Four common parsing methods in Xml--java--dom

There are four types of parsing methods commonly used in Java:

Java comes with: Dom, Sax.

Plus bag: Jdom, dom4j.

1.Dom

The main way to build

Documentbuilderfactory dbf=documentbuilderfactory. newinstance ();

Documentbuilder db=dbf. Newdocumentbuilder ();

Document dm=db. Parse ("Rec\\books.xml");

Where the node class is the Nodes node collection class is NodeList

The attr Property collection is implemented with NamedNodeMap through getattributes () .

NodeList booklist=dmgetelementsbytagname("book");

NodeList childnodes = Book. Getchildnodes ();

Byte point childnodes Collection is implemented with Getchildnodes ()

Byte point I obtained by Childnodes.item (i)

The "set" length is implemented with Get.length ()

There are several types of node types that can be obtained by node.element_node

If you want to get the text in <name> data structure </name>

You need to get the text directly via Childnodes.item (k). Gettextcontent ()

or by Childnodes.item (k). Getfirstchild (). Getnodename. (text is considered a child node of the name label

Ps:xml spaces are treated as a node of the text type.

Example:

 Public classXmltest { PublicList<book>Books;  PublicXmltest () { This. books=NewArrayList (); }     Public Static voidMain (string[] args)throwsException {Xmltest test=NewXmltest (); inti=2005; intJ=i>>2;        System.out.println (j); Test.        Jiexi ();    Test.foreprint ();}  Public voidJiexi ()throwsexception{documentbuilderfactory dbf=documentbuilderfactory.newinstance (); Documentbuilder DB=Dbf.newdocumentbuilder (); Document DM=db.parse ("E:\\books.xml");//TODO auto-generated Method StubNodeList booklist=dm.getelementsbytagname ("book");  for(inti = 0; I < booklist.getlength (); i++) {Book Temp=NewBook (); Node Book=Booklist.item (i); NamedNodeMap Attrs=book.getattributes (); NodeList childnodes=book.getchildnodes ();  for(intk = 0; K < Childnodes.getlength (); k++) {                if(Childnodes.item (k). Getnodetype () = =Node.element_node) {                    if(Childnodes.item (k). Getnodename () = = "Name") Temp.name=Childnodes.item (k). Getn; if(Childnodes.item (k). Getnodename () = = "Years") Temp.years=Childnodes.item (k). Gettextcontent (); if(Childnodes.item (k). Getnodename () = = "Price") Temp.price=Childnodes.item (k). Gettextcontent ();        }} books.add (temp); }    }     Public voidForeprint () { for(book temp:books) {System.out.println ("------------"); System.out.println ("The title is:" +temp.name); System.out.println ("Year of publication:" +temp.years); System.out.println ("Price is:" +temp.price+ "Yuan"); }    }    }

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Four common parsing methods in Xml--java--dom