创建xml文档并输出到文件
import java.io.File;
import java.io.FileOutputStream;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
public class Demo {
public static void main(String[] args) throws Exception {
Document doc = DocumentHelper.createDocument();
//增加根节点
Element books = doc.addElement("books");
//增加子元素
Element book1 = books.addElement("book");
Element title1 = book1.addElement("title");
Element author1 = book1.addElement("author");
Element book2 = books.addElement("book");
Element title2 = book2.addElement("title");
Element author2 = book2.addElement("author");
//为子节点添加属性
book1.addAttribute("id", "001");
//为元素添加内容
title1.setText("Harry Potter");
author1.setText("J K. Rowling");
book2.addAttribute("id", "002");
title2.setText("Learning XML");
author2.setText("Erik T. Ray");
//实例化输出格式对象
OutputFormat format = OutputFormat.createPrettyPrint();
//设置输出编码
format.setEncoding("UTF-8");
//创建需要写入的File对象
File file = new File("D:" + File.separator + "books.xml");
//生成XMLWriter对象，构造函数中的参数为需要输出的文件流和格式
XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
//开始写入，write方法中包含上面创建的Document对象
writer.write(doc);
}
}
运行后会在D盘下生成一个books.xml
使用Iterator迭代器的方式来解析xml
xml文档如下：
<?xml version="1.0" encoding="UTF-8"?> <books> <book id="001"> <title>Harry Potter</title> <author>J K. Rowling</author> </book> <book id="002"> <title>Learning XML</title> <author>Erik T. Ray</author> </book> </books>
import java.io.File; import java.util.Iterator; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class Demo { public static void main(String[] args) throws Exception { SAXReader reader = new SAXReader(); Document document = reader.read(new File("books.xml")); Element root = document.getRootElement(); Iterator it = root.elementIterator(); while (it.hasNext()) { Element element = (Element) it.next(); //未知属性名称情况下 /*Iterator attrIt = element.attributeIterator(); while (attrIt.hasNext()) { Attribute a = (Attribute) attrIt.next(); System.out.println(a.getValue()); }*/ //已知属性名称情况下 System.out.println("id: " + element.attributeValue("id")); //未知元素名情况下 /*Iterator eleIt = element.elementIterator(); while (eleIt.hasNext()) { Element e = (Element) eleIt.next(); System.out.println(e.getName() + ": " + e.getText()); } System.out.println();*/ //已知元素名情况下 System.out.println("title: " + element.elementText("title")); System.out.println("author: " + element.elementText("author")); System.out.println(); } } }
运行结果：
用List列表的方式来解析xml
import java.io.File; import java.util.List; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.Element; import org.dom4j.io.SAXReader; public class Demo { public static void main(String[] args) throws Exception { SAXReader reader = new SAXReader(); File file = new File("books.xml"); Document document = reader.read(file); Element root = document.getRootElement(); List<Element> childElements = root.elements(); for (Element child : childElements) { //未知属性名情况下 /*List<Attribute> attributeList = child.attributes(); for (Attribute attr : attributeList) { System.out.println(attr.getName() + ": " + attr.getValue()); }*/ //已知属性名情况下 System.out.println("id: " + child.attributeValue("id")); //未知子元素名情况下 /*List<Element> elementList = child.elements(); for (Element ele : elementList) { System.out.println(ele.getName() + ": " + ele.getText()); } System.out.println();*/ //已知子元素名的情况下 System.out.println("title" + child.elementText("title")); System.out.println("author" + child.elementText("author")); //这行是为了格式化美观而存在 System.out.println(); } } }
