Java read data from database generation XML saved to TreeMap

Package Data;import Java.io.stringwriter;import Java.sql.connection;import java.sql.drivermanager;import Java.sql.resultset;import Java.sql.statement;import Java.util.hashmap;import Javax.xml.parsers.DocumentBuilder; Import Javax.xml.parsers.documentbuilderfactory;import Javax.xml.transform.transformer;import Javax.xml.transform.transformerfactory;import Javax.xml.transform.dom.domsource;import Javax.xml.transform.stream.streamresult;import Org.w3c.dom.document;import Org.w3c.dom.element;public Class DataSet {Private Hashmap<string,string> TM = new hashmap<string,string> ();p ublic void init () {try{//1. Load driver Class.forName ("Com.mysql.jdbc.Driver");//2, get connectionstring URL = "Jdbc:mysql://localhost:3306/mydb"; Connection conn = drivermanager.getconnection (URL, "Neo", "Neo"),//3, creating Statementstatement stmt =conn.createstatement ( );//4, using statement to execute SqlString sql = "SELECT ID, Name, sex, age from user"; ResultSet rs = stmt.executequery (sql);D ocumentbuilderfactory dfact = DOCUMENTBUILDERFACTory.newinstance ();D Ocumentbuilder build = Dfact.newdocumentbuilder (); Transformerfactory tfact = Transformerfactory.newinstance (); while (Rs.next ()) {Document doc = build.newdocument (); Element user = doc.createelement ("user");d oc.appendchild (user); Element name = doc.createelement ("name"); Name.appendchild (Doc.createtextnode (rs.getstring (2)); User.appendchild ( name); Element sex = doc.createelement ("Sex"); Sex.appendchild (Doc.createtextnode (rs.getstring (3))); User.appendchild (Sex) ; Element age = doc.createelement (' age '); Age.appendchild (Doc.createtextnode (rs.getstring (4))); User.appendchild (age) ;           Transformer trans = Tfact.newtransformer ();  StringWriter writer = new StringWriter ();  Streamresult result = new Streamresult (writer);  Domsource Source = new Domsource (DOC); Trans.transform (source, result); String Skey = rs.getstring (1); String svalue = writer.tostring (); Tm.put (Skey, svalue);} Conn.close ();} catch (Exception e) {e.printstacktrace ();}} public string GetValue (string key) {return tm.geT (key);}}