修改XML文件的时候运行报错！

[lqsmn613]

public class UpdateXML {
	public static void main(String[] args) {
		try {
			SAXReader saxReader = new SAXReader();
			Document doc = saxReader.read(new File("e:/user.xml"));
			List list = doc.selectNodes("users/user/@state");
			Iterator iter = list.iterator();
			while(iter.hasNext()){
				Attribute attribute = (Attribute)iter.next();
				if(attribute.getValue().equals("owner")){
					attribute.setValue("other");
				}
			}
		} catch (DocumentException e) {
			e.printStackTrace();
		}
	}
}

运行报错：
Warning: Caught exception attempting to use SAX to load a SAX XMLReader
Warning: Exception was: java.lang.ClassNotFoundException: org/apache/xerces/parsers/SAXParser
Warning: I will print the stack trace then carry on using the default SAX parser
java.lang.ClassNotFoundException: org/apache/xerces/parsers/SAXParser
at org.xml.sax.helpers.XMLReaderFactory.loadClass(Unknown Source)
at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(Unknown Source)
at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:83)
at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
at org.dom4j.io.SAXReader.read(SAXReader.java:435)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)
org.dom4j.DocumentException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found Nested exception: SAX2 driver class org.apache.xerces.parsers.SAXParser not found
at org.dom4j.io.SAXReader.read(SAXReader.java:484)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)
Nested exception:
java.lang.ClassNotFoundException: org/apache/xerces/parsers/SAXParser
at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:98)
at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
at org.dom4j.io.SAXReader.read(SAXReader.java:435)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)
Nested exception: java.lang.ClassNotFoundException: org/apache/xerces/parsers/SAXParser
at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:98)
at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
at org.dom4j.io.SAXReader.read(SAXReader.java:435)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)

这是什么原因

[st161166]

用UTF-8比较好

[Gkilroy]

这种问题就是缺少API包,下载xerces.jar包,添加到build path.

[lqsmn613]

貌似是这个问题，谢谢啦。
还有个问题，是编码的问题，我前面建XML的时候是设置为“GBK”的。而现在报错，好像是编码的问题。
怎么解决：？
错误：
org.dom4j.DocumentException: Error on line 0 of document : The encoding "GBK" is not supported. Nested exception: The encoding "GBK" is not supported.
at org.dom4j.io.SAXReader.read(SAXReader.java:482)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)
Nested exception:
org.xml.sax.SAXParseException: The encoding "GBK" is not supported.
at org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1196)
at org.apache.xerces.readers.DefaultEntityHandler.startReadingFromDocument(DefaultEntityHandler.java:541)
at org.apache.xerces.framework.XMLParser.parseSomeSetup(XMLParser.java:312)
at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1080)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)
Nested exception: org.xml.sax.SAXParseException: The encoding "GBK" is not supported.
at org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1196)
at org.apache.xerces.readers.DefaultEntityHandler.startReadingFromDocument(DefaultEntityHandler.java:541)
at org.apache.xerces.framework.XMLParser.parseSomeSetup(XMLParser.java:312)
at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1080)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.dom4j.io.SAXReader.read(SAXReader.java:264)
at tt.UpdateXML.main(UpdateXML.java:16)

[bayougeng]

不支持gbk？那就utf-8咯。