DOM4J manipulating XML

<?XML version= "1.0" encoding= "GBK"?>  <Persons>    < Men>        < PersonID= "20111907">Pan Teng</ Person>        < PersonID= "20111901">Rei</ Person>    </ Men>    <Women>        < PersonID= "20111908">Yang Yue</ Person>        < PersonID= "20111908">Zhang Dong Month</ Person>    </Women></Persons>

ImportJava.io.*;ImportJava.io.File;ImportJava.io.FileOutputStream; ImportJava.io.FileWriter; Importorg.dom4j.*;ImportOrg.dom4j.io.*;ImportJava.util.*;Importorg.jaxen.*; Public classDom_xml { Public Static voidMain (string[] args) {Try        {//read_xml1 ();//read_xml2 ();//READ_XML3 ();//read_xml4 ();//creatxml ();Modifyxml (); }        Catch(Exception e) {System.out.println ("Error message:" +e); }    }        /*** First way to use iterators to read XML*/     Public Static voidread_xml1 () {Try{Saxreader Reader=NewSaxreader ();//ParserDocument doc = Reader.read (NewFile ("Persons.xml"));//Document ObjectElement root = Doc.getrootelement ();//Get root element <persons>Iterator it = Root.elementiterator ();//<men> <women>             while(It.hasnext ()) {Element ele=(Element) it.next (); Iterator Sec_it=Ele.elementiterator ();  while(Sec_it.hasnext ()) {Element man= (Element) sec_it.next ();//without invoking the next method, you will not move down to create a dead loopString name =Man.getname (); String attr= Man.attributevalue ("id"); String content=Man.gettext (); System.out.println ("Name:" + name + "\nid:" + attr + "\ncontent:" +content); }            }        }        Catch(Exception e) {}}/*** The second way of elements*/     Public Static voidread_xml2 () {Try{Saxreader Reader=NewSaxreader ();//ParserDocument doc = Reader.read (NewFile ("Persons.xml"));//Document ObjectElement root = Doc.getrootelement ();//Get root element <persons>list<element> Listele = root.elements ("Men");//get all the men elements under rootlist<element> listmen = listele.get (0). Elements ("person");//get all the person elements under men              for(Element element_obj:listmen) {String name=Element_obj.getname (); String attr= Element_obj.attributevalue ("id"); String content=Element_obj.gettext (); System.out.println ("Name:" + name + "\nid:" + attr + "\ncontent:" +content); }        }        Catch(Exception e) {}}/*** Third Way to use adapter this is not understood for the time being*/     Public Static voidread_xml3 () {Try{Saxreader Reader=NewSaxreader ();//ParserDocument doc = Reader.read (NewFile ("Persons.xml"));//Document ObjectElement root = Doc.getrootelement ();//Get root element <persons>//The Third Way of adapterDoc.accept (NewVisitorsupport () {//use the child class of the observer to complete the reading of the XML file.                                        Public voidVisit (Element el) {//read the XML using the observation period. System.out.println (El.getname ()+": "+El.gettext ());        }                                     }); }        Catch(Exception e) {}}/*** Fourth Way selectnodes * selectnodes parameter is element path need to learn XPath related knowledge*/     Public Static voidRead_xml4 () {Try{Saxreader Reader=NewSaxreader ();//ParserDocument doc = Reader.read (NewFile ("Persons.xml"));//Document ObjectElement root = Doc.getrootelement ();//Get root element <persons>//fourth reading of XML using SelectNodes//need to import org.jaxen.* package or you will get an errorList List = Doc.selectnodes ("//persons/men/person");//use selectnodes to get the node for the XML you want to query.               for(Object obj:list) {//traverse the node to get the data within the node. Element el =(Element) obj;                  System.out.println (El.gettext ()); }        }        Catch(Exception e) {}}/*** Create XML file * XML file the first line encoding value is UTF-8 this is wrong * Java in the Windows Chinese version of the default is GBK, so you need to manually change*/     Public Static voidCreatxml () {Try{Document Newdoc=documenthelper.createdocument (); Element Persons= Newdoc.addelement ("Persons"); Element Men= Persons.addelement ("Men"); Element Person1= Men.addelement ("Person"); Person1.addattribute ("id", "20111907"); Person1.settext ("Panteng"); Element Person2= Men.addelement ("Person"); Person2.addattribute ("id", "20111901"); Person2.settext ("Leishuai"); File Newxml=NewFile ("Newfile.xml"); if(Newxml.exists ()) {newxml.delete ();    } newxml.createnewfile (); //Create a fileXMLWriter out =NewXMLWriter (NewFileWriter (newxml));            Out.write (Newdoc);            Out.flush ();            Out.close (); System.out.println ("File Creation Complete"); }        Catch(Exception e) {}}/*** Modify XML Delete node, modify Add Property*/     Public Static voidModifyxml () {Try{Saxreader Reader=NewSaxreader ();//ParserDocument doc = Reader.read (NewFile ("Persons.xml"));//Document ObjectElement root = Doc.getrootelement ();//Get root element <persons>Element men = root.element ("Men"); //Delete a Rei record elementIterator it =Men.elementiterator ();  while(It.hasnext ()) {Element ele=(Element) it.next (); if(Ele.gettext (). Equals ("Lei Shuai") {men.remove (ele); }            }            //increase the Wei man recordElement Weinan = men.addelement ("Person"); Weinan.settext ("Wai-Man"); //Modify the ID of the Pan Teng and increase the Age propertyIterator it2 =Men.elementiterator ();  while(It2.hasnext ()) {Element ele=(Element) it2.next (); if(Ele.gettext (). Equals ("Pan Teng") {ele.setattributevalue ("id", "080635"); Ele.addattribute ("Age", "23"); }} File Newxml=NewFile ("Newfile.xml"); if(Newxml.exists ()) {newxml.delete ();    } newxml.createnewfile (); //Create a fileXMLWriter out =NewXMLWriter (NewFileWriter (newxml));            Out.write (DOC);            Out.flush ();            Out.close (); System.out.println ("File Update Complete"); }        Catch(Exception e) {System.out.println ("Error message:" +e); }    }}

It is not difficult to see that the JAVA modification of the XML, actually modifies the Doc object, and then delete the original file, the object is written back to a file, the file name is the same as the original.

DOM4J manipulating XML