C# 到 Java：Base64String、MemoryStream、GZipStream

发布于 2024-08-04 14:52:05 字数 820 浏览 3 评论 0原文

我有一个在 .NET 中压缩的 Base64 字符串，我想将其转换回 Java 中的字符串。我正在寻找一些与 C# 语法等效的 Java 语法，特别是：

Convert.FromBase64String
MemoryStream
GZipStream

这是我想要转换的方法：

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);
     }
}

任何指针都值得赞赏。

原文

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
MemoryStream
GZipStream

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);
     }
}

Any pointers are appreciated.

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天邊彩虹 2024-08-11 14:52:05

对于 Base64，您有 Base64 class，以及采用 String 并返回 byte[] 的 decodeBase64 方法。

然后，您可以将生成的 byte[] 读入 ByteArrayInputStream。最后，将 ByteArrayInputStream 传递给 GZipInputStream 并读取未压缩的字节。

代码看起来像这样：

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，但我认为它应该可以工作，也许需要一些修改。

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

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

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");
}

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

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