DOM4j读取XML文件(SAXReader)

一、一个很好的SAXReader读写xml文件的例题;

总结:

Document document=new SAXReader.reader(“xml文路径/文件名xxx.xml”);//得到Document对象

Element root = document.getRootElement()//获得根节点

Iterator iterator=root.elementIterator(); //从根节点遍历子节点

Iterator iterator=Element.elementIterator(); //再从子节点在遍历其子节点

对节点访问其属性用:Attribute leaderAttr =Element. attribute(“xxx”);

对节点访问其某个属性leaderAttr的名称:leaderAttr.getName();
对节点访问其某个属性leaderAttr的值:leaderAttr.getValue()

对节点访问其名称:Element.getName();

对节点访问其文本:Element. getText();

 

简单代码为如下:

Document document=new SAXReader.reader(“xml文路径/文件名xxx.xml”);
Element root = document.getRootElement();  

HashMap hm = new HashMap<String,String>();   
for ( Iterator iter = root.elementIterator(); iter.hasNext(); )
{   Element element = (Element) iter.next();
    Attribute ageAttr=element.attribute("age");
        String age = ageAttr.getValue();   

      。。。。。

for ( Iterator iterInner = element.elementIterator(); iterInner.hasNext(); ) {   

    Element elementInner = (Element) iterInner.next();

    

//遍历college节点开始

if(elementInner.getName().equals("college")){

/添加college的文本

hm.put(elementInner.getName()+ num, elementInner.getText());

//添加college的leader属性

Attribute leaderAttr=elementInner.attribute("leader");

。。。。。如果leaderAttr不是空字符或者其值不为null。。。。。

hm.put(elementInner.getName() + "-"+leaderAttr.getName()+ num,

leaderAttr.getValue());

     }

else{ //遍历非college节点的其它节点   

     hm.put(elementInner.getName()+ num, elementInner.getText());   

}  

 

     

 

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

 

<students>  

    <student age="25"><!--如果没有age属性,默认的为20-->  

        <name>崔卫兵</name>  

        <college>PC学院</college>  

        <telephone>62354666</telephone>  

        <notes>男,1982年生,硕士,现就读于北京邮电大学</notes>  

    </student>  

    <student>  

        <name>cwb</name>  

        <college leader="学院领导">PC学院</college><!--如果没有leader属性,默认的为leader-->  

        <telephone>62358888</telephone>  

        <notes>男,1987年生,硕士,现就读于中国农业大学</notes>  

    </student>  

    <student age="45">  

        <name>xxxxx</name>  

        <college leader="">xxx学院</college>  

        <telephone>66666666</telephone>  

        <notes>注视中,注释中</notes>  

    </student>  

    <student age="">  

        <name>lxx</name>  

        <college>yyyy学院</college>  

        <telephone>88888888</telephone>  

        <notes>注视中111,注释中222</notes>  

    </student>  

</students>  



Dom4jReadExmple.java

package test2;

 

import java.io.File;   

import java.util.HashMap;   

import java.util.Iterator;   

import org.dom4j.Attribute;   

import org.dom4j.Document;   

import org.dom4j.DocumentException;   

import org.dom4j.Element;   

import org.dom4j.io.SAXReader;   

public class Dom4jReadExmple {    

public void iterateWholeXML(String filename,HashMap<String,String> hm){   

SAXReader saxReader = new SAXReader();   

try {   

   Document document = saxReader.read(new File(filename));   

   Element root = document.getRootElement();   

//   用于记录学生编号的变量   

   int num=-1;   

   //遍历根结点(students)的所有孩子节点(肯定是student节点)   

         for ( Iterator iter = root.elementIterator(); iter.hasNext(); ) {   

             Element element = (Element) iter.next();   

             num++;   

    // 获取person节点的age属性的值   

             Attribute ageAttr=element.attribute("age");   

    if(ageAttr!=null){   

     String age = ageAttr.getValue();   

     if (age != null&&!age.equals("")) {   

      hm.put(element.getName() + "-"+ageAttr.getName()+ num, age);   

     } else {   

      hm.put(element.getName() + "-" +ageAttr.getName()+ num, "20");   

     }   

    }else{   

     hm.put(element.getName() + "-age"+ num, "20");   

    }   

             //遍历student结点的所有孩子节点(即name,college,telphone,notes),并进行处理   

             for ( Iterator iterInner = element.elementIterator(); iterInner.hasNext(); ) {   

              Element elementInner = (Element) iterInner.next();   

              if(elementInner.getName().equals("college")){   

               hm.put(elementInner.getName()+ num, elementInner.getText());   

               //获取college节点的leader属性的值   

               Attribute leaderAttr=elementInner.attribute("leader");   

               if(leaderAttr!=null){   

       String leader = leaderAttr.getValue();   

       if (leader != null&&!leader.equals("")) {   

        hm.put(elementInner.getName() + "-"+leaderAttr.getName()+ num, leader);   

       } else {   

        hm.put(elementInner.getName() + "-" +leaderAttr.getName()+ num, "leader");   

       }   

               }else {   

       hm.put(elementInner.getName() + "-leader"+ num, "leader");   

      }   

              }else{   

               hm.put(elementInner.getName()+ num, elementInner.getText());   

              }   

             }   

         }   

  

} catch (DocumentException e) {   

   // TODO Auto-generated catch block   

   e.printStackTrace();   

}   

}   

}   

TestDom4jReadExmple.java

package dom4jExample.read;   

import java.util.HashMap;   

public class TestDom4jReadExmple {   

public static void main(String[] args) {   

     try{   

       //获取解析完后的解析信息   

       HashMap<String,String> hashMap;   

       Dom4jReadExmple drb=new Dom4jReadExmple();   

       //遍历整个XML文件   

       hashMap = new HashMap<String,String>();   

       drb.iterateWholeXML("studentInfo.xml", hashMap);   

       System.out.println("姓名\t年龄\t学院\t学院领导\t电话\t\t备注");   

       for(int i=0;i<hashMap.size();i+=6){   

         int j=i/6;   

         System.out.print(hashMap.get("name"+j)+"\t");   

         System.out.print(hashMap.get("student-age"+j)+"\t");   

         System.out.print(hashMap.get("college"+j)+"\t");   

         System.out.print(hashMap.get("college-leader"+j)+"\t");   

         System.out.print(hashMap.get("telephone"+j)+"\t");   

         System.out.println(hashMap.get("notes"+j)+"\t");   

       }   

     }catch(Exception ex){   

       ex.printStackTrace();   

     }   

   }   

}   

 

 

二、

一个读写操作的例子:

 

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.util.Iterator;

 

 

 

import org.dom4j.Document;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

 

 

public class testXml {

 

public static void main(String[] args) {

 

try {

 

testXml test = new testXml();

test.testWrite();

test.testRead();

 

} catch (Exception e) {

e.printStackTrace();

}

 

}

 

public void testRead() throws Exception{

 

SAXReader reader = new SAXReader();

Document document = reader.read(new FileInputStream("src/output.xml"));

 

 

Element root = document.getRootElement();

 

for (Iterator iter = root.elementIterator(); iter.hasNext();) {

Element element = (Element) iter.next();

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

System.out.println(element.attributeValue("name"));

System.out.println(element.attributeValue("blog"));

}

 

}

 

public void testWrite() throws Exception{

 

Document document = DocumentHelper.createDocument();

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

for(int i=0;i<10;i++){

 

 

Element element1 = root.addElement("user")

.addAttribute("name","Alex"+i)

.addAttribute("id", "id"+i)

.addText("我是信息");

}

 

XMLWriter writer = new XMLWriter(new FileOutputStream("src/output.xml"));

 

writer.write(document);

writer.close();

 

}

 

}

输出的效果:

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

<root>

<user name="Alex0" id="id0">我是信息</user>

<user name="Alex1" id="id1">我是信息</user>

<user name="Alex2" id="id2">我是信息</user>

<user name="Alex3" id="id3">我是信息</user>

<user name="Alex4" id="id4">我是信息</user>

<user name="Alex5" id="id5">我是信息</user>

<user name="Alex6" id="id6">我是信息</user>

<user name="Alex7" id="id7">我是信息</user>

<user name="Alex8" id="id8">我是信息</user>

<user name="Alex9" id="id9">我是信息</user>

</root>

 

 

本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/wlh269/archive/2008/08/31/2855461.aspx

posted @ 2011-11-17 09:51  java学弟  阅读(5633)  评论(0编辑  收藏  举报