DOM4J 解析XML

使用DOM4J构建XML:

package com.rui.dom4j;

import java.io.FileOutputStream;
import java.io.FileWriter;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Test1 {
	
	public static void main(String[] args) throws Exception {
		/*
		// 创建文档的根节点
		Document document = DocumentHelper.createDocument();
		// 创建元素
		Element root = DocumentHelper.createElement("student");
		// 设置根元素节点
		document.setRootElement(root);
		*/
		
		Element root = DocumentHelper.createElement("student");
		
		Document document = DocumentHelper.createDocument(root);
		
		root.addAttribute("name", "zhangsan");
		
		Element helloElement = root.addElement("hello");
		Element worldElement = root.addElement("world");
		
		helloElement.setText("hello");
		worldElement.setText("world");
		
		helloElement.addAttribute("age", "20");
		worldElement.addAttribute("age", "21");
		
		// 输出到 控制台
		XMLWriter xmlWriter = new XMLWriter();//(System.out);
		
		xmlWriter.write(document);
		
		OutputFormat format = new OutputFormat("    ",true,"UTF-8");
		
		// 使用字节流
		XMLWriter xmlWriter2 = new XMLWriter(new FileOutputStream("student2.xml"),format);
		
		xmlWriter2.write(document);
		
		// 使用字符流
		XMLWriter xmlWriter3 = new XMLWriter(new FileWriter("student3.xml"),format);
		
		xmlWriter3.write(document);
		// 注意字符流方式要使用 flush()方法清空缓冲区 和 使用 close() 方法去关闭字符流
		xmlWriter3.flush();
		xmlWriter3.close();
		
		Runtime.getRuntime().exit(0);
	}

}

使用DOM4J解析XML:

package com.rui.dom4j;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.DOMReader;
import org.dom4j.io.SAXReader;

public class Test2 {

	public static void main(String[] args) throws Exception {
		SAXReader saxReader = new SAXReader();
		
		Document doc = saxReader.read(new File("student2.xml"));
		
		Element root = doc.getRootElement();
		
		System.out.println("root element: " + root.getName()); 
		
		List childList = root.elements();
		
		System.out.println(childList.size());
		
		List childList2 = root.elements("hello");
		
		System.out.println(childList2.size());
		
		Element first = root.element("world");
		
		System.out.println(first.getName());
		System.out.println(first.attributeValue("age"));
		
		
		
		for(Iterator iter = root.elementIterator(); iter.hasNext();){
			Element e = (Element)iter.next();
			
			System.out.println(e.attributeValue("age"));
		}
		
		System.out.println("----------------------------------");
		
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		
		DocumentBuilder db = dbf.newDocumentBuilder();
		
		org.w3c.dom.Document document = db.parse(new File("student2.xml"));
		
		DOMReader domReader = new DOMReader();
		
		// 将 JAXP 的 Document 转换为 dom4j的Document
		Document d = domReader.read(document);
		
		Element rootElement = d.getRootElement();
		
		System.out.println(rootElement.getName());
		
		
		
		
		
		
		System.exit(0);
	}

}

使Dom4j在断网情况下不下载DTD文件进行XML校验,设置dom4j属性如下:

import com.sun.org.apache.xerces.internal.impl.Constants;
SAXReader saxReader = new SAXReader();

			saxReader.setValidation(false);
			// saxReader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
			saxReader.setFeature(Constants.XERCES_FEATURE_PREFIX + Constants.LOAD_EXTERNAL_DTD_FEATURE, false);

			Document mybatisConfig = saxReader.read(SpringContextHolder.class.getClassLoader().getResourceAsStream("mapper/Configuration.xml"));

项目如附件: