
        int msgLength = BitConverter.ToInt32(gzipBuff, 0);
        memstream.Write(gzipBuff, 4, gzipBuff.Length - 4);

        byte[] buffer = new byte[msgLength];

        memstream.Position = 0;
        using (GZipStream gzip = new GZipStream(memstream, CompressionMode.Decompress))
        {
            gzip.Read(buffer, 0, buffer.Length);
        }
        return Encoding.UTF8.GetString(buffer);
     }
}

任何指针赞赏。

Any pointers are appreciated.

推荐答案

有关Base64的，你有的Base64 的来自Apache下议院类，而 decodeBase64 方法，它需要一个字符串并返回字节[] 。

For Base64, you have the Base64 class from Apache Commons, and the decodeBase64 method which takes a String and returns a byte[].

然后，您可以读取结果字节[] 成的 ByteArrayInputStream的 。最后，通过 ByteArrayInputStream的到 GZipInputStream 并读取压缩字节。

Then, you can read the resulting byte[] into a ByteArrayInputStream. At last, pass the ByteArrayInputStream to a GZipInputStream and read the uncompressed bytes.

代码看起来像这些方针的东西：

The code looks like something along these lines:

public static String Decompress(String zipText) throws IOException {
    byte[] gzipBuff = Base64.decodeBase64(zipText);

    ByteArrayInputStream memstream = new ByteArrayInputStream(gzipBuff);
    GZIPInputStream gzin = new GZIPInputStream(memstream);

    final int buffSize = 8192;
    byte[] tempBuffer = new byte[buffSize ];
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    while ((size = gzin.read(tempBuffer, 0, buffSize)) != -1) {
        baos.write(tempBuffer, 0, size);
    }        
    byte[] buffer = baos.toByteArray();
    baos.close();

    return new String(buffer, "UTF-8");
}

我没有测试代码，但我认为它应该工作，也许有一些修改。

I didn't test the code, but I think it should work, maybe with a few modifications.

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