XML解析之使用DOM4j操作XML文档

最新推荐文章于 2022-01-12 19:17:12 发布

原创最新推荐文章于 2022-01-12 19:17:12 发布 · 592 阅读

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本文介绍了一个使用Dom4j库操作XML文件的Java示例程序，包括读取、添加和更新XML节点的方法。该程序展示了如何遍历XML结构、修改属性值以及将更改保存回文件。

package forXML;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
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;

public class Dom4jParser {
	/**
	 * 最后一发实验报告~~~~啦啦啦~~祝高分通过~~~
	 * 
	 * @author catfish
	 */
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		// 获取解析器
		SAXReader saxReader = new SAXReader();
		Document doc = saxReader.read(new File("src/forXML/employee.xml"));

		travel(doc.getRootElement());
		System.out.println("-----我是最可爱的分界线----");
		add(doc);
		update(doc);
		travel(doc.getRootElement());
	}
	
	//更新xml文件
	public static void update(Document doc) throws Exception {
		// TODO Auto-generated method stub
		Iterator iter = doc.getRootElement().elementIterator("employee");

		while (iter.hasNext()) {
			Element employee = (Element) iter.next();
			Element emp_name = (Element) employee.elements("name").get(0);
			if (emp_name.getTextTrim().equals("孙二狗")) {
				Element emp_pay = employee.element("monthly_pay");
				emp_pay.addAttribute("mode", "credit_card");
				emp_pay.setText("2300");
			}
		}

		// OutputFormat.createCompactFormat() 紧凑格式
		OutputFormat format = OutputFormat.createPrettyPrint();
		format.setEncoding("UTF-8");

		XMLWriter writer = new XMLWriter(new FileOutputStream(new File("src/dom4j/class.xml")), format);
		writer.write(doc);
		writer.close();
	}

	//添加一个节点
	public static void add(Document doc) throws Exception {
		// TODO Auto-generated method stub
		Element newPlo = DocumentHelper.createElement("employee");
		newPlo.addAttribute("sn", "E-30000232323022");

		Element newPlo_name = DocumentHelper.createElement("name");
		newPlo_name.setText("宋猪头");
		newPlo.add(newPlo_name);

		Element newPlo_age = DocumentHelper.createElement("age");
		newPlo_age.setText("26");
		newPlo.add(newPlo_age);

		Element newPlo_pay = DocumentHelper.createElement("monthly_pay");
		newPlo_pay.addAttribute("mode", "cash");
		newPlo_pay.setText("1900");
		newPlo.add(newPlo_pay);

		doc.getRootElement().add(newPlo);

		OutputFormat format = OutputFormat.createPrettyPrint();
		format.setEncoding("UTF-8");
		XMLWriter writer = new XMLWriter(new FileOutputStream(new File("src/forXML/employee.xml")), format);
		writer.write(doc);
		writer.close();
	}
	
	//遍历xml文件
	public static void travel(Element element) {
		// TODO Auto-generated method stub
		System.out.println(element.getName() + ": " + element.getTextTrim());
		List list = element.attributes();
		for (int i = 0; i < list.size(); i++) {
			Attribute attri = (Attribute) list.get(i);
			System.out.println(attri.getName() + ": " + attri.getText());
		}
		Iterator iterator = element.elementIterator();
		while (iterator.hasNext()) {
			Element el = (Element) iterator.next();
			travel(el);
		}
	}

}

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