4th sem java record 2009

07MCA46: Java and J2EE Laboratory

1a. JAVA Program to demonstrate Constructor Overloading and Method Overloading.

class Cons { int a,b; Cons() { a=1; b=1; } Cons(int i) { a=i; b=i; } Cons(int x, int y) { a=x; b=y; } void disp() { System.out.println("\n\n No arguments Passed "); System.out.println("\n Value of a : " +a); System.out.println("\n Value of b : " +b); } void disp(int m) { System.out.println("\n\n Arument Passed : " +m); System.out.println("\n Value of a : " +a); System.out.println("\n Value of b : " +b); } }

class P1a { public static void main(String args[]) { Cons c1=new Cons(); Cons c2=new Cons(5); Cons c3=new Cons(10,20); c1.disp(); c2.disp(4); c3.disp(); } }

Department of MCA BMS College of Engineering


OUTPUT:

No arguments Passed

Value of a : 1

Value of b : 1

Arument Passed : 4

Value of a : 5

Value of b : 5

No arguments Passed

Value of a : 10

Value of b : 20



1b. JAVA Program to implement Inner class and demonstrate its Access Protections.

class Outer { int outer_x=100; void test() { Inner i1=new Inner(); i1.display(); } int y=10; class Inner { // int y=5; void display() { System.out.println("Display : outer_x = " +outer_x); } } void showy() { System.out.println("Value of Y : " +y); } }

class P1b { public static void main(String args[]) { Outer o=new Outer(); o.test(); } }

OUTPUT:

Display : outer_x = 100



2a. JAVA Program to implement Inheritance.

class Sup { int i,j; Sup(int a,int b) { i=a; j=b; } void displayij() { System.out.println("\n Value of i : " +i); System.out.println("\n Value of j : " +j); } }

class Sub extends Sup { int k; Sub(int a,int b,int c) { super(a,b); k=c; } void displayk() { System.out.println("\n Value of k : " +k); } void sum() { System.out.println("\n Sum of i,j and k : " +(i+j+k)); } }

class P2a { public static void main(String args[]) { Sub sbob=new Sub(10,20,30); Sup spob=new Sup(15,25); System.out.println("\n Contents of Super Class Object : "); spob.displayij(); System.out.println("\n Contents of Sub Class Object : "); sbob.displayij(); sbob.displayk(); System.out.println("\n After adding Sub Class Object : " ); sbob.sum(); } }



OUTPUT:

Contents of Super Class Object :

Value of i : 15

Value of j : 25

Contents of Sub Class Object :

Value of i : 10

Value of j : 20

Value of k : 30

After adding Sub Class Object :

Sum of i,j and k : 60



2b. JAVA Program to implement Exception Handling.

class P2b { public static void main(String args[]) { try { int a=args.length; int b=10/a; System.out.println("Length : " +a); try { if(a==1) a=a/(a-a); if(a==2) { int c[]={1}; c[2]=10; } try { int s; if(a>2) s=30/a; } finally { System.out.println("No Exception"); System.out.println(a+ " Command-line Arguments "); } } catch(ArrayIndexOutOfBoundsException e)

{ System.out.println("Array Index Out-of-Bound : " +e); }

} catch(ArithmeticException e)

{ System.out.println("Divide by 0 : " +e);

} } }



OUTPUT:

C:\jdk1.3\>javac P2b.java

C:\jdk1.3\>java P2bDivide by 0 : java.lang.ArithmeticException: / by zero

C:\jdk1.3\>java P2b aLength : 1Divide by 0 : java.lang.ArithmeticException: / by zero

C:\jdk1.3\>java P2b a bLength : 2Array Index Out-of-Bound : java.lang.ArrayIndexOutOfBoundsException

C:\jdk1.3\>java P2b a b cLength : 3No Exception3 Command-line Arguments

C:\jdk1.3\>java P2b a b c dLength : 4No Exception4 Command-line Arguments



3a. JAVA Program to create an Interface and implement it in a class.

interface Interf { void comput(int x, int y); }

class Add implements Interf { public void comput(int x, int y) { System.out.println("Sum : " +(x+y)); } }

class Mul implements Interf { public void comput(int x, int y) { System.out.println("Product : " +(x*y)); } }

class P3a { public static void main(String args[]) { Add a_obj=new Add(); Mul m_obj=new Mul(); Interf i; i=a_obj; i.comput(10,20); i=m_obj; i.comput(4,5); } }

OUTPUT:

Sum : 30Product : 20Press any key to continue . . .



3b. JAVA Program to create a class (extending Thread) and use methods Thread class to change name, priority of the current Thread and display the same.

class Five extends Thread { public void run() { for(int i=1;i<=10;i++) { System.out.println("5 X " +i+ " = " +5*i); if(i==5) yield(); } System.out.println("Out of class 5 "); } }

class Seven extends Thread { public void run() { for(int i=1;i<=10;i++) { System.out.println("7 X " +i+ " = " +7*i); if(i==3) stop(); } System.out.println("Out of class 7"); } }

class Nine extends Thread { public void run() { for(int i=1;i<=10;i++) { System.out.println("9 X " +i+ " = " +9*i); try { sleep(1000); } catch(Exception e) { } } System.out.println("Out of class 9"); } }



class P3b { public static void main(String args[]) { Five f=new Five(); Seven s=new Seven(); Nine n=new Nine(); n.setName("My"); n.setPriority(10); System.out.println("Thread " +n.getName()+ " has a priority of " +n.getPriority()); f.setPriority(1); f.start(); s.start(); n.start(); } }



OUTPUT:

Thread My has a priority of 107 X 1 = 79 X 1 = 97 X 2 = 145 X 1 = 57 X 3 = 215 X 2 = 105 X 3 = 155 X 4 = 205 X 5 = 255 X 6 = 305 X 7 = 355 X 8 = 405 X 9 = 455 X 10 = 50Out of class 59 X 2 = 189 X 3 = 279 X 4 = 369 X 5 = 459 X 6 = 549 X 7 = 639 X 8 = 729 X 9 = 819 X 10 = 90Out of class 9



4a. JAVA Program to create a Scrolling Text using JAVA Applets.

import java.awt.*;import java.applet.*;

/*<applet code="P4a" width=400 height=200> <param name=message value="BMS COLLEGE OF ENGINEERING"></applet>*/

public class P4a extends Applet implements Runnable { String msg; Thread t=null; int state; boolean stopFlag;

public void init() { setBackground(Color.cyan); setForeground(Color.blue); }

public void start() { msg=getParameter("message"); if(msg==null) msg="Message not found"; msg=" "+msg; t=new Thread(this); stopFlag=false; t.start(); }

public void run() { char ch; for( ; ; ) { try { repaint(); Thread.sleep(250); ch=msg.charAt(0); msg=msg.substring(1,msg.length()); msg+=ch; if(stopFlag) break; }



catch(InterruptedException e) { } } }

public void stop() { stopFlag=true; t=null; }

public void paint(Graphics g) { g.drawString(msg,100,100); } }



OUTPUT:



4b. JAVA Program to pass parameters to Applets and display the same.

import java.awt.*;import java.applet.*;

/*<applet code="P4b" width=400 height=200> <param name=fontName value=Courier> <param name=fontSize value=14> <param name=leading value=2> <param name=accountEnabled value=true></applet>*/

public class P4b extends Applet { String fontName; int fontSize; float leading; boolean active;

public void start() { String param; fontName=getParameter("fontName"); if(fontName==null) fontName="Not Found"; param=getParameter("fontSize"); try { if(param!=null) fontSize=Integer.parseInt(param); else fontSize=0; } catch(NumberFormatException e) { fontSize=-1; } param=getParameter("leading"); try { if(param!=null) leading=Float.valueOf(param).floatValue(); else leading=0; } catch(NumberFormatException e) { leading=0; }



param=getParameter("accountEnabled"); if(param!=null) active=Boolean.valueOf(param).booleanValue(); } public void paint(Graphics g) { g.drawString("Font Name : " +fontName,100,40); g.drawString("Font Size : " +fontSize,100,80); g.drawString("Leading : " +leading,100,120); g.drawString("Account Active : " +active,100,160); } }



OUTPUT:



5. Write a JAVA Program to insert data into Student DATA BASE and retrieve info base on particular queries (Using JDBC Design Front end using Swings).

lab5.java

import javax.swing.*;import java.awt.event.*;import java.awt.*;import java.sql.*;

class Inpscr extends JFrame implements ActionListener{

private Toolkit toolkit;

JLabel head = new JLabel("STUDENT DETAIL "); JLabel label1 = new JLabel("Student id "); JLabel label2 = new JLabel("Name "); JLabel label3 = new JLabel("Address "); JLabel label4 = new JLabel("Dob "); JLabel label5 = new JLabel("Sex "); JLabel label6 = new JLabel("Phone no ");

JTextField text1 = new JTextField();JTextField text2 = new JTextField();JTextField text3 = new JTextField();JTextField text4 = new JTextField();JTextField text5 = new JTextField();JTextField text6 = new JTextField();

JButton next = new JButton("NEXT");JButton close = new JButton("CLOSE");JButton save = new JButton("SAVE");JButton reset = new JButton("RESET");JButton ok = new JButton("OK");JButton del = new JButton("Delete");JButton updat = new JButton("Update");JButton click = new JButton("Click");JPanel panel = new JPanel();

//static String userid="system", password = "jitu";static String url = "jdbc:odbc:Girish";static Connection con = null;static Statement smnt,smnt1;static ResultSet rs,rs1;String id,sid,nam,ad,se,ph,db;

Inpscr() { setTitle("Data Base Connectivity"); setSize(300, 300); toolkit = getToolkit(); Dimension size = toolkit.getScreenSize();



setLocation((size.width - getWidth())/2, (size.height - getHeight())/2); setDefaultCloseOperation(EXIT_ON_CLOSE);

getContentPane().add(panel); panel.setLayout(null);

head.setBounds(100, 5, 150, 20); label1.setBounds(20, 40, 80, 20); text1.setBounds(100, 40, 80, 20);

panel.add(head); panel.add(label1); panel.add(text1); panel.add(close); close.addActionListener(this);

}

public void setfields() { label2.setBounds(20, 70, 80, 20); text2.setBounds(100, 70, 80, 20);

label3.setBounds(20, 100, 80, 20); text3.setBounds(100, 100, 80, 20); label4.setBounds(20, 130, 80, 20); text4.setBounds(100, 130, 80, 20); label5.setBounds(20, 160, 80, 20); text5.setBounds(100, 160, 80, 20); label6.setBounds(20, 190, 80, 20); text6.setBounds(100, 190, 80, 20); panel.add(label2); panel.add(label3); panel.add(label4); panel.add(label5); panel.add(label6); panel.add(text2); panel.add(text3); panel.add(text4); panel.add(text5); panel.add(text6); }public boolean showspec() { String s; try {

s=text1.getText(); String creat="select * from emp1" +" " + "where s_id="+s; smnt=con.createStatement(); rs = smnt.executeQuery(creat); if(rs.next()) { setfields(); showRecord(rs); }



else { JOptionPane.showMessageDialog(null,"Record Not Found"); return false; }

}catch(Exception ee)

{ System.out.println("Error" +ee);}

return true;}

}public void Display()

{try {

String creat="select * from emp1"; smnt=con.createStatement(); rs = smnt.executeQuery(creat); rs.next(); }catch(Exception ee) {System.out.println("Error" +ee);}showRecord(rs) ;}

public void showRecord(ResultSet rs) {

String str;try { //text1.setText(Integer.toString(rs.getInt(1))); text1.setText(rs.getString(1)); text2.setText(rs.getString(2)); text3.setText(rs.getString(3)); str=rs.getString(4); text4.setText(str.substring(0,10)); text5.setText(rs.getString(5)); text6.setText(rs.getString(6)); text1.setEditable(false); text2.setEditable(false); text3.setEditable(false); text4.setEditable(false); text5.setEditable(false); text6.setEditable(false); }catch(Exception ee) {}}

public void setcomp(){next.setBounds(60, 240, 80, 20);

close.setBounds(150, 240, 80, 20);panel.add(next);next.addActionListener(this);}



public void setcomp1(){

save.setBounds(10, 240, 80, 20); reset.setBounds(110, 240, 80, 20); close.setBounds(200, 240, 80, 20);

panel.add(save);save.addActionListener(this);panel.add(reset);reset.addActionListener(this);}

public void setcomp2(){ok.setBounds(60, 240, 80, 20);

close.setBounds(150, 240, 80, 20);panel.add(ok);ok.addActionListener(this);}

public void setcomp3(){del.setBounds(60, 240, 80, 20);

close.setBounds(150, 240, 80, 20);panel.add(del);del.addActionListener(this);}

public void setcomp4(){click.setVisible(false);updat.setBounds(60, 240, 80, 20);

close.setBounds(150, 240, 80, 20);panel.add(updat);updat.addActionListener(this);}

public void setcomp5(){click.setBounds(60, 240, 80, 20);

panel.add(click);click.addActionListener(this);}

public void actionPerformed(ActionEvent ee){if(ee.getSource() == next) {try { rs.next(); showRecord(rs); }catch(Exception e) {}}if(ee.getSource() == ok) {try { showspec(); }catch(Exception e) {}



}

if(ee.getSource() == close) {try { setVisible(false); smnt.close(); con.close(); }catch(Exception e) {}}if(ee.getSource() == save) {

getval();Setquery();

}if(ee.getSource() == reset) {

Reset(); }if(ee.getSource() == del) {

del_rec(); }if(ee.getSource() == updat) {

getval();Setupdat();

}if(ee.getSource() == click) {

updat_rec(); }

}public void updat_rec() { //String sid; sid=text1.getText(); if(showspec())

{ text1.setEditable(true); text2.setEditable(true); text3.setEditable(true); text4.setEditable(true); text5.setEditable(true); text6.setEditable(true); setcomp4(); getval(); }/*try {

del = "delete from emp1 where s_id="+id;smnt1=con.createStatement();rs1= smnt1.executeQuery(del);

}catch(Exception ex){}*/

}



public void Setupdat() { String d; d=db.substring(5,10)+"-"+db.substring(0,4); try {

String creat="update emp1 set s_id='"+id+"',name='"+nam+"',adr='"+ad+"',dob='"+d+"',sex='"+se+"',phone='"+ph+"' where s_id='"+sid+"'";

smnt=con.createStatement();rs = smnt.executeQuery(creat);}catch(Exception ex){System.out.println(ex); }

}public void del_rec()

{ String del,ser; id=text1.getText(); try {

del = "delete from emp1 where s_id="+id; ser = "select * from emp1 where s_id="+id; smnt1=con.createStatement(); rs1= smnt1.executeQuery(ser); if((rs1.next())) { JOptionPane.showMessageDialog(null,"Record deleted"); smnt=con.createStatement(); rs = smnt.executeQuery(del); }else { JOptionPane.showMessageDialog(null,"Record Not Found"); }

}catch(Exception ex) {}

}public void Reset() { text1.setText(""); text2.setText(""); text3.setText(""); text4.setText(""); text5.setText(""); text6.setText(""); }public void getval() { id=text1.getText(); nam=text2.getText(); ad=text3.getText(); db=text4.getText();



se=text5.getText(); ph=text6.getText(); System.out.println(nam); System.out.println(se); }public void Setquery()

{ String creat; try {

creat = "insert into emp1(s_id,name,adr,dob,sex,phone)" + "values(?,?,?,?,?,?)"; PreparedStatement ps = con.prepareStatement(creat);

ps.setString(1, id); ps.setString(2, nam); ps.setString(3, ad); ps.setString(4, db); ps.setString(5, se); ps.setString(6, ph); ps.executeUpdate(); }

catch(Exception ex) { System.err.println("SQLException: " + ex.getMessage()); }

}public void connect() { Connection con = getOracleJDBCConnection(); if(con!= null) { System.out.println("Got Connection."); } else { System.out.println("Could not Get Connection"); } }public static Connection getOracleJDBCConnection()

{ try {

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); }

catch(java.lang.ClassNotFoundException e) { } try {

con = DriverManager.getConnection(url); }

catch(SQLException ex) {

System.err.println("SQLException: " + ex.getMessage()); }

return con;}

}



class Windowscr extends JFrame implements ActionListener { JMenuBar menu = new JMenuBar(); JMenu file = new JMenu("File"); JMenu insert = new JMenu("Insert"); JMenu view = new JMenu("View"); JMenu update = new JMenu("Update"); JMenuItem fileclose = new JMenuItem("Close"); JMenuItem insertrec = new JMenuItem("Record"); JMenuItem viewinfo = new JMenuItem("Specific Record"); JMenuItem viewallinfo = new JMenuItem("All record"); JMenuItem delete = new JMenuItem("Delete Record"); JMenuItem modify = new JMenuItem("Modify record"); Windowscr()

{setTitle("STUDENT DATABASE");file.setMnemonic(KeyEvent.VK_F);insert.setMnemonic(KeyEvent.VK_I);view.setMnemonic(KeyEvent.VK_V);fileclose.setMnemonic(KeyEvent.VK_C);insertrec.setMnemonic(KeyEvent.VK_R);viewinfo.setMnemonic(KeyEvent.VK_S);viewallinfo.setMnemonic(KeyEvent.VK_A);update.setMnemonic(KeyEvent.VK_U);delete.setMnemonic(KeyEvent.VK_D);modify.setMnemonic(KeyEvent.VK_M);file.add(fileclose);insert.add(insertrec);view.add(viewinfo);view.add(viewallinfo);update.add(delete);update.add(modify);menu.add(file);menu.add(insert);menu.add(view);menu.add(update);setJMenuBar(menu);

setSize(360, 250); setLocationRelativeTo(null); setDefaultCloseOperation(EXIT_ON_CLOSE);

fileclose.addActionListener(this);insertrec.addActionListener(this);viewinfo.addActionListener(this);viewallinfo.addActionListener(this);delete.addActionListener(this);modify.addActionListener(this);}

public void actionPerformed(ActionEvent e){if(e.getSource() == fileclose) {

System.exit(0);}



if(e.getSource() == insertrec) {Inpscr i = new Inpscr();i.setfields();i.setcomp1();i.connect();i.setVisible(true);

}if(e.getSource() == viewallinfo) {

Inpscr i1 = new Inpscr();i1.setfields();i1.setcomp();i1.connect();i1.setVisible(true);i1.Display();}

if(e.getSource() == viewinfo) {Inpscr i2 = new Inpscr();i2.setcomp2();i2.connect();i2.setVisible(true);

}if(e.getSource() == delete ) {

Inpscr i3 = new Inpscr();i3.setcomp3();i3.connect();i3.setVisible(true);}

if(e.getSource() == modify) {Inpscr i4 = new Inpscr();i4.setcomp5();i4.connect();i4.setVisible(true);}

}

}public class lab5{

public static void main(String arg[]) {

{Windowscr w = new Windowscr();w.setVisible(true);}

}



OUTPUT:



6. Write a JAVA Program to implement Client Server (Client requests a file,Server responds to client with contents of that file which is then display on the screen by Client – Socket Programming).

Client.java

import java.io.*; import java.net.*;

public class Client { public static void main(String args[]) throws IOException { Socket cs = new Socket("127.0.0.1",8090);

BufferedReader in=new BufferedReader(new InputStreamReader(cs.getInputStream())); BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));

System.out.print("Enter the file name : "); String fname=stdin.readLine(); byte buf[]=fname.getBytes();

OutputStream out=cs.getOutputStream(); out.write(buf);

String str; while((str=in.readLine())!=null) { System.out.println(str); } cs.close(); } }



Server.java

import java.io.*;import java.net.*;

public class Server { public static void main(String args[]) throws IOException { byte buf[]=new byte[20];

ServerSocket ss = new ServerSocket(8090); Socket cs = ss.accept(); System.out.println("Server is running........");

InputStream in=cs.getInputStream(); in.read(buf);

String fname = new String(buf); BufferedReader stdin= new BufferedReader(new InputStreamReader(System.in)); PrintWriter out = new PrintWriter(cs.getOutputStream(),true);

File f = new File(fname); if(f.exists()) { BufferedReader fr= new BufferedReader(new FileReader(fname)); String line;

while((line=fr.readLine())!=null) { out.println(line); } fr.close(); } ss.close(); cs.close(); } }



OUTPUT:

C:\>javac Server.java

C:\>javac Client.java

C:\>java ServerServer is running........

C:\>java ClientEnter the file name : color.html

<html><body><center><form name="form1" action="http://localhost:8090/servlet/Color"><B>color:</B><input type=text name="color" /><br><br><input type=submit value="submit"></form></body></html>



7. Write a JAVA Program to implement a simple Client Server Application using RMI.

AddServerIntf.java

import java.rmi.*; public interface AddServerIntf extends Remote { double add(double d1 , double d2) throws RemoteException ; }

AddServerImpl.java

import java.rmi.*;import java.rmi.server.*;public class AddServerImpl extends UnicastRemoteObject implements AddServerIntf { public AddServerImpl() throws RemoteException { } public double add(double d1, double d2) throws RemoteException { return d1 + d2; } }

AddClient.java

import java.rmi.*;public class AddClient { public static void main(String args[] ) {

try {String serverURL = "rmi://" + args[0] + "/AddServer";AddServerIntf addServerIntf=(AddServerIntf)Naming.lookup(serverURL);

System.out.println("First no. x : " +args[1]);double d1 = Double.valueOf(args[1]).doubleValue();

System.out.println("Second no. y : " +args[2]);double d2 = Double.valueOf(args[2]).doubleValue();

System.out.println("Result of d1 + d2 : " + addServerIntf.add(d1 , d2)); } catch(Exception e) {

System.out.println("ERROR ! " + e);}

} }



AddServer.java

import java.net.*;import java.rmi.*;

public class AddServer { public static void main(String args[]) {

try { AddServerImpl addServerImpl = new AddServerImpl();

Naming.rebind("AddServer" , addServerImpl); }catch(Exception e)

{ System.out.println("ERROR ! " + e);

}}

}



OUTPUT:

C:\>javac AddServerIntf.java

C:\>javac AddServerImpl.java

C:\>javac AddServer.java

C:\>javac AddClient.java

C:\>rmic AddServerImpl

C:\>start rmiregistry

C:\>java AddServer

C:\>java AddClient 127.0.0.1 5 6

First no. x : 5

Second no. y : 6

Result of d1 + d2 : 11.0



8. Write a JAVA Servlet Program to implement a dynamic HTML using Servlet (user name and password should be accepted using HTML and displayed using a Servlet).

Lab8.html

<html><head><title>Lab8</title></head><body><h2> User details</h2><form method="post" action="http://localhost:8090/servlet/lab8" > <hr /> <h3> Enter user name::</h3><input type="text" name="uname" /><br /><br /><h3>Enter Password::</h3><input type="password" name="uadd" /><br /><br /><input type="submit" value="Display" /><input type="reset" value="Clear" /></form></body></html>

lab8.java

import java.lang.*;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;

public class lab8 extends HttpServlet {

public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException

{ PrintWriter out=res.getWriter(); String unam=req.getParameter("uname"); String uaa=req.getParameter("uadd"); out.println("<HTML><BODY>"); out.println("<h1> USER INFORMATION</h1><hr />"); out.println("User name:: "+unam+"<br>"); out.println("Password:: "+uaa+"<br>"); out.println("</BODY></HTML>"); } }



OUTPUT:

Procedure to Excecute: 1. Compile lab8.java2. Copy lab8.class file to C:\JSDK2.0\examples\3. Run servletrunner with –p option and 8090 port number4. Open lab8.html file5. Enter user name and password and click Display

C:\>javac lab8.java

C:\>servletrunner -p 8090 servletrunner starting with settings: port = 8090 backlog = 50 max handlers = 100 timeout = 5000 servlet dir = .\examples document dir = .\examples servlet propfile = .\examples\servlet.properties



C:\>servletrunner -p 8090 servletrunner starting with settings: port = 8090 backlog = 50 max handlers = 100 timeout = 5000 servlet dir = .\examples document dir = .\examples servlet propfile = .\examples\servlet.properties lab8: init



9. Write a JAVA Servlet Program to Download a file and display it on the screen (A link has to be provided in HTML, when the link is clicked corresponding file has to be displayed on Screen).

Download.html

<html><body bgcolor="ff99ff"><center><br /> <form action="down"> <h2>FILE DOWNING </h2> <h6>( Image and C source code )</h6> <hr><br /> Image <input type=hidden value="Ganesha.jpg" name="id"> <input type="submit" value="Download" /><br /><br /> </form> <form action="down"> C Code for BFS search <input type=hidden value="bfs.txt" name="id"> <input type="submit" value="Download" /> </form></center></body></html>

web.xml

<web-app><servlet><servlet-name>down</servlet-name><servlet-class>DownloadServlet</servlet-class></servlet><servlet-mapping><servlet-name>down</servlet-name><url-pattern>/down</url-pattern></servlet-mapping></web-app>



DownloadServlet.java

import java.io.*;import javax.servlet.*;import javax.servlet.http.*;

public class DownloadServlet extends HttpServlet{public void service(HttpServletRequest req, HttpServletResponse res) throws IOException,ServletException

{String fileName=req.getParameter("id");String path=null;if(fileName.equals("Ganesha.jpg"))

path="C:\\Ganesha.jpg";else if(fileName.equals("bfs.txt"))

path="C:\\bfs.txt";res.setContentType("application/octet-stream");res.setHeader("Content-Disposition","attachment; filename=\"" + fileName + "\"");OutputStream oStream = res.getOutputStream();FileInputStream file=new FileInputStream(path);int i=0;while((i=file.read())!=-1){oStream.write(i);}file.close();oStream.close();

}}



OUTPUT:



10a. Write a JAVA Servlet Program to implement RequestDispatcher object (use include() and forward() methods).

web.xml

<web-app><servlet><servlet-name>login</servlet-name><servlet-class>LoginServlet</servlet-class></servlet><servlet-mapping><servlet-name>login</servlet-name><url-pattern>/login</url-pattern></servlet-mapping></web-app>

login.jsp

<html><head><title>Login Page</title></head><body bgcolor="#aabbcc"><center><h1>Login Page</h1><h2>Welcome to Java</h2><br><br><br><br><marquee><u>Enter Valid User ID and Password for login</u></marquee><h2><%Object o=session.getAttribute("MSG");if(o!=null){String msg=o.toString();out.println(msg);}%></h2><form action="login" method="post"><table border="2"><tr><td>User ID</td><td><input type="text" name="uname"/></td></tr><tr><td>Password</td><td><input type="password" name="pword"/></td></tr><tr><td colspan="2" align="center" ><input type="submit" value="Login"/></td></tr></table></form></center></body></html>



LoginServlet.jsp

<html><head></head><body><%<%@import java.io.*;%><%@import javax.servlet.*;%><%@import javax.servlet.http.*;%>public class LoginServlet extends HttpServlet{ public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException,ServletException { String un = req.getParameter("uname"); String pw = req.getParameter("pword");System.out.println("User id =" +un);System.out.println("Password =" +pw);RequestDispatcher rd = null;HttpSession ses= req.getSession();if(un.equals("java") && pw.equals("lab10a")){ses.setAttribute("UN",un);rd = req.getRequestDispatcher("/lab10a/register.jsp");rd.forward(req,res);}else{String msg ="in valid user id and password";ses.setAttribute("MSG",msg);rd = req.getRequestDispatcher("/lab10a/login.jsp");rd.include(req,res);}}}%></body></html>

register.jsp

<html><head><title>Login Page</title></head><body bgcolor="#aabbcc"><center><h1>Login Page</h1><h2>Welcome to Java</h2><br><br><br><br><marquee><u>THIS IS doPost() METHOD EXAMPLE</u></marquee><br><br>

<h2><font color="red">



<%Object o=session.getAttribute("UN");if(o!=null){String un=o.toString();//out.println(un);}%>

<h1>WELCOME TO MY PROJECT--------</h1><br><br><br></font></h2></center></body></html>

LoginServlet.java

//package com;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class LoginServlet extends HttpServlet{ public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException,ServletException { String un = req.getParameter("uname"); String pw = req.getParameter("pword");System.out.println("user id is=" +un);System.out.println("user password is =" +pw);RequestDispatcher rd = null;HttpSession ses= req.getSession();if(un.equals("java")&& pw.equals("lab10a")){ses.setAttribute("UN",un);rd = req.getRequestDispatcher("/register.jsp");rd.forward(req,res);}else{String msg ="Invalid user id and password";ses.setAttribute("MSG",msg);rd = req.getRequestDispatcher("/login.jsp");rd.include(req,res);}}}



OUTPUT:



10b. Write a JAVA Servlet Program to implement and demonstrate Get() and Post() methods(Using HTTP Servlet Class).

web.xml

<web-app> <servlet> <servlet-name>login</servlet-name> <servlet-class>LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>login</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> </web-app>

login.jsp

<html><head></head><body bgcolor="#aabbcc"><center><H1>Login Page</H1><H2><u>Welcome to Java</u></H2><br><br><br><br><marquee>This site is hundred persent safe</marquee><h2><font color="red"><%Object o = session.getAttribute("MSG");if(o!=null){String msg= o.toString();out.println(msg);}%></font></h2><form action ="login" method="get"><table border="2" ><tr><td>User name</td><td><input type="text" name="uname"/></tr><tr><td>Password</td><td><input type="password" name="pword"/></tr><tr><td colspan="2" align="center"><input type="submit" value="Login"/></td></tr></table></form></center></body></html>



register.jsp

<html><head></head><body bgcolor="#aabbcc"><center><H1>Login Page</H1><hr><br><br><br><br><h2><marquee><u>WELCOME</u></marquee></h2><br><br><br><h2><font color="red"><%Object o = session.getAttribute("UN");if(o!=null){String un= o.toString();//out.println(un);}%>Your are an Authorized User.............<br><br><br><br></font></h2></form><br><br><br><br><marquee behaviour ="slide" direction="right" width="1000" bgcolor="pink"><h4>YOU ARE WELCOME TO THIS PAGE</h4></marquee></center></body></html>



LoginServlet.java


public class LoginServlet extends HttpServlet{ public void doGet(HttpServletRequest req,HttpServletResponse res)throws IOException,ServletException { String un = req.getParameter("uname"); String pw = req.getParameter("pword");

System.out.println("User id is====="+un); System.out.println("Password is====="+pw);

RequestDispatcher rd = null; HttpSession ses = req.getSession();

if(un.equals("java")&&pw.equals("lab10b")) { ses.setAttribute("UN",un); rd = req.getRequestDispatcher("/register.jsp"); rd.forward(req,res); }

else { String msg="Invalied user id and password"; ses.setAttribute("MSG",msg); rd=req.getRequestDispatcher("/login.jsp"); rd.forward(req,res); } }}



OUTPUT:



11. Write a JAVA Servlet Program to implement sendRedirect() method(using HTTP Servlet Class).

lab11.html

<html><head><title>New Page 1</title></head><body bacgroundColor="cyay"><center><h1>USER NAME AND PASSWORD </h1><h6>( Accept and Display the Name and Password )</h6><hr><br /><form method="POST" action="http://localhost:8090/servlet/SendRedirectServlet"> <p>User Name:<input type="text" name="username" size="20"></p> <p>Password: <input type="password" name="pasword" size="20"></p> <input type="submit" value="Submit" name="B1"></p></form></body></html>

SendRedirectServlet.java


public class SendRedirectServlet extends HttpServlet{protected void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {response.setContentType("text/html");PrintWriter pw = response.getWriter();String name = request.getParameter("username");String pasword = request.getParameter("pasword");if(name.equals("Girish") && pasword.equals("java")){

response.sendRedirect("http://localhost:8090/servlet/ValidUserServlet");}else{

pw.println("You are not a Valid User"); }

} }



ValidUserServlet.java


public class ValidUserServlet extends HttpServlet{protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

PrintWriter pw = response.getWriter();pw.println("<html><head><title>Home Page</title></head>");pw.println("<body");pw.println("<h1><center> HOME PAGE </center></h1><hr><br />");pw.println("<center>Welcome to the world of servlet <certer><br />");pw.println("<center>How are you!</center>");pw.println("</body>");

} }



OUTPUT:



12. Write a JAVA Servlet Program to implement sessions (Using HTTP Session Interface).

ShowSession.java

import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.net.*;import java.util.*;

public class ShowSession extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(true); response.setContentType("text/html"); PrintWriter out = response.getWriter(); String title = "Searching the Web"; String heading; Integer accessCount = new Integer(0);; if (session.isNew()) { heading = "Welcome, Newcomer"; } else { heading = "Welcome Back"; Integer oldAccessCount = // Use getAttribute, not getValue, in version // 2.2 of servlet API. (Integer)session.getValue("accessCount"); if (oldAccessCount != null) { accessCount = new Integer(oldAccessCount.intValue() + 1); } } // Use putAttribute in version 2.2 of servlet API. session.putValue("accessCount", accessCount);

out.println("<BODY BGCOLOR=\"#FDF5E6\">\n" + "<H1 ALIGN=\"CENTER\">" + heading + "</H1><HR>\n" + "<H2>Information on Your Session:</H2>\n" + "<TABLE BORDER=1 ALIGN=CENTER>\n" + "<TR BGCOLOR=\"#FFAD00\">\n" + " <TH>Info Type<TH>Value\n" + "<TR>\n" + " <TD>ID\n" + " <TD>" + session.getId() + "\n" + "<TR>\n" + " <TD>Creation Time\n" + " <TD>" + new Date(session.getCreationTime()) + "\n" + "<TR>\n" + " <TD>Time of Last Access\n" + " <TD>" + new Date(session.getLastAccessedTime()) + "\n" + "<TR>\n" +



" <TD>Number of Previous Accesses\n" + " <TD>" + accessCount + "\n" + "</TABLE>\n" + "</BODY></HTML>");

}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}



OUTPUT:



13a. Write a JAVA JSP Program to print 10 even and 10 odd number.

OddEven.jsp

<html><head><title>Odd Even</title></head><body bgcolor="#DDAAEE"><center><h2><b><u>Ten Odd and Ten Even numbers</u></b></h2><table border="1" aling="center" bgcolor="#FFEEAA" cellpadding=6 cellspacing=6><th>Odd No.</th><th>Even No.</th>

<%! int i; int d; %>

<%for(i=1;i<=100;i++){

d = i%2;if(d!=0){

%>

<tr align="center"><td><%= i%></td>

<%}else{%><td><%= i%></td></tr><%}

} // End of loop %></table></center></body></html>



OUTPUT:



13b. Write a JAVA JSP Program to implement verification of a particular user login and display a welcome page.

login.jsp

<html><head><title>Login Page </title></head><body bgcolor="#aabbcc"><center><H1>Login Page</H1> <marquee>This page is to check the user Authentication</marquee> <form action ="registration.jsp" method="post"><table border="1" ><tr><td>User name</td><td><input type="text" name="uname"/></tr>

<tr><td>Password</td><td><input type="password" name="pword"/></tr>

<tr><td colspan="2" align="center"><input type="submit" value="Login"/></td></tr></table></form></center></body></html>

registration.jsp

<html><head><title>Register</title></head><body><center><br><h1>Registration success page</h1>

<%String un = request.getParameter("uname");String pw=request.getParameter("pword");

if(un.equals("Java")&& pw.equals("lab13b")){ out.println("<hr>");

out.println("<h3>"+un+" : Welcome to JSP</h3>");



}else{ out.println("<hr>"); out.println("You are not Valid user");}%></center></body></html>

register.jsp

<html><head><title>Register</title></head><body bgcolor="FFEEAA"><center><h1>Registration success page</h1>

<%String un = request.getParameter("uname");String pw=request.getParameter("pword");

System.out.println(un);System.out.println(pw);%>

<h1>Hi, <%= un%> Your password is <%= pw%></h1>

</center></body></html>



OUTPUT:



14. Write a JAVA JSP Program to get student information through a HTML and create a JAVA Bean Class, populate Bean and display the same information through another JSP.

StudInfo.html

<html> <head><title> Student Information </title></head> <body>

<form action ="first.jsp" method = "post"> <center> <h1>STUDENT INFORMATION</h1> <h6>( Enter Student Information ) </h6><hr><br />

USN : <input type = "text" name = "usn" /><br /> Name : <input type = "text" name = "sname" /><br /> Marks : <input type = "text" name = "marks" /><br /><br /> <input type ="submit" value ="DISPLAY" /> </center> </form> </body></html>

first.jsp

<html><body><jsp:useBean id="stud" scope="request" class="beans.Student"/><jsp:setProperty name="stud" property="*"/><jsp:forward page="display.jsp"/></body></html>

display.jsp

<html><body><center><h1>STUDENT INFORMATION </h1><h6>( Accepted Information ) </h6><hr><br><jsp:useBean id="stud" scope="request" class="beans.Student"/>Name : <jsp:getProperty name="stud" property="sname"/><br>USN : <jsp:getProperty name="stud" property="usn"/><br>Marks : <%out.print(stud.getmarks());%></center></body></html>



Student.java

package beans;public class Student{public String sname;public int usn;public double marks;

public void setsname(String s){sname = s;}public String getsname(){return sname;}

public void setusn(int sn){usn=sn;}public int getusn(){return usn;}

public void setmarks(double smar){marks = smar;}public double getmarks(){return marks;}}



OUTPUT:


4th sem java record 2009

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