為什么80%的碼農(nóng)都做不了架構(gòu)師？>>> ??

DOM4j讀取XML文件（SAXReader）

一、一個(gè)很好的SAXReader讀寫xml文件的例題；

總結(jié)：

Document document=new SAXReader.reader(“xml文路徑/文件名xxx.xml”);//得到Document對(duì)象

Element root = document.getRootElement()//獲得根節(jié)點(diǎn)

Iterator iterator=root.elementIterator(); //從根節(jié)點(diǎn)遍歷子節(jié)點(diǎn)

Iterator iterator=Element.elementIterator(); //再從子節(jié)點(diǎn)在遍歷其子節(jié)點(diǎn)

對(duì)節(jié)點(diǎn)訪問其屬性用：Attribute leaderAttr =Element. attribute(“xxx”);

對(duì)節(jié)點(diǎn)訪問其某個(gè)屬性leaderAttr的名稱：leaderAttr.getName()；
對(duì)節(jié)點(diǎn)訪問其某個(gè)屬性leaderAttr的值：leaderAttr.getValue()

對(duì)節(jié)點(diǎn)訪問其名稱：Element.getName();

對(duì)節(jié)點(diǎn)訪問其文本：Element. getText();

簡(jiǎn)單代碼為如下：

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

????

//遍歷college節(jié)點(diǎn)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不是空字符或者其值不為null。。。。。

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

leaderAttr.getValue());

???? }

else{ //遍歷非college節(jié)點(diǎn)的其它節(jié)點(diǎn)???

???? 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，默認(rèn)的為20-->??

??????? <name>崔衛(wèi)兵</name>??

??????? <college>PC學(xué)院</college>??

??????? <telephone>62354666</telephone>??

??????? <notes>男,1982年生,碩士，現(xiàn)就讀于北京郵電大學(xué)</notes>??

??? </student>??

??? <student>??

??????? <name>cwb</name>??

??????? <college leader="學(xué)院領(lǐng)導(dǎo)">PC學(xué)院</college><!--如果沒有l(wèi)eader屬性，默認(rèn)的為leader-->??

??????? <telephone>62358888</telephone>??

??????? <notes>男,1987年生,碩士，現(xiàn)就讀于中國農(nóng)業(yè)大學(xué)</notes>??

??? </student>??

??? <student age="45">??

??????? <name>xxxxx</name>??

??????? <college leader="">xxx學(xué)院</college>??

??????? <telephone>66666666</telephone>??

??????? <notes>注視中，注釋中</notes>??

??? </student>??

??? <student age="">??

??????? <name>lxx</name>??

??????? <college>yyyy學(xué)院</college>??

??????? <telephone>88888888</telephone>??

??????? <notes>注視中111，注釋中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();???

//?? 用于記錄學(xué)生編號(hào)的變量???

?? int num=-1;???

?? //遍歷根結(jié)點(diǎn)（students）的所有孩子節(jié)點(diǎn)（肯定是student節(jié)點(diǎn)）???

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

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

???????????? num++;???

??? // 獲取person節(jié)點(diǎn)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");???

??? }???

???????????? //遍歷student結(jié)點(diǎn)的所有孩子節(jié)點(diǎn)（即name，college，telphone，notes），并進(jìn)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());???

?????????????? //獲取college節(jié)點(diǎn)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{???

?????????????? 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{???

?????? //獲取解析完后的解析信息???

?????? HashMap<String,String> hashMap;???

?????? Dom4jReadExmple drb=new Dom4jReadExmple();???

?????? //遍歷整個(gè)XML文件???

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

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

?????? System.out.println("姓名\t年齡\t學(xué)院\t學(xué)院領(lǐng)導(dǎo)\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(gè)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("我是信息");

}

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

writer.write(document);

writer.close();

}

}

輸出的效果：

<?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>

轉(zhuǎn)載于:https://my.oschina.net/004/blog/102504

《新程序員》：云原生和全面數(shù)字化實(shí)踐50位技術(shù)專家共同創(chuàng)作，文字、視頻、音頻交互閱讀

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