dom4j读写xml
dom4j生成xml与解析xml1、解析xml
<?xml version="1.0" encoding="gbk"?>
<a>
<user id="1">
<name>jack</name>
<age>23</age>
</user>
<user id="2">
<name>lucy</name>
<age>22</age>
</user>
</a>
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import java.io.File;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class MyXMLReader {
public static void main(String[] arge) {
try {
SAXReader reader=new SAXReader();
Document doc=reader.read(new File("c://test2.xml"));
Element root= doc.getRootElement();
Iterator iterator=root.elementIterator("user");
while(iterator.hasNext()){
Element user=(Element)iterator.next();
String id=user.attributeValue("id");
System.out.println("id号码:"+id);
String name=user.elementText("name");
System.out.println("用户名字："+name);
String age=user.elementText("age");
System.out.println("年龄："+age);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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2、生成xml文档与修改xml文档
import java.io.FileWriter;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class Dom4JXML {
public void createXML(){
Document doc=DocumentHelper.createDocument();
Element rootEle=doc.addElement("emps");
rootEle.addComment("这是一个dom4j生成的XML文件");
Element empEle=rootEle.addElement("emp");
empEle.addAttribute("id", "1");
Element nameEle=empEle.addElement("name");
nameEle.setText("jack");
Element sexEle=empEle.addElement("sex");
sexEle.addText("man");
try{
Writer out=new FileWriter("c://emps.xml");
OutputFormat format = OutputFormat.createPrettyPrint();
format.setIndent(true);
format.setNewlines(true); //设置换行
format.setEncoding("GBK");
XMLWriter writer=new XMLWriter(out,format);
writer.write(doc);
writer.close();
System.out.println("生成的emps.xml成功。");
}catch(Exception e){
e.printStackTrace();
}
}
public void updateXML(){
try {
SAXReader reader= new SAXReader();
Document doc=reader.read("c://emps.xml");
List listId=doc.selectNodes("//emps//emp//@id");
Iterator idIterator=listId.iterator();
while(idIterator.hasNext()){
Attribute attribute=(Attribute)idIterator.next();
attribute.setValue("001");
}
List listName=doc.selectNodes("//emps//emp//name");
Iterator nameIterator=listName.iterator();
while(nameIterator.hasNext()){
Element eleName= (Element)nameIterator.next();
eleName.setText("张三");
}
List listSex=doc.selectNodes("//emps//emp");
Iterator sexIterator=listSex.iterator();
while(sexIterator.hasNext()){
Element eleSex=(Element)sexIterator.next();
Iterator ite=eleSex.elementIterator("sex");
while(ite.hasNext()){
Element sexEle=(Element)ite.next();
eleSex.remove(sexEle);
}
}
Writer out=new FileWriter("c://emps(update).xml");
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK");
XMLWriter writer=new XMLWriter(out,format);
writer.write(doc);
writer.close();
System.out.println("生成的emps(update).xml成功。");
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args){
Dom4JXML dom4jxml=new Dom4JXML();
dom4jxml.createXML();
dom4jxml.updateXML();
}
}
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