生成XML

来源：互联网发布：置信度传播算法编辑：程序博客网时间：2024/05/29 10:48

总共有三种方法生成xml

1. 第一种

//1.实例化DocumentBuilderFactory
           DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
           //2.通过dbf获取DocumentBuilder
           DocumentBuilder db=dbf.newDocumentBuilder();
           //3.创建Document
           Document document=db.newDocument();

           //4.创建标签<persons>
           Element elementPersons=document.createElement("persons");
           //创建<person>
           Element elementPerson=document.createElement("person");
           //创建<page>
           Element elementPage=document.createElement("page");
           //给标签设值
           elementPage.setTextContent("22");
           //创建<psex>
           Element elementPsex=document.createElement("psex");
           elementPsex.setTextContent("男");

           //5.创建属性
           Attr attrPid=document.createAttribute("pid");
           //给属性设值
           attrPid.setValue("1");
           Attr attrPname=document.createAttribute("pname");
           attrPname.setValue("hug");

           //6.建立关系
           document.appendChild(elementPersons);
           elementPersons.appendChild(elementPerson);
           elementPerson.appendChild(elementPage);
           elementPerson.appendChild(elementPsex);
           elementPerson.setAttributeNode(attrPid);
           elementPerson.setAttributeNode(attrPname);

           System.out.println("创建OK");


           //将生成的Document保存到XML文件中
           //1.实例化转换器工厂
           TransformerFactory tff=TransformerFactory.newInstance();
           //2.通过tff获取转换器
           Transformer transformer=tff.newTransformer();

           //来源
           DOMSource source=new DOMSource(document);
           //结果
           StreamResult streamResult=new StreamResult(new File("my.xml"));

           //3.开始转换
           transformer.transform(source, streamResult);

           System.out.println("保存成功");

2.第二种

/**
* 使用DOM4J创建XML
* @author Administrator
*
*/
public class TestCreateXMLByDom4j {
   public static void main(String[] args) {
       try {
           //1.创建Document
           Document document=DocumentHelper.createDocument();
           //2.创建标签<students>
           Element elementStudents=document.addElement("students");
           //创建标签<student>
           Element elementStudent=elementStudents.addElement("student");
           //设值属性
           elementStudent.addAttribute("sid", "1");
           elementStudent.addAttribute("sname", "hug");

           //创建标签<sage><ssex>
           Element elementSage=elementStudent.addElement("sage");
           //设值
           elementSage.setText("140");
           Element elementSsex=elementStudent.addElement("ssex");
           elementSsex.setText("男");

           //生成到XML中
           FileOutputStream fos=new FileOutputStream("students.xml");
           XMLWriter xmlWriter=new XMLWriter(fos,OutputFormat.createPrettyPrint());
           xmlWriter.write(document);
           xmlWriter.close();
           System.out.println("OK");

3.第三种（利用页面生成）

（1）（首先写一个实体类）eg：dog

（2）写servlet

@Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException {

       List<Dog> dogs=new ArrayList<Dog>();
       for (int i = 1; i <=3; i++) {
           dogs.add(new Dog(i, "旺旺"+i, 1));
       }
       req.setAttribute("dogs", dogs);
       req.getRequestDispatcher("success.jsp").forward(req, resp);

   }
}

（3）

在写一个页面，不过要改为xml模式

<?xml version="1.0" encoding="UTF-8"?><%@ page language="java" import="java.util.*" pageEncoding="UTF-8" contentType="text/xml; charset=UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<dogs>
   <c:forEach items="${dogs}" var="dog">
       <dog did="${dog.did}">
           <dname>${dog.dname}</dname>
           <dage>${dog.dage}</dage>
       </dog>
    </c:forEach>
</dogs>

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