怎么利用一个dom对象生成一个xml文件

一个XML文档，可以先构造一个DOM，然后将DOM转化为xml序列，输出或者生成文件。package test

import java.io.ByteArrayOutputStream

import java.io.File

import java.io.FileOutputStream

import javax.xml.parsers.DocumentBuilder

import javax.xml.parsers.DocumentBuilderFactory

import javax.xml.transform.Transformer

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 Test {

public static void generate(){

try {

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance()

DocumentBuilder builder = factory.newDocumentBuilder()

Document document = builder.newDocument()

document.setXmlVersion("1.0")

document.setXmlStandalone(true)

Element root = document.createElement_x("MobileNet") //创建根节点

document.appendChild(root) //将根节点添加到Document对象中

Element pageElement = document.createElement_x("page")//设置第一个page元素到

pageElement.setAttribute("name", "list.jsp")//设置page节点的name属性

Element methodElement = document.createElement_x("method") //设置method节点

methodElement.setTextContent("get") //给method设置值

pageElement.appendChild(methodElement)//添加method节点到page节点内

Element displayElement = document.createElement_x("display") //设置method节点

displayElement.setTextContent("list撒旦发放")//给display设置值

pageElement.appendChild(displayElement) //添加display节点到page节点内

Element request_paramElement = document.createElement_x("request_param")

request_paramElement.setTextContent("request_param1|request_param2")

pageElement.appendChild(request_paramElement)

root.appendChild(pageElement)

pageElement = document.createElement_x("page") //设置第二个page元素到

pageElement.setAttribute("name", "content.jsp")//设置page节点的name属性

methodElement = document.createElement_x("method")

methodElement.setTextContent("post")

pageElement.appendChild(methodElement)

displayElement = document.createElement_x("display")

displayElement.setTextContent("content")

pageElement.appendChild(displayElement)

Element url_titleElement = document.createElement_x("url_title") //设置url_title节点

url_titleElement.setTextContent("title,publisher,published_calendar")//给url_title设置值

pageElement.appendChild(url_titleElement)//添加url_title节点到page节点内

root.appendChild(pageElement)//将page段加人根节点内

TransformerFactory transFactory = TransformerFactory.newInstance()//开始把Document映射到文件

Transformer transFormer = transFactory.newTransformer()

DOMSource domSource = new DOMSource(document) //设置输出结果

File file = new File("MobileNetRule.xml")//生成xml文件

if (!file.exists()) {

file.createNewFile()

}

FileOutputStream out = new FileOutputStream(file) //文件输出流

StreamResult xmlResult = new StreamResult(out) //设置输入源

transFormer.transform(domSource, xmlResult) //输出xml文件

System.out.println(file.getAbsolutePath()) //测试文件输出的路径

TransformerFactory tf = TransformerFactory.newInstance()

Transformer t = tf.newTransformer()

t.setOutputProperty("{/encoding/}","GB2312/")

ByteArrayOutputStream boc = new ByteArrayOutputStream()

t.transform(new DOMSource(document), new StreamResult(boc))

String xmlstring = boc.toString()

System.out.println(xmlstring)

} catch (Exception e) {

e.printStackTrace()

}

}

public static void main(String[] args){

Test.generate()

}

}

包括增加，删除，查询，主方法测式方法，下面有xml文档，记得导入jdom.jar

步骤是：

1、建立DocumentBuilderFactory

2、建立DocumentBuilder

3、解析xml文档

4、 *** 作xml文档

5、建立TransformerFactory

6、建立Transformer

7、保存修改后的xml文档

下边是一个例子，希望可以帮到你

import java.io.File

import java.io.IOException

import java.util.HashMap

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.TransformerFactoryConfigurationError

import javax.xml.transform.dom.DOMSource

import javax.xml.transform.stream.StreamResult

import org.w3c.dom.Attr

import org.w3c.dom.DOMException

import org.w3c.dom.Document

import org.w3c.dom.Element

import org.w3c.dom.NodeList

import org.xml.sax.SAXException

public class Company {

String fileXMLName

public Company(String fileXMLName) {

super()

this.fileXMLName = fileXMLName

}

public void showList(){

try {

DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance()

DocumentBuilder db=dbf.newDocumentBuilder()

Document doc=db.parse(this.fileXMLName)

NodeList n1=doc.getElementsByTagName("雇员")

for(int i=0i<n1.getLength()i++){

Element guyuan=(Element)n1.item(i)

Attr bumen=guyuan.getAttributeNode("部门")

Attr quanzhi=guyuan.getAttributeNode("全职")

System.out.print("雇员"+(i+1))

if(bumen!=null){

System.out.println("部门："+bumen.getValue())

}

if(quanzhi!=null){

System.out.println("全职："+quanzhi.getValue())

}

NodeList xingming=guyuan.getElementsByTagName("姓名")

System.out.println("姓名："+xingming.item(0).getFirstChild().getNodeValue())

NodeList gudate=guyuan.getElementsByTagName("雇佣日期")

System.out.println("雇佣日期："+gudate.item(0).getFirstChild().getNodeValue())

NodeList qingdan=guyuan.getElementsByTagName("项目清单")

NodeList xiangmu=((Element)qingdan.item(0)).getElementsByTagName("项目")

for(int j=0j<xiangmu.getLength()j++){

Element xiangmu2=(Element)xiangmu.item(j)

NodeList chanping=xiangmu2.getElementsByTagName("产品")

NodeList jiage=xiangmu2.getElementsByTagName("价格")

System.out.println("项目"+(j+1)+"产品："+chanping.item(0).getFirstChild().getNodeValue())

System.out.println("项目"+(j+1)+"产品："+jiage.item(0).getFirstChild().getNodeValue())

}

}

} catch (DOMException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (ParserConfigurationException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (SAXException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

public void CreateOne(String chanping,String jiage){

try {

DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance()

DocumentBuilder db=dbf.newDocumentBuilder()

Document doc=db.parse(this.fileXMLName)

NodeList xingming=doc.getElementsByTagName("姓名")

Element xingming1=null

for(int i=0i<xingming.getLength()i++){

xingming1=(Element)xingming.item(i)

String name=xingming1.getFirstChild().getNodeValue()

if(name.equals("王权")){

Element guyuan=(Element)xingming1.getParentNode()

NodeList qingdan=guyuan.getElementsByTagName("项目清单")

Element qingdan1=(Element)qingdan.item(0)

Element xiangmu=doc.createElement("项目")

Element chan=doc.createElement("产品")

Element jia=doc.createElement("价格")

chan.appendChild(doc.createTextNode(chanping))

jia.appendChild(doc.createTextNode(jiage))

xiangmu.appendChild(chan)

xiangmu.appendChild(jia)

qingdan1.appendChild(xiangmu)

TransformerFactory tf=TransformerFactory.newInstance()

Transformer tr=tf.newTransformer()

tr.transform(new DOMSource(doc), new StreamResult(new File("newcompany.xml")))

break

}

}

} catch (DOMException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (TransformerConfigurationException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (ParserConfigurationException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (SAXException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (TransformerFactoryConfigurationError e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (TransformerException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

public void deleteone(String bumen){

try {

DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance()

DocumentBuilder db=dbf.newDocumentBuilder()

Document doc=db.parse(this.fileXMLName)

NodeList gongsis=doc.getElementsByTagName("公司")

Element gongsi=(Element)gongsis.item(0)

NodeList guyuans=doc.getElementsByTagName("雇员")

Element guyuan=null

for(int i=0i<guyuans.getLength()i++){

guyuan=(Element)guyuans.item(i)

Attr bumens=guyuan.getAttributeNode("部门")

if((bumens!=null)&&(bumens.getValue().equals(bumen))){

gongsi.removeChild(guyuan)

}

}

TransformerFactory tf=TransformerFactory.newInstance()

Transformer tr=tf.newTransformer()

tr.transform(new DOMSource(doc), new StreamResult(new File("newcompany.xml")))

} catch (DOMException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (TransformerConfigurationException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (ParserConfigurationException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (SAXException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (TransformerFactoryConfigurationError e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (TransformerException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Company com=new Company("newcompany.xml")

com.showList()

// com.CreateOne("液晶显示器", "200")

// Company com1=new Company("newcompany.xml")

// com1.showList()

com.deleteone("客服部")

Company com2=new Company("newcompany.xml")

com2.showList()

}

}

xml文档格式

<?xml version="1.0" encoding="UTF-8"?><!--内部定义--><公司>

<雇员 全职="是" 部门="市场部">

<姓名>李东</姓名>

<雇佣日期>2005-01-15</雇佣日期>

<项目清单 数量="2">

<项目>

<产品>打印机</产品>

<价格>$111.00</价格>

</项目>

<项目>

<产品>笔记本</产品>

<价格>$9897.00</价格>

</项目>

</项目清单>

</雇员>

</公司>

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