Rookie how to learn XML (Java)

1. Reading XML

2. Writing XML

3. Create a new XML

4. Creating the Construction XML

To create a new XML document:

1/constructs an XML parser and creates a new document/21 Document document =NULL;32 Documentbuilderfactory factory =documentbuilderfactory.newinstance ();43Try {54 Documentbuilder builder =Factory.newdocumentbuilder ();65 document = Builder.newdocument ();//to create a new XML file76//document = Builder.parse (fileName);//parsing an existing XML file87}Catch(parserconfigurationexception e) {98e.printstacktrace ();Ten9}

Output the in-memory XML to the file:

1 //output the in-memory XML to the file2Transformer tf =NULL;3Transformerfactory TFF =transformerfactory.newinstance ();4         Try {5tf =Tff.newtransformer ();6Tf.transform (NewDomsource (document),NewStreamresult ("Src/test.xml"));7 8}Catch(transformerconfigurationexception e) {9 e.printstacktrace ();Ten}Catch(transformerexception e) { One e.printstacktrace (); A}

Building xml:

1Element root = document.createelement ("root");//creating the root directory2         3Element student = document.createelement ("Student");4         5Student.setattribute ("name", "Xiaoming");//set the property value of student6         7         /*to create a student child element*/8Element id = document.createelement ("id");9Element sex = document.createelement ("Sex");TenElement age = document.createelement (' Age '); One          A         /*set the text of an element*/ -Id.settextcontent ("0001"); -Sex.settextcontent ("Man"); theAge.settextcontent ("18"); -          -         /*to add a child element to a parent element (student)*/ - student.appendchild (ID); + student.appendchild (sex); - Student.appendchild (age); +          ARoot.appendchild (student);//Add an Element (node) student to the root directory (root) atDocument.appendchild (root);//Add the root directory to the document

Output Result:

1 <?XML version= "1.0" encoding= "UTF-8" standalone= "no"?>2 <Root>3     <Studentname= "Xiaoming">4         <ID>0001</ID>5         <Sex>Mans</Sex>6         < Age>18</ Age>7     </Student>8 </Root>

Get the data in the XML

1 <?XML version= "1.0" encoding= "UTF-8" standalone= "no"?><Root>2     <Studentname= "Xiaoming">3         <ID>0001</ID>4         <Sex>Mans</Sex>5         < Age>18</ Age>6     </Student>7     <Studentname= "Xiaozhu">8         <ID>0002</ID>9         <Sex>Mans</Sex>Ten         < Age>20</ Age> One     </Student> A     <Studentname= "Xiaohong"> -         <ID>0003</ID> -         <Sex>Female</Sex> the         < Age>15</ Age> -     </Student> - </Root>

Finding operations on XML

1 //get all the information for property name=xiaoming in student2NodeList List_st =document.getelementsbytagname ("Student");3         /*iterate through all the student elements*/4          for(intI=0;i<list_st.getlength (); i++)5         {6Node n =List_st.item (i);7             8Element student= (element) n;//must be strong to element to get properties set, node cannot get Properties9             Ten             /*Find the node of attribute xiaoming in student*/ One             if(Student.getattribute ("name"). Equals ("Xiaoming")) A             { -                 /*get text information from all tags*/ -String id = student.getelementsbytagname ("id"). Item (0). Gettextcontent (); theString sex = student.getelementsbytagname ("Sex"). Item (0). Gettextcontent (); -String age = Student.getelementsbytagname ("Age"). Item (0). Gettextcontent (); -                  -SYSTEM.OUT.PRINTLN ("ID:" +ID); +System.out.println ("Sex:" +sex); -System.out.println ("Age:" +Age ); +                 /*Output: A * id:0001 at * Sex:man - * age:18 -                  */ -             } -}

Rookie how to learn XML (Java)