如何在jsp程序中用代码 生成一个xml文件

Question

package org.DesignAC.bean;
import javax.xml.parsers.*;
import java.io.*;
import org.w3c.dom.*;
import org.apache.crimson.tree.XmlDocument;
/**
 * function:生成XML文件
 */
public class xmlTest2 {
public static void main(String args[]){
try{
//获得一个xml解析器
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();

Document doc=builder.newDocument();
//创建
Element root=doc.createElement("catalog");
//将根元素填加上文档
doc.appendChild(root);
//建立book元素
Element book4=doc.createElement("CCC");
book4.setAttribute("id","book"+1);
root.appendChild(book4);
for(int i=0;i<1;i++){
Element book=doc.createElement("book");
book.setAttribute("id","book"+i+1);
root.appendChild(book);
//建立author,title元素
Element author=doc.createElement("author");
book.appendChild(author);
Text tAuthor=doc.createTextNode("飞碟");
author.appendChild(tAuthor);
Element title=doc.createElement("title");
book.appendChild(title);
Text tTitle=doc.createTextNode("飞碟众书");
title.appendChild(tTitle);
//创建publish_date 
Element publish_date=doc.createElement("publish_date");
book.appendChild(publish_date);
Element year=doc.createElement("year");
publish_date.appendChild(year);
Text tYear=doc.createTextNode("2003");
year.appendChild(tYear);
Element month=doc.createElement("month");
publish_date.appendChild(month);
Text tMonth=doc.createTextNode("05");
month.appendChild(tMonth);
Element day=doc.createElement("day");
publish_date.appendChild(day);
Text tDay=doc.createTextNode("29");
day.appendChild(tDay);
//创建描述
Element description=doc.createElement("description");
book.appendChild(description);
Text tDescription=doc.createTextNode("一本好书书书书");
description.appendChild(tDescription);
}
Element book2=doc.createElement("aaa");
book2.setAttribute("id","book"+1);
root.appendChild(book2);
Element book3=doc.createElement("bbb");
book3.setAttribute("id","book"+1);
root.appendChild(book3);
//写入XML文件
FileOutputStream output=new FileOutputStream("books2.xml");
System.out.println("aa");
OutputStreamWriter outWriter=new OutputStreamWriter(output);
((XmlDocument) doc).write(outWriter, "GB2312");
outWriter.close();
output.close();
}catch(Exception e){
System.out.println(e);
}
}}

Answer 1

用这个吧，把上面的//写入xml文件换成
//生成xml文件
DOMSource source = new DOMSource(doc); 
StreamResult result = new StreamResult(new File(TopicInfo.getXmlUrl())); 
TransformerFactory tfactory = TransformerFactory.newInstance(); 
Transformer transformer = tfactory.newTransformer(); 
transformer.setOutputProperty("encoding","UTF-8");
transformer.transform(source,result);