操作xml文件问题
能不能像操作数据库那样读写xml文件？

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看看api里javax.xml这部分
要用到DocumentBuilderFactory，DocumentBuilder这些
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JDK 1.5 中还增加了 XPath，用于查询数据很方便的。
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jdomAPI
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可以用apche的类库，我前两天正好在公司写了个操作xml文件的类，给你看下:
..............

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.xml.sax.InputSource;

...........

DomainModel domainModel = (DomainModel) request.getSession().getAttribute("TABLE");
InputSource is = new InputSource("d:\\huaxia\\huaxiaweb\\src\\main\\resources\\myapp.struts.xml");
is.setEncoding("UTF-8");
SAXBuilder sb = new SAXBuilder();
Document structsXML;
try {
structsXML = sb.build(is);
} catch (JDOMException e1) {
// TODO Auto-generated catch block
logger.info(e1.getMessage());
return;
} catch (IOException e1) {
// TODO Auto-generated catch block
logger.info(e1.getMessage());
return;
}

// StructsXML文件的根元素
Element root = structsXML.getRootElement();

Element actionMapping = root.getChild("action-mappings");

boolean haveMainAction = false;
boolean haveUpdateAction = false;
boolean haveCreateAction = false;
java.util.List<Element> elements = actionMapping.getChildren();
for(Element el: elements){
if( el.getAttributeValue("path").equals( ("/" + domainModel.getTableNameInJava() + "MainAction"))
&& el.getAttributeValue("parameter").equals("method")
&& el.getAttributeValue("name").equals((domainModel.getTableNameInJavaFirstLow() + "Form"))){
logger.info(domainModel.getTableNameInJava() +"MainAction has already existed.");
haveMainAction = true;
}
if( el.getAttributeValue("path").equals( ("/" + domainModel.getTableNameInJava() + "CreateAction"))
&& el.getAttributeValue("input").equals( ("/" + domainModel.getTableNameInJava() + "Create.jsp"))){
logger.info(domainModel.getTableNameInJava() + "CreateAction has already existed.");
haveCreateAction = true;
}
if( el.getAttributeValue("path").equals( ("/" + domainModel.getTableNameInJava() + "UpdateAction"))
&& el.getAttributeValue("input").equals( ("/" + domainModel.getTableNameInJava() + "Update.jsp"))){
logger.info(domainModel.getTableNameInJava() + "UpdateAction has already existed.");
haveUpdateAction = true;
}
}


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我解释下：
 InputSource is = new InputSource("d:\\huaxia\\huaxiaweb\\src\\main\\resources\\myapp.struts.xml"); 
把一个xml文件读入InputSource类 这个类是jdom的一个部分。
is.setEncoding("UTF-8"); 
SAXBuilder sb = new SAXBuilder(); 
Document structsXML;