java，c# 操作xml文件

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XML文件 poem.xml

<?xml version="1.0" encoding="UTF-8"?>
<poems>
<poem id="1" title="观沧海" author="曹操">
<content>树木丛生，百草丰茂。秋风萧瑟，洪波涌起。</content>
<explain>树木</explain>
</poem>
<poem id="2" title="饮酒" author="陶渊明">
<content>结庐在人境，而无车马喧。问君何能尔？心远地自偏。</content>
<explain>结庐</explain>
</poem>
</poems>

C#操作XML

引入命名空间

using System.IO;
using System.Xml;

static void Main(string[] args)
{
string idvalue = "1";
string titlevalue = "观沧海";
string authorvalue = "曹操";
string contentvalue = "树木丛生，百草丰茂。秋风萧瑟，洪波涌起。";
string explainvalue = "树木";
//新建对象
XmlDocument doc = new XmlDocument();
//如果poem.xml文件不存在,则重新创建并写入xml节点和根节点
if (!File.Exists("poem.xml"))
{
//XML版本和编码声明
doc.AppendChild(doc.CreateXmlDeclaration("1.0", "UTF-8", null));
//添加根元素
doc.AppendChild(doc.CreateElement("poems"));

//获取根节点
XmlNode rootpoems = doc.SelectSingleNode("/poems");
//新建poem节点
XmlNode newpoem = doc.CreateElement("poem");
//新建id属性
XmlAttribute tempatt = doc.CreateAttribute("id");
tempatt.Value = idvalue;
//添加属性
newpoem.Attributes.Append(tempatt);
tempatt = doc.CreateAttribute("title");
tempatt.Value = titlevalue;
newpoem.Attributes.Append(tempatt);
tempatt = doc.CreateAttribute("author");
tempatt.Value = authorvalue;
newpoem.Attributes.Append(tempatt);
XmlNode tempnode = doc.CreateElement("content");
tempnode.InnerText = contentvalue;
//添加节点
newpoem.AppendChild(tempnode);
tempnode = doc.CreateElement("explain");
tempnode.InnerText = explainvalue;
newpoem.AppendChild(tempnode);
rootpoems.AppendChild(newpoem);

//保存（若只访问，则不用保存）
doc.Save("poem.xml");
}
//加载xml文件
doc.Load("poem.xml");
//获取根节点
XmlNode poems = doc.SelectSingleNode("poems");
//获取poem节点集合
XmlNodeList poemss = poems.SelectNodes("poem");
//根据属性查找节点，若有多个，则SelectSingleNode方法返回第一个
XmlNode poemvalue1 = poems.SelectSingleNode("poem[@id='" + idvalue + "']");
//根据多属性查找节点
XmlNode poemvalue2 = poems.SelectSingleNode("poem[@id='" + idvalue + "' and @title='" + titlevalue + "']");
//根据子节点内容查找节点
XmlNode poemvalue3 = poems.SelectSingleNode("poem[explainvalue='" + explainvalue + "']");
//根据节点内容查找节点
XmlNode poemvalue4 = poems.SelectSingleNode("poem/content[text()='"+contentvalue+"']");
//查找最后一个节点
XmlNode poemvalue5 = poems.SelectSingleNode("poem[last()]");

//修改节点值
poemvalue4.InnerText = explainvalue;
//修改节点属性值
poemvalue1.Attributes["title"].Value = "sun";

//获取最后一个节点的id值
try
{
if (poemss.Count > 0)
idvalue = (Int32.Parse(poemss[poemss.Count - 1].Attributes["id"].Value) + 1).ToString();
}
catch { }
//删除第一个poem节点
poems.RemoveChild(poemss[0]);

//保存（若只访问，则不用保存）
doc.Save("poem.xml");
}

java操作XML

需要先导入dom4j和jaxen架包

免费下载地址：http://download.csdn.net/detail/houcunyue/5388367

引入命名空间

import java.io.File;
import java.io.FileWriter;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public static void main(String[] args) throws Exception {
String idvalue = "1";
String titlevalue = "观沧海";
String authorvalue = "曹操";
String contentvalue = "树木丛生，百草丰茂。秋风萧瑟，洪波涌起。";
String explainvalue = "树木";

//声明文档对象
Document doc=null;
//如果poem.xml文件不存在,则重新创建并写入xml节点和根节点
if (!new File("poem.xml").exists())
{
//创建xml
doc=DocumentHelper.createDocument();
//添加根元素
Element poems=doc.addElement("poems");
//新建poem节点，添加id，title，author属性。因为操作结果返回原节点，所以可连续添加。
Element poem=poems.addElement("poem").addAttribute("id", idvalue).addAttribute("title", titlevalue).addAttribute("author", authorvalue);
//添加子节点
Element content=poem.addElement("content");
//给节点赋值
content.setText(contentvalue);
Element explain=poem.addElement("explain");
explain.setText(explainvalue);

//保存xml文件
OutputFormat format = OutputFormat.createPrettyPrint();
//设置编码
format.setEncoding("UTF-8");
//写入
XMLWriter writer=new XMLWriter(new FileWriter(new File("poem.xml")), format);
writer.write(doc);
writer.close();
}
//新建对象
SAXReader reader=new SAXReader();
//加载xml文件
doc = reader.read(new File("poem.xml"));
//获取根节点
Element poems = (Element) doc.selectSingleNode("/poems");
//获取poem节点集合
List poemss = poems.selectNodes("poem");
//根据属性查找节点，若有多个，则SelectSingleNode方法返回第一个
Element poemvalue1 = (Element) poems.selectSingleNode("poem[@id='" + idvalue + "']");
//根据多属性查找节点
Element poemvalue2 = (Element) poems.selectSingleNode("poem[@id='" + idvalue + "' and @title='" + titlevalue + "']");
//根据子节点内容查找节点
Element poemvalue3 = (Element) poems.selectSingleNode("poem[explainvalue='" + explainvalue + "']");
//根据节点内容查找节点
Element poemvalue4 = (Element) poems.selectSingleNode("poem/content[text()='"+contentvalue+"']");
//获取最后一个节点
Element poemvalue5 = (Element) poems.selectSingleNode("poem[last()]");

//修改节点值
poemvalue4.setText(explainvalue);
  //修改节点属性值
poemvalue1.setAttributeValue("author", "sun");

//获取最后一个节点的id值
if (poemss.size() > 0)
idvalue = String.valueOf((Integer.parseInt(((Element)poemss.get(poemss.size() - 1)).attributeValue("id")) + 1));

//删除最后一个poem节点
poems.remove(poemvalue5);

//保存（若只访问，则不用保存）
  //设置编码
OutputFormat format = OutputFormat.createPrettyPrint();
//设置编码
format.setEncoding("UTF-8");
//写入
XMLWriter writer=new XMLWriter(new FileWriter(new File("poem.xml")), format);
writer.write(doc);
writer.close();
}