“用dom4j解析包”对xml进行dom方式的CRUD操作

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package edu.dom4j.dom;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

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 XMLCRUD {

private String xmlfile = "WebRoot/product2.xml";

//取得product2.xml文档的document对象

public Document getDocument() throws DocumentException{

SAXReader reader = new SAXReader();

Document document = reader.read(xmlfile);

return document;

}

//将内存中的document对象写入xml文件中

public Document write2Xml(Document document) throws IOException{

OutputFormat format = OutputFormat.createPrettyPrint();

format.setEncoding("utf-8");

XMLWriter writer = new XMLWriter(new FileOutputStream(xmlfile), format);

writer.write(document);

writer.close();

return document;

}

//在第一个<product>下增加新标签<stock>(加在最后面)

@Test

public void addNewTag() throws DocumentException, IOException{

Document document = getDocument();

Element root = document.getRootElement();

//取得第一个product节点

Element product1 = root.element("product");

//向product1节点中添加一个新节点<stock>

Element stock = product1.addElement("stock")

.addAttribute("description", "库存");

stock.setText("200");

write2Xml(document);

}

//在指定位置插入新标签:在<notes>这是扳手</notes> 前插入<salenum>

@Test

public void insertNewTag() throws DocumentException, IOException{

Document document = getDocument();

//这里创建新节点不能用上面的方式创建新节点了,只能借助于DocumentHelper

Element salenum = DocumentHelper.createElement("salenum");

salenum.addAttribute("description","销量").setText("100");

//取得第一个product节点

Element product1 =document.getRootElement().element("product");

//得到product节点的子节点集合

List<Element> sonList = product1.elements();

sonList.add(2,salenum);

write2Xml(document);

}

//删除指定节点：删除上面插入的<salenum>节点

@Test

public void removeTag() throws DocumentException, IOException{

Document document = getDocument();

Element product1 = document.getRootElement().element("product");

Element salenum = product1.element("salenum");

product1.remove(salenum);

write2Xml(document);

}

//更改<stock description="库存">200</stock> 的属性和Text

@Test

public void updateTag() throws DocumentException, IOException{

Document document = getDocument();

Element product1 = (Element) document.getRootElement().elements("product").get(0);

Element stock = product1.element("stock");

//stock.setAttributeValue("description","库存量");//此方法过时

stock.attribute("description").setValue("库存量");

stock.setText("200件");

write2Xml(document);

}

}

product2.xml文件:

<?xml version="1.0" encoding="utf-8"?>

<catalog id="cata1">

<product category="HandTool" inventory="InStock">

<specifications weight="2.0kg">扳手</specifications>

<price street="香港街">80.0</price>

<notes>这是扳手</notes>

</product>

<product category="Table">

<specifications>桌椅</specifications>

<price street="澳门街" wholesale="部分">100.0</price>

</product>

</catalog>