Share very useful Java programs (critical code) (vi)---parse/read XML files (important)

Original: Share very useful Java program (key Code) (vi)---parse/read XML file (important)

XML file <?xml version= "1.0"?>  <students>      <student>          <name>John</name>          <grade>B</grade>          <age>12</age>      </student>      <student>          <name>Mary</name>          <grade>A</grade>          <age>11</age>      </student >      <student>          <name>Simon</name>          <grade>A</grade>          <age >18</age>      </student>  

Code for Java parsing:

Package net.viralpatel.java.xmlparser;   Import Java.io.File;  Import Javax.xml.parsers.DocumentBuilder;      Import Javax.xml.parsers.DocumentBuilderFactory;   Import org.w3c.dom.Document;   Import org.w3c.dom.Element;   Import Org.w3c.dom.Node;     Import org.w3c.dom.NodeList; public class Xmlparser {public void Getallusernames (String fileName) {try {documentbuilderfactory             DBF = Documentbuilderfactory.newinstance ();          Documentbuilder db = Dbf.newdocumentbuilder ();               File File = new file (fileName);            if (file.exists ()) {Document doc = db.parse (file);                     Element Docele = Doc.getdocumentelement ();                         Print root element of the document SYSTEM.OUT.PRINTLN ("root element of the document:" + Docele.getnodename ());       NodeList studentlist = docele.getelementsbytagname ("student"); Print total student elements in document SYSTEM.OUT.PRINTLN ("Total Students: "+ studentlist.getlength ()); if (studentlist! = null && studentlist.getlength () > 0) {for (int i = 0; i < studentlist.getlength (); i++                         ) {Node node = Studentlist.item (i);     if (node.getnodetype () = = Node.element_node) {System.out.println ("=====================");                              Element e = (element) node; NodeList NodeList = e.getelementsbytagname ("name");                    System.out.println ("Name:" + nodelist.item (0). Getchildnodes (). Item (0). Getnodevalue ());   NodeList = E.getelementsbytagname ("Grade"); System.out.println ("Grade:" + nodelist.item (0). Getchildnodes (). Item (0). Getnodevalue ()); nodeList =    E.getelementsbytagname ("Age");             System.out.println ("Age:" + nodelist.item (0). Getchildnodes (). Item (0). Getnodevalue ());        }}} else {system.exit (1);        }}} catch (Exception e) {System.out.println (e); }     } public static void Main (string[] args) {xmlparser parser = new Xmlparser ();     }parser.getallusernames ("C:\\test.xml"); }  } }

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Share very useful Java programs (critical code) (vi)---parse/read XML files (important)