xml解析

1.jdom解析
SAXBuilder.build("xxx.xml") 解析XML文档

Document.getRootElement() 获取根元素

Element.getChildren() 获取根元素下的子元素，返回List

Element.getAttributeValue(String) 获取指定元素的信息

Element.getChildText 获取指定元素的内容

Element.setAttribute 为元素添加信息

Element.addContent(String,String) 为元素添加子元素内容，也可以直接添加另一个元素节点

Document.setRootElement(Element) 为文档添加根元素

XMLOutputter.output(Document,FileWriter) 将Docuemnt写入到FileWriter文件流中

package com.success;

import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
import org.junit.Test;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.util.List;

/**
 * @author zhz
 * @describe 解析xml文件
 * @date 2019/8/20 20:31
 */
public class XmlParse {

    @Test
    public void test1() {
        SAXBuilder saxBuilder = new SAXBuilder();
        Document document = null;

        URL resource = XmlParse.class.getClassLoader().getResource("zz.xml");


        try {
            document = saxBuilder.build(resource);
            Element rootElement = document.getRootElement();
            List<Element> list = rootElement.getChildren("person");
            for (Element element : list) {
                System.out.println(element.getAttributeValue("id"));
                if (element.getAttributeValue("id").equals("2")) {

                    Element user = element.getChild("username");
                    Element password = element.getChild("password");
                    user.setText("wangwu");
                    password.setText("123456");
                }
            }

            XMLOutputter outputter = new XMLOutputter();
            outputter.output(document, new FileWriter("zz.xml"));


        } catch (JDOMException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}