我有一个 SAX 的 DefaultHandler的它解析一个InputStream。我不知道有多少元素在XML，所以我不能指望他们对的endElement 或simmilar。 我做知道的字节长度的InputStream （从HTTP头中读出），但我无法找到一个方法来获得当前的按字节的进展的解析过程。

有没有办法让目前的进展（如位处理）的解析过程呢？

这是怎么了的DefaultHandler 被调用：

 的SAXParserFactory厂= SAXParserFactory.newInstance（）;
的SAXParser解析器= factory.newSAXParser（）;
parser.parse（InputStream的，myDefaultHandler）;
 

解决方案

您可以通过编写的 FilterInputStream中的来包装现有的InputStream。在过滤器的阅读（）方法，增加一个计数器，并提供一个getter，这样别的东西可以跟踪当前计数。

由于分析器可以预读，这将是近似的，但它可能是最好的，你可以做的。

I have a SAX DefaultHandler which parses an InputStream. I don't know how many elements are in the XML so I can't count them on endElement or simmilar. I do know the byte length of the InputStream (read from the http header) but I can't find a method to get the current bytewise progress of the parsing process.

Is there a way to get the current progress (i.e. bits processed) of the parsing process?

This is how the DefaultHandler gets called:

SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
parser.parse(inputStream, myDefaultHandler);

You can do this by writing a FilterInputStream to wrap the existing inputStream. In the read() method of your filter, increment a counter, and provide a getter so that something else can track the current count.

Since the parser may read ahead, this will be approximate, but it's probably the best you can do.