1.Why does only one copy of a servlet object get created?
What happens if you want to remove an old servlet object
currently running but do not want to stop the entire
servlet engine?
2.How does one servlet object deal with interactions from
many browser? (e.g. if your servlet ran an email site, how
can it keep track of hundreds of users logging in, reading
their mail, etc.)
Answer / Indu Gahlot
1. Only one copy of a servlet object is created because each time a client requests the servlet, a new instance is created to handle that request. If you want to remove an old servlet object without stopping the entire engine, you can use techniques like caching or pooling.n
2. A servlet object deals with multiple browser interactions using concurrent processing. Each servlet instance handles one request at a time, and when the request is completed, it's ready to handle another. For an email site, the servlet can maintain user sessions or use a database to keep track of users and their actions.
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plzzzzzzzzz xplain this code import java.awt.*; import java.util.Date; import java.awt.event.*; import java.awt.MenuItem.*; import java.sql.*; import sun.jdbc.odbc.*; import java.io.*; public class NewConnection extends Frame implements ActionListener { Label l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13; Button exit,save,bnext,top,prev,botm,ad,edit; TextField txtSvNo,txtConsNo,txtSvDt,txtConsName,txtAddr1,txtPhNo,txtCy lQty,txtCylDep,txtRegDep,txtRegQty,adr2,adr3,tot,stnry,rmrk; Date date=new Date(); String ConsName; String Addr1; public static void main(String sr[]) { new NewConnection().setVisible(true); } public NewConnection() { super("New Connection"); Statement stmt; ResultSet rs; //PreparedStatement pst; Connection con; try { Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); con=DriverManager.getConnection("jdbc:odbc:Agency"); if (con!=null); System.out.println ("connected"); stmt =con.createStatement (); } catch(Exception e1) { System.out.println (e1); } setSize(1280,800); setBackground(Color.lightGray); setLayout(null); l1=new Label("SV NO"); l1.setBounds(260,60,90,30); l1.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l1.setAlignment(Label.CENTER); add(l1); l2=new Label("CONSMR NO"); l2.setBounds(30,60,90,30); l2.setFont(new Font("TimesRoman",Font.PLAIN,15)); l2.setAlignment(Label.CENTER); add(l2); l3=new Label("SV DATE"); l3.setBounds(520,60,90,30); l3.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l3.setAlignment(Label.CENTER); add(l3); l4=new Label("NAME"); l4.setBounds(30,150,45,30); l4.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l4.setAlignment(Label.CENTER); add(l4); l5=new Label("ADRS"); l5.setBounds(30,220,45,30); l5.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l5.setAlignment(Label.CENTER); add(l5); l6=new Label("PH NO"); l6.setBounds(500,150,45,30); l6.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l6.setAlignment(Label.CENTER); add(l6); l7=new Label("CYLDR"); l7.setBounds(30,390,55,30); l7.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l7.setAlignment(Label.CENTER); add(l7); l8=new Label("DEPOSIT"); l8.setBounds(320,390,65,30); l8.setFont(new Font("TimesRoman",Font.PLAIN,15)); l8.setAlignment(Label.CENTER); add(l8); l9=new Label("DEPOSIT"); l9.setBounds(320,440,65,30); l9.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l9.setAlignment(Label.CENTER); add(l9); l10=new Label("RGLTR"); l10.setBounds(30,440,55,30); l10.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l10.setAlignment(Label.CENTER); add(l10); l11=new Label("TOTAL"); l11.setBounds(320,480,55,30); l11.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l11.setAlignment(Label.CENTER); add(l11); l12=new Label("Cur.Statn.NO."); l12.setBounds(290,550,85,30); l12.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l12.setAlignment(Label.CENTER); add(l12); l13=new Label("REMARKS"); l13.setBounds (30,630,85,30); l13.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l13.setAlignment (Label.CENTER); add(l13); txtSvNo=new TextField(); txtSvNo.setBounds(375,60,80,30); txtSvNo.setBackground(Color.white); add(txtSvNo); txtConsNo=new TextField(); txtConsNo.setBounds(130,60,80,30); txtConsNo.setBackground(Color.white); add(txtConsNo); txtSvDt=new TextField(); txtSvDt.setBounds(635,60,80,30); txtSvDt.setBackground(Color.white); add(txtSvDt); txtConsName=new TextField(); txtConsName.setBounds(100,150,200,30); txtConsName.setBackground(Color.white); add(txtConsName); txtAddr1=new TextField(); txtAddr1.setBounds(100,220,350,30); txtAddr1.setBackground(Color.white); add(txtAddr1); adr2=new TextField(); adr2.setBounds(100,250,350,30); adr2.setBackground(Color.white); add(adr2); adr3=new TextField(); adr3.setBounds(100,280,350,30); adr3.setBackground(Color.white); add(adr3); txtPhNo=new TextField(); txtPhNo.setBounds(570,150,150,30); txtPhNo.setBackground(Color.white); add(txtPhNo); txtCylQty=new TextField(); txtCylQty.setBounds(100,390,60,30); txtCylQty.setBackground(Color.white); add(txtCylQty); txtCylDep=new TextField(); txtCylDep.setBounds(410,390,60,30); txtCylDep.setBackground(Color.white); add(txtCylDep); txtRegDep=new TextField(); txtRegDep.setBounds(410,440,60,30); txtRegDep.setBackground(Color.white); add(txtRegDep); txtRegQty=new TextField(); txtRegQty.setBounds(100,440,60,30); txtRegQty.setBackground(Color.white); add(txtRegQty); tot=new TextField(); tot.setBounds(410,490,60,30); tot.setBackground(Color.white); add(tot); stnry=new TextField(); stnry.setBounds(410,550,60,30); stnry.setBackground(Color.white); add(stnry); rmrk=new TextField(); rmrk.setBounds(140,630,600,30); rmrk.setBackground(Color.white); add(rmrk); exit=new Button("EXIT"); exit.setBackground(Color.orange); exit.setBounds(760,700,40,40); exit.addActionListener(this); add(exit); save=new Button("SAVE"); save.setBackground(Color.orange); save.setBounds(715,700,40,40); save.addActionListener(this); add(save); bnext=new Button("NEXT"); bnext.setBackground(Color.orange); bnext.setBounds(90,700,40,40); bnext.addActionListener(this); add(bnext); top=new Button("TOP"); top.setBackground(Color.orange); top.setBounds(0,700,40,40); top.addActionListener(this); add(top); prev=new Button("PREV"); prev.setBackground(Color.orange); prev.setBounds(45,700,40,40); prev.addActionListener(this); add(prev); botm=new Button("BOTM"); botm.setBackground (Color.orange); botm.setBounds (135,700,40,40); botm.addActionListener (this); add(botm); ad=new Button("ADD"); ad.setBackground (Color.orange); ad.setBounds (300,700,40,40); ad.addActionListener (this); add(ad); edit=new Button("EDIT"); edit.setBackground (Color.orange); edit.setBounds (345,700,40,40); edit.addActionListener (this); add(edit); } public void actionPerformed(ActionEvent e) { if(e.getSource()==exit) { this.dispose(); System.exit(0); } if(e.getSource()==save) { try { Connection con=DriverManager.getConnection("jdbc:odbc:Agency"); PreparedStatement pst=con.prepareStatement("INSERT INTO NewCon values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"); pst.setInt (1,Integer.parseInt(txtConsNo.getText())); pst.setInt (2,Integer.parseInt(txtSvNo.getText())); pst.setString (3,txtSvDt.getText()); pst.setString (4,txtConsName.getText()); pst.setInt(5,Integer.parseInt (txtPhNo.getText())); pst.setString(6,txtAddr1.getText()); pst.setString(7,adr2.getText()); pst.setString(8,adr3.getText()); pst.setInt(9,Integer.parseInt (txtCylQty.getText())); pst.setInt(10,Integer.parseInt (txtCylDep.getText())); pst.setInt(11,Integer.parseInt (txtRegQty.getText())); pst.setInt(12,Integer.parseInt (txtRegDep.getText())); pst.setInt(13,Integer.parseInt (tot.getText())); pst.setInt(14,Integer.parseInt (stnry.getText())); pst.setString(15,rmrk.getText()); pst.executeUpdate (); con.close(); } catch(Exception e2) {System.out.println(e2);} } if(e.getSource()==ad) { int newcono=60000,newsvno=10000; System.out.println("entered if body"); try { System.out.println("entered the try:"); Connection con1=DriverManager.getConnection("jdbc:odbc:Agency"); Statement stmt1=con1.createStatement(); ResultSet rs1=stmt1.executeQuery("SELECT Cons_No,Sv_No FROM NewCon "); while(rs1.next()) { //System.out.println(rs1.getInt("Cons_No")); txtConsNo.setText(""+rs1.getInt(1)); txtSvNo.setText(""+rs1.getInt(2)); //newcono=rs1.getInt("Cons_No"); } //rs1.last(); newcono=Integer.parseInt(txtConsNo.getText ()); newsvno=Integer.parseInt(txtSvNo.getText ()); //newcono=rs1.getInt("Cons_No"); System.out.println(newcono); newcono=newcono+1; newsvno=newsvno+1; txtConsNo.setText (""+newcono); txtSvNo.setText(""+newsvno); txtSvDt.setText(""+ date); txtConsName.setText(""); txtAddr1.setText(""); txtPhNo.setText(""); txtCylQty.setText(""); txtCylDep.setText(""); txtRegDep.setText(""); txtRegQty.setText(""); adr2.setText(""); adr3.setText(""); tot.setText(""); stnry.setText(""); rmrk.setText(""); con1.close(); } catch(Exception e4){System.out.println (e4);} } if(e.getSource()==bnext) { try{ Connection con2=DriverManager.getConnection ("jdbc:odbc:Agency"); Statement stmt2=con2.createStatement (); ResultSet rs2=stmt2.executeQuery("SELECT * FROM NewCon "); rs2.next(); { txtConsNo.setText(rs2.getInt(1)+""); txtSvNo.setText (rs2.getInt(2)+""); txtSvDt.setText (rs2.getString(3)+""); txtConsName.setText (rs2.getString(4)+""); txtPhNo.setText (rs2.getInt(5)+""); txtAddr1.setText(rs2.getString(6)+""); adr2.setText (rs2.getString("Address2")+""); adr3.setText (rs2.getString("Address3")+""); txtCylQty.setText (rs2.getInt(9)+""); txtCylDep.setText (rs2.getInt(10)+""); txtRegDep.setText (rs2.getInt(11)+""); txtRegQty.setText (rs2.getInt(12)+""); tot.setText(rs2.getInt (13)+""); stnry.setText(rs2.getInt(14) +""); rmrk.setText(rs2.getString (15)+""); } } catch(Exception e5){} } } }
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