Dom parsing XML document

Package COM. softeem. XML. util; import Java. io. file; import Java. util. hashmap; import Java. util. map; import javax. XML. parsers. documentbuilder; import javax. XML. parsers. documentbuilderfactory; import Org. w3C. dom. *; import COM. softeem. XML. dto. classdto; import COM. softeem. XML. dto. collegedto; import COM. softeem. XML. dto. studentdto; public class domparsexml {public static void main (string [] ARGs) throws exception {s Tring Path = "D:/stus. XML "; collegedto c = parsexml (PATH); // obtain information and print system. out. println (C. getclasses (). get ("Family Planning Class 1 "). getstus (). get ("20111114 "). getstuname ();} public static collegedto parsexml (string path) {collegedto college = NULL; try {// Dom parsing // ① load the parsed XML file // use the factory class to create the documentbuilder Class Object documentbuilderfactory factory = documentbuilderfactory. newinstance (); documentbuilder builder = factory. newdocumentbuilde R (); // call the parse method in the documentbuilder class. loading an XML file // DOM object is equivalent to an XML file document dom = builder. parse (new file (PATH); // ② extract the data of the XML file loaded in the DOM object sequentially. // getdocumentelement () method in the document class: get the root Tag Element root = Dom of the XML file. getdocumentelement (); // 1. get the getattribute method in the element property // element class: Get the attribute value from the current element object element based on the attribute name // system. out. println (root. gettagname (); // nodelist NS = root. getelementsbytagname ("class"); *********** string cid = Root. getattribute ("ID"); string cname = root. getattribute ("name"); // 2. obtain the sub-tag nodelist nodes = root of the element. getchildnodes (); // system. out. println (nodes. getlength (); Map <string, classdto> classes = new hashmap <string, classdto> (); For (INT I = 0; I <nodes. getlength (); I ++) {node = nodes. item (I); string nodename = node. getnodename (); // string nodevalue = node. getnodevalue (); // int nodetype = node. getnodety PE (); // return the short variable if ("class ". equals (nodename) {// namednodemap map = node. getattributes (); // node ATTR = map. getnameditem ("classname"); // string classname = ATTR. getnodevalue (); string classname = node. getattributes (). getnameditem ("classname "). getnodevalue (); string cnum = node. getattributes (). getnameditem ("classnum "). getnodevalue (); // obtain the node's subnode nodelist NS2. getchildnodes (); Map <string, studentdto> S Tus = new hashmap <string, studentdto> (); For (Int J = 0; j <ns2.getlength (); j ++) {node n = ns2.item (j ); if ("student ". equals (N. getnodename () {string snum = n. getattributes (). getnameditem ("stunum "). getnodevalue (); string sname = n. getattributes (). getnameditem ("stuname "). getnodevalue (); string ssex = n. getattributes (). getnameditem ("stusex "). getnodevalue (); string sage = n. getattributes (). getnameditem (" Stuage "). getnodevalue (); // put dtostudentdto Stu = new studentdto (snum, sname, ssex, integer. parseint (SAGE); stus. put (snum, Stu); // put a stu} classdto linoleic = new classdto (classname, integer. parseint (cnum), stus); classes. put (classname, CIA) ;}} college = new collegedto (integer. parseint (CID), cname, classes);} catch (exception e) {system. err. println ("error! ") ;}Return college ;}}

<! -- Stus. xml file --> <? XML version = "1.0" encoding = "UTF-8"?> <College ID = "1001" name = ""> <class classname = "Family Planning Class 1" classnum = "41"> <student stunum = "20111111" stuname = "" stusex = ""male" stuage = "20"/> <student stunum = "20111112" stuname = "" stusex = "male" stuage = "21"/> <student stunum = "20111113" stuname = "" stusex = "female" stuage = "20"/> <student stunum = "20111114" stuname = "" stusex = "male" stuage = "19"/> </class> <class classname = "network engineer Class 1" classnum = "49"> <student stunum = "20112111" stuname = "" stusex = "male" stuage = "21" /> <student stunum = "20112112" stuname = "" stusex = "male" stuage = "20"/> <student stunum = "20112113" stuname = "" stusex = "female "stuage =" 22 "/> </class> </College>

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Dom parsing XML document