dom4j操作xml

package com.zl;
import java.io.File;
import java.io.FileWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
 

public class TestDom4J {
	/**
	 * 得到Document
	 * @param file
	 * @return
	 * @throws Exception
	 */
	private Document getDocument(File file) throws Exception {
		SAXReader reader = new SAXReader();
		Document doc = reader.read(file);
		return doc;
	}
	/**
	 * 读取XML
	 * @param fileName
	 */
	private void readXml(String  fileName) {
		try {
			File file=new File(fileName);
			Document doc = getDocument(file);
			Element root = doc.getRootElement();
			for (Iterator it = root.elementIterator(); it.hasNext();) {
				Element el = (Element) it.next();
				String student=el.getName();
				String name=el.element("name").getText();
				String sex=el.elementText("sex");
				System.out.println(student+"-"+name+"-"+sex);
			}
		 

		} catch (Exception e) {
			e.printStackTrace();
		}

	}
	/**
	 * 建立一个新的XML
	 * @param fileName
	 * @throws Exception
	 */
	private void creatXML(String fileName) throws Exception {
		 Document doc=DocumentHelper.createDocument();
		 Element root=doc.addElement("persons");
		 Element st=root.addElement("student");
		 st.addAttribute("id", "1");
		 Element stn=st.addElement("name");
		 stn.setText("小明");
		 Element stg=st.addElement("sex");
		 stg.setText("女");
		 Element pel=root.addElement("person");
		 pel.addAttribute("id", "1");
		 Element name=pel.addElement("name");
		 name.setText("zl");
		 Element gender=pel.addElement("gender");
		 gender.setText("男");
		 Writer out=new FileWriter(fileName);
		 OutputFormat outf=OutputFormat.createPrettyPrint();
		 outf.setEncoding("GBK");
		 XMLWriter writer=new XMLWriter(out,outf);
		 writer.write(doc);
		 writer.close();
		 System.out.println("生成成功");

	}
	
	/**
	 * 添加XML中的一个元素
	 * @param file
	 * @throws Exception
	 */
	private void addElement(File file) throws Exception {
		 
		Document doc=getDocument(file);
		Element root=doc.getRootElement();
		Element man=root.addElement("man");
		man.addAttribute("id", "1");
		OutputFormat format=new OutputFormat();
		format.setEncoding("GBK");
		XMLWriter writer=new XMLWriter(new FileWriter(file),format);
		writer.write(doc);
		writer.close();
		System.out.println("OK");
		

	}
	
	private void delete(File	 file) throws Exception {
		 Document doc=getDocument(file);
		 Element root =doc.getRootElement();
		 List<Element> list=root.elements("student");
		 for (Element el: list) {
			if (el.attributeValue("id").equals("1")) {
				root.remove(el);	 
				XMLWriter writer=new XMLWriter(new FileWriter(file));
				writer.write(doc);
				writer.close();
				System.out.println("OK");
			}
		}
	}
	
	public static void main(String[] args) throws Exception {
		TestDom4J t=new TestDom4J();
		//t.modifyElment(new File("zl.xml"));
		t.creatXML("zl.xml");
		//t.readXml("struts.xml");
		//t.delete(new File("zl.xml"));
 
		 
	}
}