java 解析 xml

一、一個很好的SAXReader讀寫xml檔案的例題；

總結：

Document document=new SAXReader.reader(“xml文路徑/檔案名xxx.xml”);//得到Document對象

Element root = document.getRootElement()//獲得根節點

Iterator iterator=root.elementIterator(); //從根節點周遊子節點

Iterator iterator=Element.elementIterator(); //再從子節點在周遊其子節點

對節點通路其屬性用：Attribute leaderAttr =Element. attribute(“xxx”);

對節點通路其某個屬性leaderAttr的名稱：leaderAttr.getName()；

對節點通路其某個屬性leaderAttr的值：leaderAttr.getValue()

對節點通路其名稱：Element.getName();

對節點通路其文本：Element. getText();

簡單代碼為如下：

Document document=new SAXReader.reader(“xml文路徑/檔案名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();

//周遊college節點開始

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

/添加college的文本

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

//添加college的leader屬性

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

。。。。。如果leaderAttr不是空字元或者其值不為null。。。。。

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

leaderAttr.getValue());

     }

else{ //周遊非college節點的其它節點   

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

}  

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

<students>  

    <student age="25"><!--如果沒有age屬性，預設的為20-->  

        <name>崔衛兵</name>  

        <college>PC學院</college>  

        <telephone>62354666</telephone>  

        <notes>男,1982年生,碩士，現就讀于北京郵電大學</notes>  

    </student>  

    <student>  

        <name>cwb</name>  

        <college leader="學院上司">PC學院</college><!--如果沒有leader屬性，預設的為leader-->  

        <telephone>62358888</telephone>  

        <notes>男,1987年生,碩士，現就讀于中國農業大學</notes>  

    <student age="45">  

        <name>xxxxx</name>  

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

        <telephone>66666666</telephone>  

        <notes>注視中，注釋中</notes>  

    <student age="">  

        <name>lxx</name>  

        <college>yyyy學院</college>  

        <telephone>88888888</telephone>  

        <notes>注視中111，注釋中222</notes>  

</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();   

//   用于記錄學生編号的變量   

   int num=-1;   

   //周遊根結點（students）的所有孩子節點（肯定是student節點）   

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

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

             num++;   

    // 擷取person節點的age屬性的值   

             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");   

    }   

             //周遊student結點的所有孩子節點（即name，college，telphone，notes），并進行處理   

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

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

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

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

               //擷取college節點的leader屬性的值   

               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{   

              }   

             }   

         }   

} catch (DocumentException e) {   

   // TODO Auto-generated catch block   

   e.printStackTrace();   

}   

}    

TestDom4jReadExmple.java

package dom4jExample.read;   

public class TestDom4jReadExmple {   

public static void main(String[] args) {   

     try{   

       //擷取解析完後的解析資訊   

       HashMap<String,String> hashMap;   

       Dom4jReadExmple drb=new Dom4jReadExmple();   

       //周遊整個XML檔案   

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

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

       System.out.println("姓名\t年齡\t學院\t學院上司\t電話\t\t備注");   

       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、

一個讀寫操作的例子：

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("我是資訊");

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

writer.write(document);

writer.close();

輸出的效果：

<root>

<user name="Alex0" id="id0">我是資訊</user>

<user name="Alex1" id="id1">我是資訊</user>

<user name="Alex2" id="id2">我是資訊</user>

<user name="Alex3" id="id3">我是資訊</user>

<user name="Alex4" id="id4">我是資訊</user>

<user name="Alex5" id="id5">我是資訊</user>

<user name="Alex6" id="id6">我是資訊</user>

<user name="Alex7" id="id7">我是資訊</user>

<user name="Alex8" id="id8">我是資訊</user>

<user name="Alex9" id="id9">我是資訊</user>

</root>

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解析

Element root = document.getRootElement();//獲得根節點

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

List<Attribute> list = element.attributes();

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

Attribute attribute = list.get(i);

String val = attribute.getValue();

System.out.println(val);