java对xml文件的读写操作

下载demo4j包

将demo4j正确的引入项目中

hr.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hr SYSTEM "hr.dtd">
<hr><employee no="3309"><name>张三</name><age>31</age><salary>4000</salary><department><dname>会计部</dname><address>XX大厦-B103</address></department></employee><employee no="3310"><name>李四</name><age>23</age><salary>3000</salary><department><dname>工程部</dname><address>XX大厦-B104</address></department></employee>
</hr>

java文件

import java.io.FileNotFoundException;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.FileOutputStream;
import java.util.List;import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;public class Demo {public static void writeXml() throws Exception{String file = "D:\\eclipse\\eclipse-jee-juno-SR1-win32-x86_64\\workspace\\xml\\hr.xml";SAXReader reader = new SAXReader();Document document = reader.read(file);//获取XML文档的根节点，即hr标签Element root = document.getRootElement();Element employee = root.addElement("employee");employee.addAttribute("no", "3311");Element name = employee.addElement("name");name.setText("李铁柱");employee.addElement("age").setText("37");employee.addElement("salary").setText("3600");Element department = employee.addElement("department");department.addElement("dname").setText("人事部");department.addElement("address").setText("XX大厦-B105");Writer writer = new OutputStreamWriter(new FileOutputStream(file),"UTF-8");document.write(writer);writer.close();}public static void readXml() throws DocumentException{String file = "D:\\eclipse\\eclipse-jee-juno-SR1-win32-x86_64\\workspace\\xml\\hr.xml";SAXReader reader = new SAXReader();Document document = reader.read(file);//获取XML文档的根节点，即hr标签Element root = document.getRootElement();//elements方法用于获取指定的标签集合List<Element> employees =  root.elements("employee");for(Element employee : employees){//element方法用于获取唯一的子节点对象Element name = employee.element("name");String empName = name.getText();//getText()方法用于获取标签文本System.out.println(empName);System.out.println(employee.elementText("age"));System.out.println(employee.elementText("salary"));Element department = employee.element("department");System.out.println(department.element("dname").getText());System.out.println(department.element("address").getText());Attribute att = employee.attribute("no");System.out.println(att.getText());}}public static void main(String[] args) throws Exception {writeXml();readXml();}
}