Dom4J+XPath

第一步：引用jar包

dom4j-1.6.1.jar

jaxen-1.1-beta-6.jar(支持XPath必须的，否则会报错java.lang.NoClassDefFoundError: org/jaxen/JaxenException，此jar包可以从dom4j的lib文件夹中获得)

第二步：XPath基本语法

http://www.w3school.com.cn/xpath/index.asp

第三步：实例

users.xml

<? xml version="1.0" encoding="UTF-8" ?>

- < Users >

- < User id =" 0 " >

< Name > youchuancong </ Name >

< Age > 23 </ Age >

</ User >

- < User id =" 1 " >

< Name > cindy </ Name >

< Age > 23 </ Age >

</ User >

</ Users >

XMLTools.java
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class XMLTools {
public void creat(String filename){//创建xml文件
Document document = DocumentHelper.createDocument();
    Element usersElement = document.addElement("Users");

    Element userElement = usersElement.addElement("User");
    userElement.addAttribute("id", "0");

    Element nameElement=userElement.addElement("Name");
    nameElement.setText("youchuancong");

    Element ageElement=userElement.addElement("Age");
    ageElement.setText("23");

    Element userElement1 = usersElement.addElement("User");
    userElement1.addAttribute("id", "1");

    Element nameElement1=userElement1.addElement("Name");
    nameElement1.setText("cindy");

    Element ageElement1=userElement1.addElement("Age");
    ageElement1.setText("23");

   try{
   XMLWriter output = new XMLWriter(
           new FileWriter( new File(filename) ));
       output.write( document );
       output.close();
       }
    catch(IOException e){System.out.println(e.getMessage());}
}

public void read(String filename,String id) throws Exception{//根据id读出学生姓名
SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(new File(filename));
    Element e = (Element)document.selectSingleNode("/Users/User[@id='"+id+"']");
    Element name = e.element("Name");
    System.out.println("Name:"+name.getText());

}
public void readName(String filename) throws Exception{//读出所有学生的学生姓名
SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(new File(filename));
    List users = document.selectNodes("//Name");
    Iterator it = users.iterator();
    while(it.hasNext()){
     Element e = (Element)it.next();
     System.out.println("Name:"+e.getText());
    }



}
public void addUser(String filename,String id,String name,String age) throws Exception{
SAXReader saxReader = new SAXReader();//添加信息
    Document document = saxReader.read(new File(filename));
    Element e = (Element)document.selectSingleNode("/Users");
// Element e = document.getRootElement();
   Element user = e.addElement("User");
   user.setAttributeValue("id", id);
   user.addElement("Name").setText(name);
   user.addElement("Age").setText(age);

     XMLWriter output = new XMLWriter(
             new FileWriter( new File(filename) ));
         output.write( document );
         output.close();
}
public void readUser(String filename) throws Exception{//读出所有学生的基本信息
SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(new File(filename));
    List l = document.selectNodes("/Users/User");
    Iterator it = l.iterator();
    while(it.hasNext()){
     Element e = (Element)it.next();
     System.out.println("id:"+e.attributeValue("id"));
     Element name = e.element("Name");
     System.out.println("name:"+name.getText());
     Element age = e.element("Age");
     System.out.println("age:"+age.getText());
     System.out.println("#############################");
    }

}

public void delete(String filename,String id) throws Exception{//删除指定id的学生
SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(new File(filename));
    Element e = (Element)document.selectSingleNode("/Users/User[@id='"+id+"']");
    if(e!=null){
     Element parent = e.getParent();
     parent.remove(e);

      XMLWriter output = new XMLWriter(
               new FileWriter( new File(filename) ));
          output.write( document );
          output.close();
    }
}

public void readAll(String filename) throws Exception{//选取所有节点
SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(new File(filename));
    List users = document.selectNodes("//*");
    Iterator it = users.iterator();
    while(it.hasNext()){
     Element e = (Element)it.next();
     System.out.println("ElementName:"+e.getName()+"||value:"+e.getText());
    }



}
public void modify(String filename,String id,String name) throws Exception{//修改指定学号的学生姓名
SAXReader saxReader = new SAXReader();
    Document document = saxReader.read(new File(filename));
    Element e = (Element)document.selectSingleNode("/Users/User[@id='"+id+"']");
    Element n = e.element("Name");
    n.setText(name);

     XMLWriter output = new XMLWriter(
             new FileWriter( new File(filename) ));
         output.write( document );
         output.close();

}
}

XMLTest.java
public class XMLTest {
public static void main(String[] args) {
  XMLTools xml = new XMLTools();
  //xml.creat("users.xml");
  try {
   //xml.read("users.xml", "0");
   //xml.addUser("users.xml", "4", "no", "100");
   //xml.readUser("users.xml");
   //xml.readName("users.xml");
   xml.readAll("users.xml");
   //xml.modify("users.xml", "0", "helloworld");
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

}

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