XML in Java

One: Read xml

1. Dom parsing
2. Sax parsing
3. DOM4J parsing
4. Jdom parsing

1.DOM parsing

<?XML version= "1.0" encoding= "UTF-8"?><Bookstore>    < BookID= "1">        <name>The song of Ice and Fire</name>        <author>George Martin</author>        < Year>2014</ Year>        < Price>89</ Price>    </ Book>    < BookID= "2">        <name>Andersen Fairy Tale</name>        < Year>2004</ Year>        < Price>77</ Price>        <language>中文版</language>    </ Book></Bookstore>

books.xml files such as

The parsing is as follows:

 Packagecom.imooc.domtest.test;Importjava.io.IOException;ImportJavax.xml.parsers.DocumentBuilder;Importjavax.xml.parsers.DocumentBuilderFactory;Importjavax.xml.parsers.ParserConfigurationException;Importorg.w3c.dom.Document;Importorg.w3c.dom.Element;ImportOrg.w3c.dom.NamedNodeMap;ImportOrg.w3c.dom.Node;Importorg.w3c.dom.NodeList;Importorg.xml.sax.SAXException; Public classDomtest { Public Static voidMain (string[] args) {//to create an Documentbuilderfactory objectDocumentbuilderfactory DBF =documentbuilderfactory.newinstance (); //to create an Documentbuilder object        Try {            //Create a Documentbuilder objectDocumentbuilder db =Dbf.newdocumentbuilder (); //loading the books.xml file into the current project through the parser method of the Documentbuilder objectDocument document = Db.parse ("books.xml"); //gets the collection of all book nodesNodeList Booklist = document.getElementsByTagName ("book"); //The length of the Booklist can be obtained by NodeList's GetLength () methodSystem.out.println ("A total" + booklist.getlength () + "book"); //traverse each book node             for(inti = 0; I < booklist.getlength (); i++) {System.out.println ("================= begins to traverse the" + (i + 1) + "The contents of this book ================="); //gets a book node with the item (i) method, with the index value of nodelist starting at 0Node book =Booklist.item (i);//gets all the property collections of the book NodeNamedNodeMap attrs =book.getattributes (); System.out.println ("No." + (i + 1) + "book Total" + attrs.getlength () + "Properties");//traversing the properties of a book                 for(intj = 0; J < Attrs.getlength (); J + +) {                    //get a property of a book node through the item (index) methodNode attr =Attrs.item (j); //Get Property nameSystem.out.print ("Property name:" +attr.getnodename ()); //Get Property valueSystem.out.println ("--attribute value" +Attr.getnodevalue ()); }//                //Prerequisite: You already know that the book node has and can only have 1 ID attributes//                //Convert a book node to an element type by forcing type conversion//element book = (element) booklist.item (i);//                //Get property values by GetAttribute ("id") method//String attrValue = book.getattribute ("id");//System.out.println ("The attribute value of the id attribute is" + attrValue); //parsing the child nodes of the book nodeNodeList childNodes =book.getchildnodes (); //Traverse childnodes to get the node name and node value for each nodeSystem.out.println ("i+1" + "book in total" +childnodes.getlength ()+ "Child Nodes");  for(intk = 0; K < Childnodes.getlength (); k++) {                    //distinguishes between node of type text and element type.                    if(Childnodes.item (k). Getnodetype () = =Node.element_node) {                        //Gets the node name of the element type nodeSystem.out.print ("First" + (k + 1) + "node name of node:" +Childnodes.item (k). Getnodename ());//Gets the node value of the element type nodeSystem.out.println ("--node value is:" +Childnodes.item (k). Getfirstchild (). Getnodevalue ());//System.out.println ("--node value is:" + Childnodes.item (k). Gettextcontent ());}} System.out.println ("====================== End Traversal" + (i + 1) + "contents of this book ================="); }        } Catch(parserconfigurationexception e) {e.printstacktrace (); }  Catch(saxexception e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }            }}

Two: Write XML

XML in Java