XML生成

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XML也可以通过Java代码生成，一共有三种

1.Java原生态的，2.dom4j(一种导入jar包方式),3.将对象集合直接用c标签展示到xml文件上。

1.java原生态

代码如下：

package com.zking.test;

import java.io.File;

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

/**
* 创建XML 使用Document
* @author Administrator
*
*/
public class TestCreateXMlByDocument {
   public static void main(String[] args) {
       try {
           //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");
       } catch (ParserConfigurationException e) {
           e.printStackTrace();
       } catch (TransformerConfigurationException e) {
           e.printStackTrace();
       } catch (TransformerException e) {
           e.printStackTrace();
       }
   }
}

2.dom4j代码如下：

package com.zking.test;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

/**
* 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");
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       } catch (UnsupportedEncodingException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }

   }
}

第三种单独讲解，有很多需要注意的地方。。。。。

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