dom4j解析XML的CURD操作

package cn.test.java.dom4j;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test;

public class XMLcurd {
    //创建document对象
    private Document getDocument() throws DocumentException {
        SAXReader saxReader = new SAXReader();
        Document document = saxReader.read(new File("src/cn/test/java/dom4j/test.xml"));
        return document;
    }
    //将document写入到指定的XML
    private void writerToXML(Document document)
    throws UnsupportedEncodingException, FileNotFoundException,
    IOException {
    //方法一：写入xml文件中包含有中文时
    //设置输出格式
    OutputFormat outputFormat = OutputFormat.createPrettyPrint();
    //设置输出编码方式
    outputFormat.setEncoding("UTF-8");
    //将内存中的字节流转换为字符流
    Writer writer = new OutputStreamWriter(new FileOutputStream("src/cn/test/java/dom4j/test.xml"),"UTF-8");
    //构造XMLWriter用于写入XML文件
    XMLWriter xmlWriter = new XMLWriter(writer,outputFormat);
    xmlWriter.write(document);
    xmlWriter.close();
}
    
    //XML的增加操作
    @Test
    public void Create() throws Exception{
        Document document = this.getDocument();
        Element rootElement = document.getRootElement();
        Element firstElement = (Element) rootElement.elements().get(0);
        firstElement.addElement("单价").setText("15");//在内存中(字节存储)
        writerToXML(document);
    }
    //XML的修改操作
    @Test
    public void upDate() throws Exception{
        Document document = this.getDocument();
        Element rootElement = document.getRootElement();
        Element secondElement = (Element) rootElement.elements().get(1);
        secondElement.element("产地").setText("深圳");    
        writerToXML(document);
        
    }
    //XML的删除操作
    @Test
    public void delete() throws Exception{
        Document document = this.getDocument();
        Element rootElement = document.getRootElement();
        List<Element> elementList = rootElement.elements();
        for(Element e:elementList){
            Element bandElement = e.element("车牌");
            e.remove(bandElement);
        }
        writerToXML(document);
    }
}