java - 获取 javax.xml.stream.XMLStreamReader 读入的字节数

Question

有没有办法获取 XMLStreamReader 读取的字节数，我使用的是 java.io.FileReader，它被传递到创建 xml 读取器的工厂中。我怀疑 XMLStreamReader 是否可以实现这一点，但任何解决方法都很棒。

Answer 1

假设你正在做这样的事情:

final XMLInputFactory inputFactory;
final XMLStreamReader reader;
final InputStream     stream;

inputFactory = XMLInputFactory.newInstance();
stream       = new FileInputStream(file);
reader       = inputFactory.createXMLStreamReader(stream);

你会做这样的事情:

final XMLInputFactory     inputFactory;
final XMLStreamReader     reader;
final InputStream         stream;
final CountingInputStream countingStream;

inputFactory   = XMLInputFactory.newInstance();
stream         = new FileInputStream(file);
countingStream = new CountingStream(stream);
reader         = inputFactory.createXMLStreamReader(countingStream);

其中 CoutingInputStream 是一个您需要编写/查找的类，用于跟踪从底层 InputStream 对象读取的字节数。