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java tutorial

Copying Files using Java Code

August 9, 2015 by ProjectsGeek Leave a Comment

Copying Files using Java Code

 

In this Copying Files using Java application we will learn how to copy file using java code. I have used swings for creating a sample application which has progress bar to tell the progress of copying process. We are using simple java input stream and output stream to copy the file from one location to other location. You have to specify source location which is the file that user is copying. Then he/she has to specify destination location for the copied file, if both the locations are valid file will be copied.

Steps for copying File

  • Enter source location.
  • Enter Destination location.
  • Click the button. If both the locations are valid file will be copied.

Snapshot for File copy Application

Copy File application

copying progress bar
copy file using java code

Source Code for Copy File Application

MainWindow.java

package com.projectsgeek;

import com.projectsgeek.copy.CopyThread;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 *
 * @author Projectsgeek.com
 */
public class MainWindow extends javax.swing.JFrame implements ActionListener{

    /**
     * Creates new form MainWindow
     */
    public MainWindow() {
        initComponents();
        // Registering the action listner for button
        jButton1.addActionListener(this);
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jProgressBar1 = new javax.swing.JProgressBar();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Copy File Application");
        setPreferredSize(new java.awt.Dimension(500, 200));

        jLabel1.setText("Source File");

        jLabel2.setText("Destination File");

        jButton1.setText("Copy");

        jProgressBar1.setStringPainted(true);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(206, 206, 206)
                .addComponent(jButton1)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(28, 28, 28)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jProgressBar1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 67, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 157, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 119, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 95, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 165, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addGap(31, 31, 31))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jLabel2))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(27, 27, 27)
                .addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 44, Short.MAX_VALUE)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see https://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainWindow().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JProgressBar jProgressBar1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    // End of variables declaration                   

    // Catching the action event and the peforming the Task. This method will get executed when button is clicked.
     @Override
    public void actionPerformed(ActionEvent e) {
        
        // Creating a runnable for the task
        CopyThread copythread = new CopyThread();
        // Setting the source file
        copythread.setSourceFile(jTextField1.getText());
        // Setting the destination File
        copythread.setDestinationFile(jTextField2.getText());
        // Setting the progress bar instance in runnable class
        copythread.setjProgressBar1(jProgressBar1);
        // Passing the runnable to thread
        Thread thread = new Thread(copythread);
        // Starting the thread
        thread.start();
    }

}

CopyThread.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.projectsgeek.copy;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.swing.JProgressBar;

/**
 *
 * @author Projectsgeek.com
 */
public class CopyThread implements Runnable{
    
    private String sourceFile;
    private String destinationFile;
    private javax.swing.JProgressBar jProgressBar1;
    
    // Setters and getters for sourceFile, destinationFile and progressbar
    public JProgressBar getjProgressBar1() {
        return jProgressBar1;
    }

    public void setjProgressBar1(JProgressBar jProgressBar1) {
        this.jProgressBar1 = jProgressBar1;
    }
    
    public String getSourceFile() {
        return sourceFile;
    }

    public String getDestinationFile() {
        return destinationFile;
    }

    public void setSourceFile(String sourceFile) {
        this.sourceFile = sourceFile;
    }

    public void setDestinationFile(String destinationFile) {
        this.destinationFile = destinationFile;
    }

    // This is the run method which will do the real task of copying the file as well as updating the progress bar based on the current status 
    @Override
    public void run() {
        
        // Creating the input stream to read the file
        InputStream inputStream = null;
        // Creating the output stream to write the file
	OutputStream outputStream = null;
		
    	try{
    		
            // creating an instance of source file 
    	    File sourcefile =new File(sourceFile);
            // creating an instance of destination file
    	    File destinationfile =new File(destinationFile);
    	
            // Now reading the file and loading it in inputstream
    	    inputStream = new FileInputStream(sourcefile);
            // Now pointing output stream to the destination file
    	    outputStream = new FileOutputStream(destinationfile);
        	
    	    byte[] buffer = new byte[1024];
            // Taking the length of source file for updating progress bar
            long size = sourcefile.length();
            long count=0;
    		
    	    int length;
    	    // Now we will start byte by byte to read the inputstream and passing it to outputstream 
    	    while ((length = inputStream.read(buffer)) > 0){
    	    	outputStream.write(buffer, 0, length);
                count+=length;
                // Updating the progress bar in percentage
                jProgressBar1.setValue((int) (count*100/size));
                jProgressBar1.setString((int) (count*100/size)+"%");
    	    }
            // Now copied succesfully updating progress bar
            jProgressBar1.setValue(100);
            jProgressBar1.setString("Copied Successfully");
            
            // Closing input as well as outputstream
    	    inputStream.close();
    	    outputStream.close();
    	    
    	}catch(IOException e){
    		e.printStackTrace();
    	}
    }
    
}

Download Copying Files using Java Code

Download Source Code

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Filed Under: Java Tutorials Tagged With: java tutorial

Creating a PDF file using Java code

August 2, 2015 by ProjectsGeek Leave a Comment

Creating a PDF file using Java code

 

We will use the iText API for creating a pdf file using java code. Its a open source java API for creating pdf files, But if you are planning to use this iText API for commercial purpose you need to buy a licence for it. You can download this iText API from below link.

Download iText API

You can create pdf documents, XML files, HTML as well as RTF documents using this API. Lots of customization are there in this iText API which allows users create paragraphs, applying different fonts, adding images to pdf files, adding watermarks to pdf documents etc.

Steps to be followed for creating a PDF Document

  • Create a document using com.itextpdf.text.Document class of iText API.
  • Now create a PdfWriter using com.itextpdf.text.pdf.PdfWriter.
  • Open the document and start writing text to it.
  • After writing content to it, close the document as well as writer.

Below is the Snapshots for Application using Java swings:

create a pdf using java

Here user will enter the details on the UI form of member application. We have one button also which will be used to create pdf file in the location we have provided.

create a pdf file

In this snapshots you can see the user has entered all the details. [Note] We are considering date field as the string only.


 

Now moving on to source code of this small application:

 

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.projectsgeek;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

/**
 *
 * @author Projectsgeek
 */
public class MainWindow extends javax.swing.JFrame implements ActionListener{

    /**
     * Creates new form MainWindow
     */
    public MainWindow() {
        initComponents();
        this.setTitle("Create a PDF File Demo");
        jButton1.addActionListener(this);
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        jTextField2 = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();
        jTextField3 = new javax.swing.JTextField();
        jLabel5 = new javax.swing.JLabel();
        jTextField4 = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
        jTextField5 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setPreferredSize(new java.awt.Dimension(500, 500));

        jLabel1.setText("Name");

        jLabel2.setText("Create a PDF Application");

        jLabel3.setText("Gender");

        jLabel4.setText("Date of Birth");

        jLabel5.setText("Fathers Name");

        jLabel6.setText("Address");

        jButton1.setText("Create a PDF File");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel3)
                            .addComponent(jLabel5)
                            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(99, 99, 99)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 140, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                .addComponent(jTextField2, javax.swing.GroupLayout.DEFAULT_SIZE, 140, Short.MAX_VALUE)
                                .addComponent(jTextField3)
                                .addComponent(jTextField4)
                                .addComponent(jTextField5)))
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGap(0, 250, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(jButton1)
                                .addGap(187, 187, 187))
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 163, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(162, 162, 162))))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel2)
                .addGap(41, 41, 41)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(24, 24, 24)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel6)
                    .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 49, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(42, 42, 42))
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see https://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainWindow().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    private javax.swing.JTextField jTextField5;
    // End of variables declaration                   

    @Override
    public void actionPerformed(ActionEvent e) {
        
      Document document = new Document();
      try
      {
         PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("d://MemberDetails.pdf"));
         document.open();
         document.add(new Paragraph("This is registration Page"));
         document.add(new Paragraph("Member Name:"+this.jTextField1.getText()));
         document.add(new Paragraph("Member Gender:"+this.jTextField2.getText()));
         document.add(new Paragraph("Member DOB:"+this.jTextField3.getText()));
         document.add(new Paragraph("Member Fathers:"+this.jTextField4.getText()));
         document.add(new Paragraph("Member Address:"+this.jTextField5.getText()));
         document.close();
         writer.close();
      } catch (DocumentException e2)
      {
         e2.printStackTrace();
      } catch (FileNotFoundException e1)
      {
         e1.printStackTrace();
      }
        
    }
}

Download the Source Code
Creating a PDF file using Java Code

Other Projects to Try:

  1. Copying Files using Java Code
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Filed Under: Java Assignments, Java Tutorials Tagged With: java tutorial

Java Tutorial for beginners – Introduction to Java

December 23, 2013 by ProjectsGeek Leave a Comment

Introduction to Java

 

Java Tutorial for beginners tutorial is basically for beginners which have very less or no experience in java programming. This Java Tutorial for beginners tutorial will show you what is java programming from the very basic.

How to use this Tutorial ?

  • Go through the presentation given below and read every concept given in the presentation.
  • Practice each given examples  in the presentation.
  • Try to answer the questions given at the end of each  presentation.

Contents of Java Tutorial for beginners – Introduction to Java

  • History of Java
  • What is JDK
  • What is bytecode?
  • Object oriented language
  • Object oriented language Advantages
  • Java Programs
  • Developing a Java Program
  • Features of Java
  • Sample program
  • Question and answers

Download Java Tutorial for beginners

Introduction to Java – Part 1

 [gview file=”https://sites.google.com/site/projectsgeek2/studymaterialjava/Introduction%20to%20Java-Basic%20Java%20tutorial.ppt” profile=”3″ save=”1″]

Question for Introduction to Java – Part 1

What are the advantages of Java ?

  • Syntax based on C++
  • Object-oriented
  • Support for Internet applications
  • Extensive library of prewritten classes
  • Portability among platforms
  • Built-in networking
  • Security as JRE is inaccessible to other parts of computer.

 

What is the difference between an interpreter and a compiler ?

Java Compiler generates byte code instead of machine code and interpreter executes java program

Define Class and Object ?

Class

  • tool for encapsulating data and operations (methods) into one package
  • defines a template or model for creating and manipulating objects

Objects

  • data created using the class and its methods
  • an object is an instance of the class
  • creating an object is instantiation

 What are different Java programs ?

Applets

Small programs designed to add interactivity to Web sites

Downloaded with the Web page and launched by the Internet browser

Servlets

Run by Web server on the server

Typically generate Web content

Applications

Programs that run standalone on a client

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Filed Under: Java Tutorials Tagged With: java tutorial

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