java写入xml代码 java写入xml文件

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如何用Java实现对xml文件的读取和写入以及保存

直接附源码import java.io.FileWriter;

import java.io.IOException;

import java.util.Iterator;import org.dom4j.*;

import org.dom4j.io.XMLWriter;

public class Dom4jSample { public static void main(String[] args) {

Dom4jSample dom4jSample = new Dom4jSample();

Document document = dom4jSample.createDocument();

try{

dom4jSample.FileWrite(document);

Document documentStr = dom4jSample.StringToXML("ChinaI Love!/China");

dom4jSample.XMLWrite(documentStr);

Element legend = dom4jSample.FindElement(document);

System.out.println(legend.getText());

}

catch(Exception e)

{

}

* Create a XML Document

public Document createDocument()

{

Document document = DocumentHelper.createDocument();

Element root = document.addElement("root");

Element author1 = root.addElement("Lynch");

author1.addAttribute("Age","25");

author1.addAttribute("Country","China");

author1.addText("I am great!");

Element author2 = root.addElement("Legend");

author2.addAttribute("Age","25");

author2.addAttribute("Country","China");

author2.addText("I am great!too!");

return document;

}

* Create a XML document through String

public Document StringToXML(String str) throws DocumentException

{

Document document = DocumentHelper.parseText(str);

return document;

}

public Element FindElement(Document document)

{

Element root = document.getRootElement();

Element legend = null;

for(Iterator i=root.elementIterator("legend");i.hasNext();)

{

legend = (Element)i.next();

}

return legend;

}

* Write a XML file

public void FileWrite(Document document) throws IOException

{

FileWriter out = new FileWriter("C:/Dom2jSample.xml");

document.write(out);

out.close();

}

* Write a XML format file

public void XMLWrite(Document document) throws IOException

{

XMLWriter writer = new XMLWriter(new FileWriter("C:/Dom2jSampleStr.xml"));

writer.write(document);

writer.close();

}

相关问答

Q1: java查询数据写入xml

先用ajax发送异步请求到一个servlet或action

然后用action调用查询数据方法返回数据之后对数据进行迭代写入xml然后返回一个null就行了.

action代码

//设置xml头

response.setContentType ("text/xml; charset=UTF-8");

//设置不缓存 response.setHeader("cache-control","no-cache");

try

{

out=response.getWriter();

}

catch (IOException e)

{

e.printStackTrace();

}

Iterator ite=(Iterator)user.selectList(count);

Sysuser sysUser=null;

//写入xml

out.println("root");

while(ite.hasNext())

{

sysUser=(Sysuser)ite.next();

out.println("sysUser");

out.println("username");

out.println(sysUser.getUsername());

out.println("/username");

out.println("role");

out.println(sysUser.getSysrole().getRoleName());

out.println("/role");

out.println("popedom");

out.println(sysUser.getSysrole().getPopedom());

out.println("/popedom");

out.println("/sysUser");

}

out.println("/root");

out.close();

return null;

javascript代码

//初始化xmlHttpRequest

function init()

{

try

{

xmlHttpRequest= new XMLHttpRequest();

}

catch(e1)

{

try

{

xmlHttpRequest=new ActiveXObject("Msxml2.XMLHTTP");

}

catch(e)

{

xmlHttpRequest=new ActiveXObject("Microsoft.XMLHTTP");

}

//发送异步请求

function sendRequest()

{

init();

var url="/ManpowerResource/sysUserAjaxListAction.do?count="+count;

xmlHttpRequest.open('Get',url,true);

//设置回调函数

xmlHttpRequest.onreadystatechange=processRequest;

xmlHttpRequest.send(null);

}

//回调函数

function processRequest()

{

//判断返回状态 if(xmlHttpRequest.readyState==4)

{

if(xmlHttpRequest.status==200)

{

//获得返回的xml数据信息

var xmlDom=xmlHttpRequest.responseXML;

//前面定义的xml标签为:sysUser所以这里就获得sysUser这个节点

var sysUserDom=xmlDom.getElementsByTagName("sysUser");

//解析xml代码...........

for(var i=0;isysUserDom.length;i++)

{

.......

}

Q2: java如何向xml文件写入内容？

我以前学dom解析的时候写了一个小例子，你参考参考

package com.lhx.test;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Attr;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Text;

public class Test {

public static void main(String[] args) {

DocumentBuilderFactory fct=DocumentBuilderFactory.newInstance();

try {

DocumentBuilder bui=fct.newDocumentBuilder();

Document doc=bui.newDocument();

Element ps=doc.createElement("persons");

Element p1=doc.createElement("person");

Element p2=doc.createElement("person");

Attr id1=doc.createAttribute("id");

Attr id2=doc.createAttribute("id");

id1.setNodeValue("1");

id2.setNodeValue("2");

Element name1=doc.createElement("name");

Text na1=doc.createTextNode("龙大哥");

Element name2=doc.createElement("name");

Text na2=doc.createTextNode("龙大爷");

Element sex1=doc.createElement("sex");

Text se1=doc.createTextNode("帅哥");

Element sex2=doc.createElement("sex");

Text se2=doc.createTextNode("妹子");

doc.appendChild(ps);

ps.appendChild(p1);

p1.appendChild(name1);

p1.setAttributeNode(id1);

name1.appendChild(na1);

p1.appendChild(sex1);

sex1.appendChild(se1);

ps.appendChild(p2);

p2.appendChild(name2);

p2.setAttributeNode(id2);

name2.appendChild(na2);

p2.appendChild(sex2);

sex2.appendChild(se2);

try {

FileOutputStream fos=new FileOutputStream(new File("E:/longdada.xml"));

try {

((org.apache.crimson.tree.XmlDocument)doc)

.write(fos);

} catch (IOException e) {