CBT lab

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Program

FileInterface.java

import java.rmi.Remote;

import java.rmi.RemoteException;

public interface FileInterface extends Remote {

public byte[] downloadFile(String fileName) throws

RemoteException;

}

FileImpl.java

import java.io.*;

import java.rmi.*;

import java.rmi.server.UnicastRemoteObject;

public class FileImpl extends UnicastRemoteObject

implements FileInterface {

private String name;

public FileImpl(String s) throws RemoteException{

super();

name = s;

}

public byte[] downloadFile(String fileName){

try {

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File file = new File(fileName);

byte buffer[] = new byte[(int)file.length()];

BufferedInputStream input = new

BufferedInputStream(new FileInputStream(fileName));

input.read(buffer,0,buffer.length);

input.close();

return(buffer);

} catch(Exception e){

System.out.println("FileImpl: "+e.getMessage());

e.printStackTrace();

return(null);

}

}

}

FileServer.java

import java.io.*;

import java.rmi.*;

public class FileServer {

public static void main(String argv[]) {

try {

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FileInterface fi = new FileImpl("FileServer");

Naming.rebind("//127.0.0.1/FileServer", fi);

} catch(Exception e) {

System.out.println("FileServer: "+e.getMessage());


}

}

}

FileClient.java

import java.io.*;

import java.rmi.*;

public class FileClient{

public static void main(String argv[]) {

if(argv.length != 2) {

System.out.println("Usage: java FileClient fileName

machineName");

System.exit(0);

}

try {

String name = "//" + argv[1] + "/FileServer";

FileInterface fi = (FileInterface) Naming.lookup(name);

byte[] filedata = fi.downloadFile(argv[0]);

System.out.println(enter the file to download);

BufferedReader br = new BufferedReader(new

InputStreamReader(system.in));

String newname = br.readLine();

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File file = new File(newname);

BufferedOutputStream output = new

BufferedOutputStream(new FileOutputStream(file.getName()));

output.write(filedata,0,filedata.length);

output.flush();

output.close();

} catch(Exception e) {

System.err.println("FileServer exception: "+ e.getMessage());


}

}

}

Execution

Server folder [interface.java,fileimpl.java,file server.java]

1. Compile all the java program using (javac filename.java)

2. enter the (start rmiregistry) in command line

3. create stub and skeleton using (rmic FileImpl)

4.create one file i.e a.txt in server folder

5. Run the server using (java FileServer)

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Client folder[file interface.java,fileclient.java,copy the stub and

skeleton from server folder and paste it in client folder]

1. Compile all the java program using (javac filename.java)

(The next contains two parameters First is the text file created

by the user second is machine IP Address)

2. Run the Client using (java FileClient a.txt 192.168.0.154)

7. next step you will give the file name to download the file (Enterthe file name to download : b.txt)

1.a.txt and b.txt contains the same content.

OUTPUT:-

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JText Field

import java.awt.*;

import javax.swing.*;

/*

*/

public class JTextFieldDemo extends JApplet {

JTextField jtf;

public void init() {

// Get content pane

Container contentPane = getContentPane();

contentPane.setLayout(new FlowLayout());

// Add text field to content pane

jtf = new JTextField(15);

contentPane.add(jtf);

}

}

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2

JBUTTON

import java.awt.*;

import java.awt.event.*;


/*

*/

public class JButtonDemo extends JApplet

implements ActionListener {

JTextField jtf;


// Get content pane



// Add buttons to content pane

ImageIcon france = new ImageIcon("france.gif");

JButton jb = new JButton(france);

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jb.setActionCommand("France");

jb.addActionListener(this);

contentPane.add(jb);

ImageIcon germany = new ImageIcon("germany.gif");

jb = new JButton(germany);

jb.setActionCommand("Germany");



ImageIcon italy = new ImageIcon("italy.gif");

jb = new JButton(italy);

jb.setActionCommand("Italy");



ImageIcon japan = new ImageIcon("japan.gif");

jb = new JButton(japan);

jb.setActionCommand("Japan");



// Add text field to content pane



}

public void actionPerformed(ActionEvent ae) {

jtf.setText(ae.getActionCommand());

}

}

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3

JCheck Boxes

import java.awt.*;



/*

*/

public class JCheckBoxDemo extends JApplet

implements ItemListener {

JTextField jtf;


// Get content pane



// Create icons

ImageIcon normal = new ImageIcon("normal.gif");

ImageIcon rollover = new ImageIcon("rollover.gif");

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ImageIcon selected = new ImageIcon("selected.gif");

// Add check boxes to the content pane

JCheckBox cb = new JCheckBox("C", normal);

cb.setRolloverIcon(rollover);

cb.setSelectedIcon(selected);

cb.addItemListener(this);

contentPane.add(cb);

cb = new JCheckBox("C++", normal);





cb = new JCheckBox("Java", normal);





cb = new JCheckBox("Perl", normal);





// Add text field to the content pane



}

public void itemStateChanged(ItemEvent ie) {

JCheckBox cb = (JCheckBox)ie.getItem();

jtf.setText(cb.getText());

}

}

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4

JRadio Button

import java.awt.*;



/*

*/

public class JRadioButtonDemo extends JApplet

implements ActionListener {

JTextField tf;


// Get content pane



// Add radio buttons to content pane

JRadioButton b1 = new JRadioButton("A");

b1.addActionListener(this);

contentPane.add(b1);

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JRadioButton b2 = new JRadioButton("B");



JRadioButton b3 = new JRadioButton("C");



// Define a button group

ButtonGroup bg = new ButtonGroup();

bg.add(b1);

bg.add(b2);

bg.add(b3);

// Create a text field and add it

// to the content pane

tf = new JTextField(5);

contentPane.add(tf);

}

public void actionPerformed(ActionEvent ae) {

tf.setText(ae.getActionCommand());

}

}

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5

JCOMBO BOX

import java.awt.*;



/*

*/

public class JComboBoxDemo extends JApplet

implements ItemListener {

JLabel jl;

ImageIcon france, germany, italy, japan;


// Get content pane



// Create a combo box and add it

// to the panel

JComboBox jc = new JComboBox();

jc.addItem("France");

jc.addItem("Germany");

jc.addItem("Italy");

jc.addItem("Japan");

jc.addItemListener(this);

contentPane.add(jc);

// Create label

jl = new JLabel(new ImageIcon("france.gif"));

contentPane.add(jl);

}

public void itemStateChanged(ItemEvent ie) {

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String s = (String)ie.getItem();

jl.setIcon(new ImageIcon(s + ".gif"));

}

}

6

JTREE

import java.awt.*;



import javax.swing.tree.*;

/*

*/

public class JTreeEvents extends JApplet {

JTree tree;

JTextField jtf;


// Get content pane

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// Set layout manager

contentPane.setLayout(new BorderLayout());

// Create top node of tree

DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");

// Create subtree of "A"

DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");

top.add(a);

DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");

a.add(a1);

DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");

a.add(a2);

// Create subtree of "B"

DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");

top.add(b);

DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");

b.add(b1);


b.add(b2);


b.add(b3);

// Create tree

tree = new JTree(top);

// Add tree to a scroll pane

int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;

int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;

JScrollPane jsp = new JScrollPane(tree, v, h);

// Add scroll pane to the content pane

contentPane.add(jsp, BorderLayout.CENTER);

// Add text field to applet

jtf = new JTextField("", 20);

contentPane.add(jtf, BorderLayout.SOUTH);

// Anonymous inner class to handle mouse clicks

tree.addMouseListener(new MouseAdapter() {

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public void mouseClicked(MouseEvent me) {

doMouseClicked(me);

}

});

}

void doMouseClicked(MouseEvent me) {

TreePath tp = tree.getPathForLocation(me.getX(), me.getY());

if(tp != null)

jtf.setText(tp.toString());

else

jtf.setText("");

}

}

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ServletFormhandling:-

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class FormHandlerServlet extends HttpServlet

{

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse response)

{

String enteredValue;

// gets all the selected options from the client browser

String[] selectedOptions = request.getParameterValues("options");

// gets the enteredValue fields value

enteredValue = request.getParameter("enteredValue");

response.setContentType("text/html");

PrintWriter printWriter;

try

{

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// get a printwriter from the HttpServletResponse objects ref.

printWriter = response.getWriter();

// return on the HttpServletResponse objects ref. requested values

printWriter.println("

");

printWriter.print("You entered: ");

printWriter.print(enteredValue);

printWriter.print("
");

");

printWriter.print("The following options were selected:");

");

if (selectedOptions != null)

{

for (String option : selectedOptions)

{

printWriter.print(option);

");

}

}

else

{

printWriter.println("None");

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}

");
}

catch (IOException e)

{


}

}

}

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Login.html

Login

Login

Please enter your username and password

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GetSession.java

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

public class GetSession extends HttpServlet {

@Override

public void doGet(HttpServletRequest request, HttpServletResponse response) {

// gets the session if it exists

HttpSession session = request.getSession(false);

try {


PrintWriter writer = response.getWriter();

writer.println("");

// If you are not in a session - you are not logged in

if (session == null) {

writer.println("

You are not logged in
");
} else {

writer.println("Thank you, you are already logged in");

writer.println("Here is the data in your session");

Enumeration names = session.getAttributeNames();

while (names.hasMoreElements()) {

String name = (String) names.nextElement();

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Object value = session.getAttribute(name);

writer.println("

name=" + name + " value=" + value + "
");
}

}

// Write html for a new login

writer.println("

Return" +

" to login page
");
writer.println("");

writer.close();

} catch (Exception e) {


}

}

}

LoginSES.java

import javax.servlet.http.*;

import java.io.*;

public class LoginSES extends HttpServlet {

@Override

public void doPost(HttpServletRequest request,

HttpServletResponse response)

{

String username = request.getParameter("username");

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String password = request.getParameter("password");

// Get the session - if no session exists create one

HttpSession session = request.getSession(true);

// Set some attribute values to the session

// In this case user and password from the request and client

session.setAttribute("username", username);

session.setAttribute("password", password);

try {


PrintWriter writer = response.getWriter();

writer.println("");

writer.println("Thank you, " + username +

". You are now logged into the system");

// Encodes the specified URL by including the session ID in it,

// or, if encoding is not needed, returns the URL unchanged

String newURL = response.encodeURL("/ServletSession/GetSession");

// Return a tag with the new url

writer.println("Click here for another servlet");

writer.println("");

writer.close();

} catch (Exception e) {


}

}

}

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CBT lab

Documents

Transcript of CBT lab