DOM4J (Java code)

Import Java.io.File;


import Java.io.FileWriter;


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 Dom4jdemo {


　　


public boolean createxml (String fileName) {


Boolean isok= false;


//Establish Document Object


Document doc= documenthelper.createdocument ();


//create XML document root books


Element students= doc.addelement ("students");


students.addcomment ("This are a test for dom4j");//Join one line of comments


/** joins the first student node * * *


Element student= students.addelement ("student");/join the First Student node


Student.addattribute ("value", "God");//Add Value property and Values


Element name= student.addelement ("name");//Join name node


name.settext ("Finina");//Set value for name


Element age=student.addelement ("age");//Join the Age node


Age.settext ("25");//Set value for age


Element sex=student.addelement ("sex");/join Sex node


sex.settext ("male");//Set value for sex


/** joins the second student node * * *


student= students.addelement ("student");


Student.addattribute ("value", "cat");


name= student.addelement ("name");


Name.settext ("Fly");


age=student.addelement ("Age");


Age.settext ("17");


sex=student.addelement ("sex");


Sex.settext ("female");


/** Join the Team node * *


Element team=students.addelement ("team");


team.addtext ("05093A");


　　　/**


* Writes the contents of doc to the XML file


　　　　 **/


try{


OutputFormat format= Outputformat.createprettyprint ()//Formatting


format.setencoding ("GBK"), if necessary, cannot parse Chinese


//Output as file


XMLWriter writer= New XMLWriter (New FileWriter (fileName), format);


Writer.write (DOC);


Writer.flush ();


　　　　　//


isok= true;


}catch (Exception e) {


E.printstacktrace ();


　　　　}


return isOk;


　　}


public boolean modifigxml (String oldfilename,string newfilename) {


Boolean isok= false;


try{


saxreader reader= New Saxreader ()//create SAX Reader


document doc= Reader.read (new file (Oldfilename))//Read all file contents to live Document Object


/**: If the content of the Value property in the student node is God, modify it to King


* Because you can't be too arrogant


　　　　　　 */


List list= doc.selectnodes ("/students/student/@value")//Search out all students nodes under the student node in the location of the value attribute into the collection


iterator iter= List.iterator ()//load iterator


//Iteration Set


while (Iter.hasnext ()) {


attribute attr= (attribute) Iter.next ();


if (Attr.getvalue (). Equals ("God"))//ratio is equal to the value


Attr.setvalue ("King");/Set Value


　　　　　　}


list= doc.selectnodes ("/students/team")//Search out all the team node locations under the students node into the collection


iter= List.iterator ()//load iterator


//Iteration Set


if (Iter.hasnext ()) {


element team= (Element) Iter.next ();


team.settext ("05084A");/Set Value


Element teacher= team.addelement ("Teacher");//Add Node


Teacher.settext ("Godfather");//Set value for the new node


Teacher.addattribute ("Skill", "programme");//Add attributes to the new node


　　　　　　}


/** Modify the third: if the age content is 17, delete the node


* Minors need to be protected ...


　　　　　　*/


list= doc.selectnodes ("/students/student")//Search out all students node locations under student nodes into the collection


iter= List.iterator ()//load iterator


//Iteration Set


while (Iter.hasnext ()) {


element elem= (Element) Iter.next ();


iterator iterelem= elem.elementiterator ("age");//Generate an iterator for all the age nodes under the node


//Iteration Set


if (Iterelem.hasnext ()) {


element remtitle= (Element) Iterelem.next ();


if (Remtitle.gettext (). Equals ("17"))//Contrast value


Elem.remove (remtitle)//Remove the node


　　　　　　　　}


　　　　　　}


Write the contents of doc to the file


OutputFormat format= Outputformat.createprettyprint ()//Formatting


format.setencoding ("GBK"), if necessary, cannot parse Chinese


//Output as file, the above operation is only modified in memory, need to save as a file to confirm the modification


XMLWriter writer= New XMLWriter (New FileWriter (newfilename), format);


Writer.write (DOC);


Writer.flush ();


isok= true;


}catch (Exception e) {


E.printstacktrace ();


　　　　}


return isOk;


　　}


　/**


*the Method ReadXML


　　*/


public void ReadXML (String fileName) {


try{


file file= (filename);//Create a Document object


saxreader reader= New Saxreader ()//create SAX Reader


document doc= reader.read (file)//read content generate Document object


Element root= doc.getrootelement ();//Get root node


search (root);//start traversing


}catch (Exception e) {


E.printstacktrace ();


　　　　}


　　}


　　


//Recursive traversal


private void Search (Element root) {


iterator it_element= Root.elementiterator ()//To organize the elements contained under the root node into an iterator


//Iterative


while (It_element.hasnext ()) {


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


if (!element.gettext (). Equals (""))


　　　　　　{

The value of the
System.out.println (element.getname () + "node is" +element.gettext ());


　　　　　　}


Else


　　　　　　{


System.out.println (Element.getname () + "node");


　　　　　　}


iterator it_attr= element.attributeiterator ();


while (It_attr.hasnext ()) {


attribute attr= (attribute) It_attr.next ();


if (attr!=null)


　　　　　　　　{

The value of the
System.out.println (element.getname () + "node" +attr.getname () + "is" + attr.getvalue ());


　　　　　　　　}


　　　　　　}


search (element);//Recursive call


　　　　}


　　}


　/**


*the Method Main


　　*/


public static void Main (string[] args) {


long start= system.currenttimemillis ();/Start Timing


Dom4jdemo dom4jdemo= New Dom4jdemo ();


String filename= "Dom4jdemo.xml";


String newfilename= "New_dom4jdemo.xml";


System.out.println (filename+ "in the process of creating ...");


boolean isok_create= dom4jdemo.createxml (fileName);


if (isok_create) System.out.println (filename+ "Create success!");


Else System.out.println ("Create failed! Please try again after checking!");


　　　　


System.out.println ("in update ...");


boolean isok_modi= dom4jdemo.modifigxml (FileName, NewFileName);


if (isok_modi) System.out.println ("Congratulations, update complete!");


　　　//


System.out.println ("Reading Files" +filename+ "...");


System.out.println ("------------------------------------------------");


Dom4jdemo.readxml (fileName);


System.out.println ("------------------------------------------------");


System.out.println (filename+ "read success!");


System.out.println ("Reading Files" +newfilename+ "...");


System.out.println ("------------------------------------------------");


Dom4jdemo.readxml (NewFileName);


System.out.println ("------------------------------------------------");


SYSTEM.OUT.PRINTLN (filename+ "read success!");


System.out.println ("Time Consuming:" + (System.currenttimemillis ()-start) + "milliseconds!");


　　}


}