Python wishes you all " Happy Diwali "

Code:

Click here to download the source code

Output:

A very useful article to restore a pen drive capacity back to full using diskpart

Follow the link:

http://www.datarecovery.institute/restore-usb-drive-capacity/

Patterns with Thread

This is a simple java program in which patterns are displayed character by character with the help of thread.

Code:

public class PatternWithThread extends Thread{

int no = 1;

char ch = 'a';   
    public void run(){
        try{

             for(int i = 1;i <= 5;i ++)
             {
                 for(int j = 1;j <= i;j ++)
                {               
                Thread.sleep(250);
                System.out.print(i);
                }
            System.out.println("");
            }

        System.out.println("");
            

             for(int i = 1;i <= 5;i ++)
            {
                 for(int j = 1;j <= i;j ++)
                {               
                Thread.sleep(250);
                System.out.print("*");
                }
             System.out.println("");
           }

         System.out.println("");
           
            for(int i = 1;i <= 5;i ++)
           {
                for(int j = 0;j < i;j ++)
               {               
               Thread.sleep(250);
               System.out.print((i+j)%2);
               }
           System.out.println("");
           }

         System.out.println("");
           
            for(int i = 1;i <= 5;i ++)
            {
                 for(int j = 1;j <= i;j ++)
                {               
                Thread.sleep(250);
                       if(i%2 != 0)
                      {
                      System.out.print(no);
                      no++;
                      }
                      else
                      {
                      System.out.print(ch);
                      ch++;   
                      }
                }
            System.out.println("");
            }
      }
      catch(Exception e){}   
 }   

 public static void main(String args[])
 {
 PatternWithThread obj = new PatternWithThread();

 obj.start();   
 }

}

Snapshot:

 

Demonstrating Servlet Deployment

Apparatus: 

• XAMPP Server/Apache Tomcat (Servlet Container)
• MS Access
• Web Browser
• Editor (Notepad ++)
• Java Development Kit

Things Covered in this post:

• Writing a java servlet program
• Creating user DSN and using it to connect Java web application to Database (.mdb)
• Deploying the servlet in Servlet Container
• Running the Application in Web Browser

Summary:

Step 1: Writing a basic HTML to construct User Interface (home.html)

Step 2: Creating a Database in MS Access (Database2.mdb)

Step 3: Creating a DSN

Step 4: Writing a Java Servlet Program

Step 5: Compiling the Java Servlet Program

Step 6: Making the entry of the Java Servlet class in the descriptor file (web.xml)

Step 7: Deploying the files in appropriate directories

Step 8: Starting the Apache Tomcat module

Step 9: Checking the services running

Step 10: Running the Web Application on the Web Browser

Steps in Detail:

Step 1: Writing a basic HTML to construct User Interface (home.html): 

Click here to view the code in HTML file 

Step 2: Creating a Database in MS Access (Database2.mdb):

The schema of table ‘result’ in Database2.mdb:

Field Name	Data Type	Field Size
RollNo (Primary Key)	Number	Long Integer
SName	Text	255
Branch	Text	255
CPI	Number	Double

Step 3: Creating a DSN:

Open System & Security/ Administrative Tools from Control Panel. Select ODBC Data Sources (32-bit). Click on User DSN tab and click Add…Button.

Select Driver do Microsoft Access (*.mdb).

 

Give the Data Source Name and click the Select…  button to link the database file. Then click the OK button.

Step 4: Writing a Java Servlet Program:

Click here to view the source code

Step 5: Compiling the Java Servlet Program:

First time compilation of Java Servlet Program would fail because libraries (servlet-api.jar at location C:\xampp\tomcat\lib ) consisting of servlet classes are not present in installed jdk. So you need to set the User variable CLASSPATH in Environment Variables which you will find in Advanced system settings in Control Panel as shown:

User variables:

Variable	Value
CLASSPATH	.;C:\xampp\tomcat\lib\servlet-api.jar

System variables:

Variable	Value
JAVA_HOME	C:\Program Files (x86)\Java\jdk1.6.0_24
Path	C:\Program Files (x86)\Java\jdk1.6.0_24\bin

Restart the computer after setting the variables.

Note: Locations may differ as per the different installation directories.

Step 6: Making the entry of the java servlet class in the descriptor file (web.xml):

 

web.xml is a descriptor file which consists the information of all the servlet classes present in the web application. The URLs to access the servlets are specified in this file.

Step 7: Deploying the files in appropriate directories:

This zip file consists of following files at following locations:

1.       home.html (C:\xampp\tomcat\webapps\student)

2.       Database2.mdb (C:\xampp\tomcat\webapps\student)

3.       web.xml (C:\xampp\tomcat\webapps\student\WEB-INF)

4.       Result.java (C:\xampp\tomcat\webapps\student\WEB-INF\classes)

5.       Result.class (C:\xampp\tomcat\webapps\student\WEB-INF\classes)

You can even directly extract student.rar file to C:\xampp\tomcat\webapps.

Step 8: Starting the Apache Tomcat module:

Start the Apache Tomcat from XAMPP Control Panel.

 

Step 9: Checking the services running:

In order to check whether the Apache Tomcat has started or not, simply type the following URL in your web browser:

localhost:8080

Step 10: Running the Web Application on the Web Browser:

To run this web application, type the following URL:

http://localhost:8080/student/home.html

Note: Every time you make changes to your servlet program, after compilation you need to restart the Apache Tomcat in order to reflect the changes.

 

 

 

 

  

 

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