Base64编码德code在C＃或Java [英] Base64 decode in C# or Java

问题描述

我有一个Base64-CN $ C与下面的头$ CD对象：

I have a Base64-encoded object with the following header:

application/x-xfdl;content-encoding="asc-gzip"

什么是对象解码进行的最佳方式？我是否需要剥离的第一线？另外，如果我把它变成一个字节数组（字节[]），我怎么取消gzip压缩吗？

What is the best way to proceed in decoding the object? Do I need to strip the first line? Also, if I turn it into a byte array (byte[]), how do I un-gzip it?

谢谢！

我想我最初说错。说头是

I think I misspoke initially. By saying the header was

application/x-xfdl;content-encoding="asc-gzip"

我的意思，这是该文件的第一行。因此，为了使用Java或C＃库去code中的文件，做这一行需要被剥离？

I meant this was the first line of the file. So, in order to use the Java or C# libraries to decode the file, does this line need to be stripped?

如果是这样，这将是剥离的第一行最简单的方法？

If so, what would be the simplest way to strip the first line?

推荐答案

我可以使用下面的code到.xfdl文档转换为Java DOM文档。

I was able to use the following code to convert an .xfdl document into a Java DOM Document.

我用 iHarder的 Base64的实用程序执行的Base64德code。

I used iHarder's Base64 utility to do the Base64 Decode.

private static final String FILE_HEADER_BLOCK = 
        "application/vnd.xfdl;content-encoding=\"base64-gzip\"";  

    public static Document OpenXFDL(String inputFile) 
            throws IOException, 
                ParserConfigurationException,
                SAXException

    {
        try{

            //create file object
            File f = new File(inputFile);
            if(!f.exists()) {
                throw new IOException("Specified File could not be found!");
            }

            //open file stream from file
            FileInputStream fis = new FileInputStream(inputFile);

            //Skip past the MIME header
            fis.skip(FILE_HEADER_BLOCK.length());   

            //Decompress from base 64                   
            Base64.InputStream bis = new Base64.InputStream(fis, 
                    Base64.DECODE);

            //UnZIP the resulting stream
            GZIPInputStream gis = new GZIPInputStream(bis);

            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(gis);

            gis.close();
            bis.close();
            fis.close();

            return doc;
        }
        catch (ParserConfigurationException pce) {
            throw new ParserConfigurationException("Error parsing XFDL from file.");
        }
        catch (SAXException saxe) {
            throw new SAXException("Error parsing XFDL into XML Document.");
        }
    }

仍在努力成功地修改和重新编码的文件。

Still working on successfully modifying and re-encoding the document.

希望这有助于。

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