Java Starts from scratch 43 (dom4j parsing XML)

First, create XML

//Build XML     Public Static voidGernatorxml () {//Create Document ObjectDocument doc =documenthelper.createdocument (); //creating the root node studentsElement studentselement = doc.addelement ("Students"); //Creating child nodes studentElement studentElement1 = studentselement.addelement ("Student"); //Add id attributeStudentelement1.addattribute ("id", "1001"); //Add child nodesStudentelement1.addelement ("name"). SetText ("Zhang San")); Studentelement1.addelement ("Age"). SetText ("18"); Studentelement1.addelement ("Sex"). SetText ("male")); Studentelement1.addelement ("Phone"). SetText ("13800138000")); Studentelement1.addelement ("Address"). SetText ("Shenzhen Baoan"); //Create the same 2 student nodes againElement StudentElement2 = studentselement.addelement ("Student"); //Add id attributeStudentelement2.addattribute ("id", "10012"); //Add child nodesStudentelement2.addelement ("name"). SetText ("John Doe")); Studentelement2.addelement ("Age"). SetText ("19"); Studentelement2.addelement ("Sex"). SetText ("female")); Studentelement2.addelement ("Phone"). SetText ("13412369854")); Studentelement2.addelement ("Address"). SetText ("Shanghai")); //Create the same 2 student nodes againElement StudentElement3 = studentselement.addelement ("Student"); //Add id attributeStudentelement3.addattribute ("id", "10013"); //Add child nodesStudentelement3.addelement ("name"). SetText ("Harry")); Studentelement3.addelement ("Age"). SetText ("25"); Studentelement3.addelement ("Sex"). SetText ("female")); Studentelement3.addelement ("Phone"). SetText ("13410110104")); Studentelement3.addelement ("Address"). SetText ("Guangdong")); Try {            //Create XML writes document to XML//Set FormatOutputFormat format =Outputformat.createprettyprint (); //set character encoding can also be set to gb2312 or GBKFormat.setencoding ("Utf-8"); //inputXMLWriter writer =NewXMLWriter (NewFileWriter ("Xml/students.xml"), format); //Writing DocumentsWriter.write (DOC); //Close the streamWriter.close (); //Output HintsSystem.out.println ("====== Write succeeded ======="); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }    }

Second, parsing XML

    //Read XML     Public Static voidGetXML () {Try {            //Read XMLSaxreader reader =NewSaxreader (); Document Doc= Reader.read ("Xml/students.xml"); //Get root nodeElement root =doc.getrootelement (); //Get child node collectionList<element> stullist =root.elements (); //Traverse             for(Element ele:stullist) {//Get PropertiesString id = ele.attributevalue ("id"); System.out.println ("Student ID:" +ID); //gets the text content of the child node nameString name = Ele.elementtext ("name"); //AgeString age = Ele.elementtext (' Age '); //SexString sex = Ele.elementtexttrim ("Sex"); //PhoneString phone = Ele.elementtexttrim ("Phone"); //AddressString address = Ele.elementtexttrim ("Address"); System.out.println ("Name:" + name + "\ t Age:" + ages + "\ t gender:" + sex + "\t\t phone:" + phone + "\t\t Address:" +address); }        } Catch(documentexception e) {e.printstacktrace (); }    }

Third, increase the node

//Add a new node     Public Static voidAddxml () {Try {            //read XML Creation ParserSaxreader reader=NewSaxreader (); //Create Document ObjectDocument doc=reader.read ("Xml/students.xml"); //Get root nodeElement root=doc.getrootelement (); //Create a new nodeElement student=root.addelement ("Student"); //Add PropertyStudent.addattribute ("id", "10020"); //Create child nodesStudent.addelement ("name"). SetText ("Zhang San Feng"); Student.addelement ("Age"). SetText ("108"); Student.addelement ("Sex"). SetText ("male")); Student.addelement ("Phone"). SetText ("13800138001")); Student.addelement ("Address"). SetText ("Wudangshan")); //Write XML//set character encoding and formattingOutputFormat format=NewOutputFormat (); Format.setencoding ("Utf-8"); //Create an output streamXMLWriter writer=NewXMLWriter (NewFileWriter ("Xml/students.xml"), format); //Write DocumentWriter.write (DOC); //Close the streamWriter.close (); //give a hintSystem.out.println ("====== Added success ======="); } Catch(documentexception e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }            }

Four, modify the node

//Modify node Contents According to id10013 will Harry's name = Wang Xiao, age 30, Gender: Male, Tel: 138000138000, Address: Beijing     Public Static voidModify () {Try {            //creating the Saxreader parserSaxreader reader=NewSaxreader (); //Create documentDocument doc=reader.read ("Xml/students.xml"); //root node foundElement root=doc.getrootelement (); //Child node CollectionList<element> studentlist=root.elements (); //Traverse Lookup             for(Element ele:studentlist) {if(Ele.attributevalue ("id"). Equals ("10013")) {ele.element ("Name"). SetText ("Wang Xiao Wu")); Ele.element ("Age"). SetText ("30"); Ele.element ("Sex"). SetText ("male")); Ele.element ("Phone"). SetText ("138000138000")); Ele.element ("Address"). SetText ("Beijing")); }            }                //Write XML//set character formatting and encodingOutputFormat format=NewOutputFormat (); Format.setencoding ("Utf-8"); XMLWriter writer=NewXMLWriter (NewFileWriter ("Xml/students.xml"), format); //Write document toWriter.write (DOC); //Close the streamWriter.close (); //give a hintSystem.out.println ("= = = Modified = = = = ="); } Catch(documentexception e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }    }

V. Deleting a node XML

/removing nodes from Wang Xiao Delete node Public Static voidDelete () {Try {            //creating the Saxreader parserSaxreader reader=NewSaxreader (); //Create Document ObjectDocument doc=reader.read ("Xml/students.xml"); //Get root nodeElement root=doc.getrootelement (); //CollectionList<element> stulist=root.elements (); //Traverse             for(Element ele:stulist) {if(Ele.attributevalue ("id"). Equals ("10013"))){                    //Gets the parent node and deletes the nodeele.getparent (). Remove (Ele); }            }            //Write XML//set character encoding formatOutputFormat format =NewOutputFormat (); Format.setencoding ("Utf-8"); //output StreamXMLWriter writer=NewXMLWriter (NewFileWriter ("Xml/students.xml"), format);            Writer.write (DOC);            Writer.close (); System.out.println ("= = = Delete succeeded = = ="); } Catch(documentexception e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }    }

Java Starts from scratch 43 (dom4j parsing XML)