三十八毒

用JDOM对XML文档的读写增删改转换等操作，是我自己的练习题，没有整理和注释，只做以后查看之用。主要方法同DOM4J对XML文档的读写增删改转换等文章，涉及到的XML、XSLT等文档不再写入。

package xml.jdom.wkjava;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamSource;

import org.jdom.Attribute;
import org.jdom.CDATA;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.Text;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.jdom.transform.JDOMResult;
import org.jdom.transform.JDOMSource;
import org.jdom.xpath.XPath;

public class Test {
	Document doc = null;

	public Test() throws IOException, TransformerException, JDOMException {
		Document doc = load("product.xml");
		doc.getRootElement().addContent(new Element("test").addContent(new Text("中文")));
		printDoc(doc);
		
		printDoc(trans(doc,"product2cn.xslt"));
		
		doc = createDoc();
		
		printDoc(doc);
		updatePrice(doc);
		printDoc(doc);
		
		storeDoc(doc, "new.xml");
	}

	public static void main(String[] args) {
		try {
			new Test();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (TransformerException e) {
			e.printStackTrace();
		} catch (JDOMException e) {
			e.printStackTrace();
		}
	}
	
	public Document load(String xmlfile) 
	    throws FileNotFoundException, JDOMException, IOException{
		
		SAXBuilder builder = new SAXBuilder();
		Document doc = builder.build(new FileInputStream(xmlfile));
		return doc;
    }

	public void printDoc(Document doc) throws IOException{
		XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
		Writer out = new OutputStreamWriter(System.out);
		outputter.output(doc,out);
		out.flush();
	}

	public Document createDoc(){
		Document doc = new Document();
		Element root = new Element("product");
		doc.addContent(root);
		
		root.setAttribute(new Attribute("id","p10"))
		    .addContent(new Element("name").addContent(new CDATA("<test>by weiking</test>")))
		    .addContent(new Element("price").addContent(new Text("200.00"))).setAttribute("单位","人民币");
		    
		return doc;
	}

	public void updatePrice(Document doc) throws JDOMException{
		XPath path = XPath.newInstance("//price");
		Element e = (Element)path.selectSingleNode(doc);
		e.setText("300.00");
	}
	
	public void storeDoc(Document doc,String filename) throws IOException{
		XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
		OutputStream out = new FileOutputStream(filename);
		outputter.output(doc,out);
		out.close();
	}
	
	public Document trans(Document doc,String xslt) 
	    throws TransformerException, FileNotFoundException{
		
		TransformerFactory factory = TransformerFactory.newInstance();
		Transformer transformer = factory.newTransformer(
				new StreamSource(new FileInputStream(xslt)));
		
		JDOMSource source = new JDOMSource(doc);
		JDOMResult result = new JDOMResult();
		
		transformer.transform(source,result);
		
		return result.getDocument();
	}
}