javax StreamSource 的目的是什么
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/18538288/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
what is the purpose of javax StreamSource
提问by Ted
I am parsing an xml document being read in as an InputStream, and an exampleI've seen first stages the stream in a javax.xml.transform.stream.StreamSource. Why do this when I can parse the stream as it's read in? The Java API's descriptionisn't helpful: "Acts as a holder for a transformation Source in the form of a stream of XML markup."
我正在解析作为 InputStream 读入的 xml 文档，并且我看到的一个示例首先将流置于 javax.xml.transform.stream.StreamSource 中。当我可以解析读入的流时，为什么要这样做？Java API 的描述没有帮助：“作为 XML 标记流形式的转换源的持有者。”
Example with StreamSource:
StreamSource 示例：
XMLInputFactory xif = XMLInputFactory.newFactory();
StreamSource reportStream =
new StreamSource(new URL("file:///myXmlDocURL.xml").openStream());
XMLStreamReader xmlReader = xif.createXMLStreamReader(reportStream);
xmlReader.nextTag();
while (xmlReader.hasNext()) {
if (xmlReader.getLocalName().equals("attributeICareAbout")) {
String tempTagValue = xmlReader.getText();
xmlReader.nextTag();
}
}
xmlReader.close();
Example without StreamSource:
没有 StreamSource 的示例：
XMLInputFactory xif = XMLInputFactory.newFactory();
XMLStreamReader xmlReader =
xif.createXMLStreamReader(new URL("file:///myXmlDocURL.xml").openStream());
xmlReader.nextTag();
while (xmlReader.hasNext()) {
if (xmlReader.getLocalName().equals("attributeIcareAbout")) {
String tempTagValue = xmlReader.getText();
xmlReader.nextTag();
}
}
xmlReader.close();
采纳答案by Henry
It is an abstraction so that the same parsing code can be used for a variety of sources (note: StreamSourceimplements Source):
它是一种抽象，因此相同的解析代码可用于各种来源（注意： StreamSource实现Source）：
- XMLInputFactory.createXMLStreamReader(Source)
- Validator.validate(Source)
- Transformer.transfrom(Source, Result)
- Unmarshaller.unmarshal(Source, Class)
- XMLInputFactory.createXMLStreamReader(Source)
- Validator.validate（来源）
- Transformer.transfrom（来源，结果）
- Unmarshaller.unmarshal（来源，类）
Getting XML from a file is just one possibility. There are also implementations of Sourcefor DOM (DOMSource), SAX (SAXSource), StAX (StAXSource), and JAXB (JAXBSource).
从文件中获取 XML 只是一种可能性。还有Sourcefor DOM( DOMSource)、SAX( SAXSource)、StAX( StAXSource) 和 JAXB( JAXBSource) 的实现。
