XML学习——java解析xml文件

递归获取每个标签

package test;

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

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

public class test {

    public static void main(String[] args) {
        //1.获取dom4j解析对象
        SAXReader reader = new SAXReader();

        //2.获取要解析的xml文件
        try {
            Document document = reader.read(new File("./src/student.xml"));
            //3.获取根标签
            Element rootElement = document.getRootElement();

            getEachElement(rootElement);

        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static void getEachElement(Element element) {
        System.out.println(element.getName());
        List<Element> elements = element.elements();
        if (elements!=null) {
            for (Element element2 : elements) {
                getEachElement(element2);
            }
        }
    }

}

运行结果

获取标签属性

方法一：（foreach遍历）

 List<Element> elements = rootElement.elements();
               for (Element element :elements) {
                  String id = element.attributeValue("id");
                  String message = element.attributeValue("message");
                  System.out.println(id+"   "+message);
               }

方法二：(迭代器获取)

 List<Element> elements = rootElement.elements();
               for (Element element :elements) { 

                   Iterator attributeIterator = element.attributeIterator();
                   while (attributeIterator.hasNext()) {
                     Attribute attribute = (Attribute)attributeIterator.next();  

                     String name = attribute.getName();
                     String value = attribute.getValue();

                     System.out.println(name+"  "+value);

                 }

         }    

把XML写在本地文件

 Document docuement = reader.read(new File("./src/student.xml"));
             FileOutputStream fileOutputStream = new FileOutputStream("C:\\message.xml");

             OutputFormat outputFormat = OutputFormat.createPrettyPrint();
             XMLWriter xmlWriter = new XMLWriter(fileOutputStream,outputFormat);
             outputFormat.setEncoding("utf-8");
             xmlWriter.write(docuement);
             fileOutputStream.close();
             xmlWriter.close();