Random password generation using java swing

  

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java program to rotate image

package imaging;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

/**
 *
 * @author Aravind Sankaran
 */
public class RotateImage {
    public  static void main(String args[]){
        try {    
        String path="C:\\images\\ppp.jpg";
        File fileInput=new File(path);
        BufferedImage  img = ImageIO.read(new File(path)); // try/catch IOException
        int width = img.getWidth();
        int height = img.getHeight();        
        String fileName=fileInput.getName();
        fileName=fileName.substring(0, fileName.lastIndexOf('.'));
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = bufferedImage.createGraphics();
      
// draw graphics     
        double angle=45.0;     
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.rotate(Math.toRadians(angle), width, width);
        g2d.drawImage(img, 0, 0, null);        
        g2d.dispose();
//save as png
File file = new File("C:\\images\\"+fileName+".png");
ImageIO.write(bufferedImage, "png", file);
     } catch (IOException ex) {
      
     }

    }
}
input:

output:

Adding text to Image (java swing application)

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Analog clock using java swing

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package analogclock;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.TimerTask;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 *
 * @author Aravind Sankaran
 */
public class AnalogClock  extends JPanel{
  
ImageIcon img;

private GregorianCalendar m_calendar;
private int[] x=new int[2];
private int[] y=new int[2];
private java.util.Timer clocktimer=new java.util.Timer();

/**You could set the TimeZone for the clock here. I used the Dfault time
zone from the user so that every time the program runs on different
computers the correct time is displayed*/

private TimeZone clockTimeZone=TimeZone.getDefault();

//Constructor
public AnalogClock()
{
this.setPreferredSize(new Dimension(210,210));
this.setMinimumSize(new Dimension(210,210));

//schedules the clocktimer task to scan for every 1000ms=1sec
clocktimer.schedule(new TickTimerTask(),0,1000);
}
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setSize(300, 400);
frame.setTitle("Analog Clock");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

AnalogClock m_AnalogClock=new AnalogClock();
frame.add(m_AnalogClock);
frame.setVisible(true);
   
}
//The Clock Face instance method
public void paint(Graphics g)
{

g.setColor(Color.WHITE);
g.fillRect(0,0,this.getWidth(),this.getHeight());
drawCardinals((Graphics2D)g);
drawHands((Graphics2D)g);

}

//Endpoints of the Clock Hand
void clockMinutes(int startRadius,int endRadius,double theta)
{
theta-=Math.PI/2;
x[0]=(int)(getWidth()/2+startRadius*Math.cos(theta));
y[0]=(int)(getHeight()/2+startRadius*Math.sin(theta));
x[1]=(int)(getWidth()/2+endRadius*Math.cos(theta));
y[1]=(int)(getHeight()/2+endRadius*Math.sin(theta));
}

//The Hours/Cardinals of the clock
/** Set Stroke sets the thickness of the cardinals and hands*/
void drawCardinals(Graphics2D g)
{
//g.setStroke(new BasicStroke(9));
g.setStroke(new BasicStroke(12));
g.setColor(Color.black);

for(double theta=0;theta<Math.PI*2;theta+=Math.PI/6)
{
clockMinutes(100,100,theta);
/**Draws a sequence of connected lines defined by arrays of x and
*y coordinates. Each pair of (x, y) coordinates defines a point.
*The figure is not closed if the first point
differs from the last point.*/
g.drawPolyline(x,y,2);
}
}

//The Hand of the Clocks instance method
public void drawHands(Graphics2D g)
{
double h=2*Math.PI*(m_calendar.get(Calendar.HOUR));
double m=2*Math.PI*(m_calendar.get(Calendar.MINUTE));
double s=2*Math.PI*(m_calendar.get(Calendar.SECOND));

g.setStroke(new BasicStroke(9));

clockMinutes(0,55,h/12+m/(60*12));
g.setColor(Color.BLACK);
g.drawPolyline(x,y,2);

clockMinutes(0,70,m/60+s/(60*60));
g.setColor(Color.black);
g.drawPolyline(x,y,2);

clockMinutes(0,70,s/60);
g.setColor(Color.red);
g.drawPolyline(x,y,2);

g.fillOval(getWidth()/2-8,getHeight()/2-8,16,16);
}



//method to update/refresh the clock every second
class TickTimerTask extends TimerTask
{
public void run()
{
m_calendar=(GregorianCalendar)GregorianCalendar.getInstance(clockTimeZone);
repaint();
}
}
}
   

output:

Checking User Name Availability Using AJAX, JSP And MySQL and javascript

 userregistration.jsp
<%--
    Document   : userregistration
    Created on : 17 May, 2013, 11:22:42 AM
    Author     : Aravind Sankaran
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
        <script type="text/javascript">
          function validateForm()
            { 
            var x=document.forms["login"]["username"].value;
            var y=document.getElementById('actual').value;           
           
                if (y=="taken")
                {
                       alert("Name already exist in database");
                    return false;
                }else
                {
                        alert("No name exist");
                }
                   
                   
             }
        </script>
        <script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
var k=document.getElementById("username").value;
var urls="checkusername.jsp?ver="+k;

if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4)
    {
        document.getElementById("err").innerHTML=xmlhttp.responseText;
     }
  }
xmlhttp.open("GET",urls,true);
xmlhttp.send();
}
</script>
    </head>
    <body bgcolor="black">
        <form name="login" method="get" action="" onsubmit="return validateForm();">
        <p>
    <center>
        <font color="white">User Name: </font><input type="text" name="username" id="username" onkeyup="loadXMLDoc()"><br>
        <span id="err"> </span>
    </center>
        </p>
        </form>
    </body>
</html>

checkusername.jsp
<%--
    Document   : checkusername
    Created on : 9 May, 2013, 12:42:25 PM
    Author     : Aravind Sankaran
--%>

<%@ page import="java.io.*,java.sql.*" %>
<%@ page contentType="text/html" pageEncoding="UTF-8"%>

<%
                    String sn=request.getParameter("ver");
                    Class.forName("com.mysql.jdbc.Driver");
                    Connection con =DriverManager.getConnection("jdbc:mysql://localhost:3306/daodatabase","root","root");
                    Statement st=con.createStatement();
                    ResultSet rs = st.executeQuery("select * from usertable where username='"+sn+"'");  // this is for name
                    if(rs.next())
                    {   %>
                        <font color=red>
                        Name already taken
                        <input type="hidden" id="actual" name="actual" value="taken">
                        <input type="submit" value="submit">
                        </font>

                   <% }else {%>
                        <font color=green>
                        <input type="hidden" id="actual" name="actual" value="available">
                        Available
                        </font>
                        <input type="submit" value="submit">
                   <% }%>
                   
     <%              
rs.close();
st.close();
con.close();
%>

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>userregistration.jsp</welcome-file>
    </welcome-file-list>
</web-app>

java program to display space count of a given string

public class SpaceCounter{
    static  int spaceCounter=1;
    public static void main(String ar[]){
       
        String input="hello aravind sankaran nair";
       
        for (char space : input.toCharArray()) {
          if(Character.isWhitespace(space)){
           spaceCounter=spaceCounter+1;
          }
         }
        System.out.println("number of words = "+spaceCounter);
    }
}

output:
number of words = 4

Java program to connect MySql using ArrayList

Create database with name "employeedb"
Create table with name "employee"
CREATE TABLE `employee` (
  `empname` varchar(45) NOT NULL,
  `empdesignation` varchar(45) NOT NULL,
  `empsalary` varchar(45) NOT NULL
);

java code:
package mysqlconnectionusingarraylist;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

/**
 *
 * @author Aravind Sankaran Nair
 */
public class MySqlConnectionUsingArrayList {
  
     public static void main(String[] args) {
         ArrayList<Employee> employeeList =new ArrayList<Employee>();
         String url = "jdbc:mysql://localhost:3306/employeedb";
         try{
            Connection conn = DriverManager.getConnection(url, "root", "root");
            Statement st = conn.createStatement();
             ResultSet rs = st.executeQuery("SELECT * FROM employee");
                while(rs.next()){
                Employee employee=new Employee();             
                employee.setEmpName(rs.getString("empname"));
                employee.setEmpDesignation(rs.getString("empdesignation"));
                employee.setEmpSalary(rs.getString("empsalary"));
                employeeList.add(employee);               
                }
                 for(int i=0;i<employeeList.size();i++){
                System.out.println("Employee name is "+employeeList.get(i).getEmpName());
                System.out.println("Employee designation is "+employeeList.get(i).getEmpDesignation());
                System.out.println("Employee salary is "+employeeList.get(i).getEmpSalary());
                System.out.println("");
                }
         }catch(Exception e){
            
         }
          
     }
}
class Employee{
    private String empName;
    private String empDesignation;
    private String empSalary;

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public String getEmpDesignation() {
        return empDesignation;
    }

    public void setEmpDesignation(String empDesignation) {
        this.empDesignation = empDesignation;
    }

    public String getEmpSalary() {
        return empSalary;
    }

    public void setEmpSalary(String empSalary) {
        this.empSalary = empSalary;
    }
   
}

output:
Employee name is aravind
Employee designation is software engineer
Employee salary is 25000

Employee name is ambili
Employee designation is software engineer
Employee salary is 35000

Checking User Name Availability Using AJAX, JSP And MySQL updated version

Project structure:

userregistration.jsp
<%--
    Document   : userregistration
    Created on : 17 May, 2013, 11:22:42 AM
    Author     : Aravind Sankaran
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
        <script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
var k=document.getElementById("username").value;
var urls="checkusername.jsp?ver="+k;

if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4)
    {
        document.getElementById("err").innerHTML=xmlhttp.responseText;
     }
  }
xmlhttp.open("GET",urls,true);
xmlhttp.send();
}
</script>
    </head>
    <body bgcolor="black">
        <p>
    <center>
        <font color="white">User Name: </font><input type="text" name="username" id="username" onkeyup="loadXMLDoc()"><br>
        <span id="err"> </span>
    </center>
        </p>
    </body>
</html>

checkusername.jsp
<%--
    Document   : checkusername
    Created on : 9 May, 2013, 12:42:25 PM
    Author     : Aravind Sankaran
--%>

<%@ page import="java.io.*,java.sql.*" %>
<%@ page contentType="text/html" pageEncoding="UTF-8"%>

<%
                    String sn=request.getParameter("ver");
                    Class.forName("com.mysql.jdbc.Driver");
                    Connection con =DriverManager.getConnection("jdbc:mysql://localhost:3306/daodatabase","root","root");
                    Statement st=con.createStatement();
                    ResultSet rs = st.executeQuery("select * from usertable where username='"+sn+"'");  // this is for name
                    if(rs.next())
                    {   %>
                        <font color=red>
                        Name already taken
                        </font>

                   <% }else {%>
                        <font color=green>
                        Available
                        </font>
                        <input type="submit" value="submit">
                   <% }%>
                   
     <%              
rs.close();
st.close();
con.close();
%>

web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>userregistration.jsp</welcome-file>
    </welcome-file-list>
</web-app>
output: