如何使用xstream读取xml中的注释 [英] how to read comments in xml using xstream
问题描述
是否可以使用XStream和Java在解析XML注释时读取XML注释。
Is there a way to read xml comments while parsing it using XStream with Java.
<!--
Mesh: three-dimensional box 100m x 50m x 50m Created By Sumit Purohit on
for a stackoverflow query.
-->
<ParameterList name="Mesh">
<Parameter name="Domain Low Corner" type="Array double" value="{0.0, 0.0, 0.0}" />
<Parameter name="Domain High Corner" type="Array double" value="{100.0, 50.0,50.0}" />
</ParameterList>
我目前使用XStream对上述类型的xml进行序列化/反序列化。我需要将注释作为注释保存在POJO上,以便可以在UI中显示。
I currently use XStream to serialize/ de-serialize kind of xml above. I need to save comments as annotations on my POJO so that i can show it in UI.
在XStream中我找不到任何内容。
I could not find anything in XStream for that.
DOM具有 DocumentBuilderFactory.setIgnoringComments(boolean),可让您在DOM树中包含注释,并且可以区分节点的类型。
DOM has DocumentBuilderFactory.setIgnoringComments(boolean) that let you include comments in the DOM tree and you can distinguish between type of Nodes.
类似地,C#具有 XmlReaderSettings.IgnoreComments
推荐答案
XStream无法处理XML注释。
XStream can not process XML comments to my knowledge.
这里是另一种方法,它使用LexicalHandler API:
Here is another approach, which uses the LexicalHandler API:
import org.xml.sax.*;
import org.xml.sax.ext.*;
import org.xml.sax.helpers.*;
import java.io.IOException;
public class ReadXMLFile implements LexicalHandler {
public void startDTD(String name, String publicId, String systemId)
throws SAXException {
}
public void endDTD() throws SAXException {
}
public void startEntity(String name) throws SAXException {
}
public void endEntity(String name) throws SAXException {
}
public void startCDATA() throws SAXException {
}
public void endCDATA() throws SAXException {
}
public void comment(char[] text, int start, int length)
throws SAXException {
System.out.println("Comment: " + new String(text, start, length));
}
public static void main(String[] args) {
// set up the parser
XMLReader parser;
try {
parser = XMLReaderFactory.createXMLReader();
} catch (SAXException ex1) {
try {
parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
} catch (SAXException ex2) {
return;
}
}
try {
parser.setProperty("http://xml.org/sax/properties/lexical-handler",new ReadXMLFile()
);
} catch (SAXNotRecognizedException e) {
System.out.println(e.getMessage());
return;
} catch (SAXNotSupportedException e) {
System.out.println(e.getMessage());
return;
}
try {
parser.parse("xmlfile.xml"); // <---- Path to XML file
} catch (SAXParseException e) { // well-formedness error
System.out.println(e.getMessage());
} catch (SAXException e) {
System.out.println(e.getMessage());
} catch (IOException e) {
}
}
}
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