[英]C# to Java: Base64String, MemoryStream, GZipStream
I have a Base64 string that's been gzipped in .NET and I would like to convert it back into a string in Java. 我有一个在.NET中压缩过的Base64字符串,我想将其转换回Java中的字符串。 I'm looking for some Java equivalents to the C# syntax, particularly:
我正在寻找与C#语法等效的Java,尤其是:
Here's the method I'd like to convert: 这是我想转换的方法:
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);
}
}
Any pointers are appreciated. 任何指针表示赞赏。
For Base64, you have the Base64
class from Apache Commons, and the decodeBase64
method which takes a String
and returns a byte[]
. 对于Base64,您可以使用Apache Commons的
Base64
类 ,还可以使用采用String
并返回byte[]
的decodeBase64
方法。
Then, you can read the resulting byte[]
into a ByteArrayInputStream
. 然后,您可以将结果
byte[]
读入ByteArrayInputStream
。 At last, pass the ByteArrayInputStream
to a GZipInputStream and read the uncompressed bytes. 最后,将
ByteArrayInputStream
传递给GZipInputStream并读取未压缩的字节。
The code looks like something along these lines: 这些代码看起来类似于以下几行:
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. 我没有测试代码,但是我认为它应该可以工作,可能需要进行一些修改。
For Base64, I recommend iHolder's implementation . 对于Base64,我建议使用iHolder的实现 。
GZipinputStream is what you need to decompress a GZip byte array. GZipinputStream是解压缩GZip字节数组所需的。
ByteArrayOutputStream is what you use to write out bytes to memory. ByteArrayOutputStream是用于将字节写出到内存中的东西。 You then get the bytes and pass them to the constructor of a string object to convert them, preferably specifying the encoding.
然后,您获取字节并将它们传递给字符串对象的构造函数以进行转换,最好指定编码。
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