java 解析 xml
引用：http://apps.hi.baidu.com/share/detail/33341278
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>
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解析
Element root = document.getRootElement();//获得根节点
Iterator iterator=root.elementIterator(); //从根节点遍历子节点
for ( Iterator iter = root.elementIterator(); iter.hasNext(); ){
Element element = (Element) iter.next();
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);
}
}