解析XML的两种方法
package cnslp.dom4j.com;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;/** * Created by cnslp on 2017/5/12 0012. * 解析XML文档的两种方法 */public class Demo { public static void main(String[] args) throws Exception { SAXReader reader = new SAXReader();//创建SAXReader读取器，专门用于读取xml File file = new File("books.xml"); Document document = reader.read(file); Element root = document.getRootElement(); //迭代方法 Iterator it = root.elementIterator(); while (it.hasNext()) { Element element = (Element) it.next(); Iterator attrIt = element.attributeIterator();//迭代元素属性 while (attrIt.hasNext()) { Attribute a = (Attribute) attrIt.next(); System.out.println(a.getValue()); } Iterator eleIt = element.elementIterator();//迭代子元素 while (eleIt.hasNext()) { Element e = (Element) eleIt.next(); System.out.println(e.getName() + ": " + e.getText()); } System.out.println(); } } /* //List方法 //根据saxReader的read重写方法可知，既可以通过inputStream输入流来读取，也可以通过file对象来读取 //Document document = saxReader.read(inputStream); List childElements = root.elements(); for (Element child : childElements) { System.out.println("element name:"+ child.getName()); //未知属性名情况下 List attributeList = child.attributes();//获取元素的所有属性 for (Attribute attr : attributeList) { System.out.println("name:"+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 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")); System.out.println(); } }*/} 2.生成XML文档
package cnslp.dom4j.com;import org.dom4j.*;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;import java.io.File;import java.io.FileOutputStream;/** * Created by cnslp on 2017/5/12 0012. */public class OutXML { 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); }}