Java 创建xml文件和操作xml数据

java中的代码

import java.io.File;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class CreateXML {

    public static void main(String[] args) {

        try {
            //创建xml文件。DOM方式
            DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
            DocumentBuilder builder=factory.newDocumentBuilder();
            Document document=builder.newDocument();
            //添加根元素,指定标签
            Element root=document.createElement("books");
            //给根元素添加属性值
            root.setAttribute("id", "aaa");

            //创建一个子标签
            Element book1=document.createElement("book");
            book1.setAttribute("id", "1");
            //再创建下一级的子标签
            Element name1=document.createElement("name");
            Element price1=document.createElement("price");
            //设定标签内的内容
            name1.setTextContent("小说");
            price1.setTextContent("100元");
            //把子标签添加到上一级标签,appendChild方法
            book1.appendChild(name1);
            book1.appendChild(price1);

            //复制以上代码，把节点填充完
            Element book2=document.createElement("book");
            book2.setAttribute("id", "2");
            Element name2=document.createElement("name");
            Element price2=document.createElement("price");
            name2.setTextContent("杂志");
            price2.setTextContent("200元");
            book2.appendChild(name2);
            book2.appendChild(price2);

            Element book3=document.createElement("book");
            book3.setAttribute("id", "3");
            Element name3=document.createElement("name3");
            Element price3=document.createElement("price3");
            name3.setTextContent("课本");
            price3.setTextContent("300元");
            book3.appendChild(name3);
            book3.appendChild(price3);

            root.appendChild(book1);
            root.appendChild(book2);
            root.appendChild(book3);
            document.appendChild(root);//最后一步
            //文档内容创建完毕，下面是输出文档
            TransformerFactory transformerFactory =TransformerFactory.newInstance();
            Transformer transformer1=transformerFactory.newTransformer();
            StringWriter writer=new  StringWriter();
            transformer1.transform(new DOMSource(document), new StreamResult(writer));
            System.out.println(writer.toString());//成功输出，可以复制
            //直接生成xml文件
            transformer1.transform(new DOMSource(document), new StreamResult(new File("newxml.xml")));

        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (TransformerConfigurationException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        } catch (TransformerException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }

        }

}

生成的xml文件代码

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<books id="aaa">
<book id="1">
<name>小说</name>
<price>100元</price>
</book>
<book id="2">
<name>杂志</name>
<price>200元</price>
</book>
<book id="3">
<name3>课本</name3>
<price3>300元</price3>
</book>
</books>