如何使用dom4j如何读写xml文件

读取XML文件

主要代码：

SAXReader reader = new SAXReader(); Document document = reader.read(xmlFile);

要读取的xml文件内容

<?xml version="1.0" encoding="UTF-8"?> <person> <name>Tom</name> <age>11</age> </person>

实现具体代码：

import java.io.File; import java.util.Iterator; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.SAXReader; import org.junit.Test; public class ReadXML { @Test public void readXML(){ String path = ReadXML.class.getResource("/file/demo.xml").getPath(); File xmlFile = new File(path); //创建读取器 SAXReader reader = new SAXReader(); try { //从File中读取xml文档对象document Document document = reader.read(xmlFile); Element root = document.getRootElement(); String rootName = root.getName(); //获取根元素的子元素的迭代器 Iterator<Element> i = root.elementIterator(); System.out.println("根元素：<" + rootName + ">"); while(i.hasNext()){ Element e = i.next(); System.out.println("\t元素名：<" + e.getName() + ">,元素内容：" + e.getTextTrim()); } //----------------获取节点下的某个子节点--------------------- Element element = root.element("name"); System.out.println(element.getName() + ":" + element.getText()); } catch (DocumentException e) { e.printStackTrace(); } } }

运行结果

根元素：<person> 元素名：<name>,元素内容：Tom 元素名：<age>,元素内容：11 name:Tom

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操作Document和写入XML

主要代码：

Document document = DocumentHelper.createDocument(); XMLWriter writer = new XMLWriter(new FileOutputStream(file),format); writer.write(document);

具体实现代码：

import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.UnsupportedEncodingException; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; import org.junit.Test; public class WriteXML { @Test public void write(){ //创建一个Document对象 Document document = DocumentHelper.createDocument(); //添加根节点 Element root = document.addElement("root"); Element ele = root.addElement("element1"); //添加属性的名称和值 ele.addAttribute("style", "simple"); //添加节点内容 ele.addText("内容"); try { String path = WriteXML.class.getResource("/file").getPath(); File file = new File(path+"/out.xml"); //设置自动缩进的格式化类 OutputFormat format = OutputFormat.createPrettyPrint(); //写入输出流指定的文件中 XMLWriter writer = new XMLWriter(new FileOutputStream(file),format); writer.write(document); writer.close(); } catch (Exception e) { e.printStackTrace(); } } }

得到的xml文档

<?xml version="1.0" encoding="UTF-8"?> <root> <element1 style="simple">内容</element1> </root>