Shopping cart using Servlets

This is an attempt to create a Shopping cart using Servlet Technology.

Book.html
==
<html>
<head>
<title>Book
</title>
</head>
<body bgcolor="#aa9923">
<form method="post" action="http://localhost:8080/servlet/book">
<select name=s1 Multiple>
<option>Using Java
<option>Servlet Handbook
<option>Core Java
<option>VB Bible
<option>ASP Form
</select>
<input type=submit value="OK">
</form>
</body>
</html>
==
 Book.java
== 
package test;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class book extends HttpServlet
{
 public void doPost(HttpServletRequest req, HttpServletResponse res)throws ServletException,
IOException
 {
res.setContentType("text/html");
PrintWriter out=res.getWriter();
HttpSession session=req.getSession(true);
String str[]=req.getParameterValues("s1");
session.putValue("book.purch", str);
out.println("Thanks for buying");
out.println("Visit our sports shop");
 out.println("<a href=\”sport.html\”>sport shop</a>");
}
out.close();
 }
}
==

<html>
<head>
<title>sports
</title>
</head>
<body bgcolor="#aa9923">
<form method=post action="http://localhost:8080/servlet/sports">
<select name=s1 Multiple>
<option>boll
<option>bat
<option>track and knit
<option>racquet
</select>
<input type=submit value="BUY">
</form>
</body>
</html>
===

package test;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class sport extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException,
ServletException
{

doPost(req,res);
}
public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException,
ServletException
{
PrintWriter out=res.getWriter();
res.setContentType("text/html");
HttpSession session=req.getSession(true);
String str[]=req.getParameterValues("s1");
session.putValue("sport.pur",str);
out.println("thanks for buying.");
out.println("<a href=\"/servlet/bill\">billing</a>");
out.close();
}
}
==

package test;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class bill extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException,
ServletException
{
doPost(req,res);
}
public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException,
ServletException
{
PrintWriter out=res.getWriter();
res.setContentType("text/html");
HttpSession session=req.getSession(true);
out.println("you have bought the following books.<ol>");
String book[]=(String[])session.getValue("book.pur");
String sport[]=(String[])session.getValue("sport.pur");
for(int i=0;i<book.length;i++)
{
out.println("<li>"+book[i]);
}
out.println("</ol><br>you have bought the foll.sport items.they are<ol>");
for(int i=0;i<sport.length;i++)
{
out.println("<li>"+sport[i]);
}
out.println("</ol>");
out.close();
}

Hashing -Data Structure-Hashing in Java

Hashing

Why we need Hashing algorithm and how it differs from other algorithms

The main objective of Data Structure is effective way of organizing data in memory so that search and sort and other operations are fast.

Hashing is a special technique used to store and search data more effectively.

1.Compare with Array

We have 5 records and we want to store them in an effective way and retrieve any one from that collection. I want to search 13

Number iterations 5

Time Complexity O(n) ( n here denotes number of items in the Array)

2.Compare with Linked List

Trying search 13

Number of iterations 5

Time Complexity O(n)

3.Binary Search Tree

Number of iterations:4

Time complexity O(log n)

/*For the input of size n, an algorithm of O(n) will perform steps proportional to n, while another algorithm of O(log(n)) will perform steps roughly log(n).

Clearly log(n) is smaller than n hence algorithm of complexity O(log(n)) is better. Since it will be much faster.

Hash table a specialized array ,here we use special function called Hash function to store and retrieve data in a collection.

But normal array we use index to store in a linear fashion.

Step 1: create a hash table

Step 2: Use a prime number

We have five records(5)

We need a prime number after the 5 that is 7

We need a hash function, it’s a mathematical formula .

A simple one is modulo operation

Search using Hash

We search 15

No of iterations 1 &Time Complexity O(1)

Collision:

Hash table size must be prime number, if we take the size as a non prime number:

Say for example the size is 8

While using prime number as size of Hashtable will also sometimes creates Collision.

To avoid that there are two methods:

1.separate Chaining 2.Open Addressing

In separate chaining we use Linked List when collision occurs:

Hash table size =7

50%7=1 so 50 stored in 1^st index

700%7=0 so 700 goes to 0^th index

76%7=6 so 76 goes to 6^th index

85 %7

Search speed would be not o(1)

Open Addressing:

The main advantage is no linked is used here.A new technique will followed when collision occurs:

a)Linear probing

b)Quadratic Probing

c)Double Hashing

Linear probing is scheme in computer programming for resolving collisions in a hashtable data structures for maintaining a collection of key-value pairs and looking up a value associated with a given key.

Quadratic probing operates by taking the original hash index and adding successive values of an arbitrary quadratic polynomial until an open slot is found.

Double hashing a technique used in conjunction with open addressing in hash tables to resolve hash collisions by using a secondary hash of the key as an offset when a collision occurs

=============================================================

Linear probing

Initially i=0, if collision occurs value increased by 1, increasing the value linearly from 0 to 1,2.. and so on.

Hash(7)=(7+0)%11=7

Hash(36)=(36+0)%11=3

Hash(18)=(18+0)%11=7(collision occurs)

Repeat Hash(18)=(18+1)%11=8

Hash(62)=(62+0)%11=11(collisoion)

Repeat hash(62)=(62+1)%11=8 collision

Repeat hash(62)=(62+2)%11=9

Quadratic Probing

Jumping will be done

Hash(7)=(7+0)%11=7

Hash(36)=(36+0)%11=3

Hash(18)=(18+0)%11=7 collision occurs

Hash(18)=(18+1)%11=8

Hash(62)=(62+0)%11=7 collision

Hash(62)=(62+1)%11=8 collision

Hash(62)=(62+(2*2))%11=0

Time complexity in Hashing is o(1) If no collision comes.

If collision comes time complexity will be little bit more.

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Skills:

Core Java-OOPS,Threads,Exception Handling

Collection Framework

JDK 8 Features-Functional Programming,Streams,Lamda...

JDBC- using MySQL,Postgres,Oracle 11g,REDIS,Neo 4J,Mongo DB

GUI Programming-Applets,AWT,Swings

Server Side Coding Introduction-Tomcat Server

Servlets
JSP,MVC,JSTL,EL

JPA-Hibernate

Spring Framework

Spring Boot- RestAPI
Micro services

Real time web project

DevOps Tools- Jenkins ,Docker

Testing Tools-Junit,Mockito,TestNG

Maven

GIT and Git Hub-Colloboration-Project using these tools

AWS -importnat services

React JS( HTML5,CSS5,Java Script,Bootstrap) and Angular

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Academic back ground: BE CSE I.T,ECE,E&I, EEE,Mechanical, Civil,MCA and MS IT and age below 25

Duration : 60 hours-online(more hours if required) and half line based on your place-already employed could also join

Fees: 15 k in 3 installments

Placement assurance

Please send your resumes to varnant@gmail.com

Final year studnets could do a a live project

Laptop or Desktop is must with 4 gb RAM

Varnan 9791197980

Java Full stack Phase 1 training at Prakat Solutions(Infosys,Bangalore)

Completed a Technical training(24-11-2021 to18-12-2021)on contract basis -trained the employees of Praktan Solutions(Infosys Bangalore-supply chain management project) for 60 hours on contract basis.
Online mode throgh Zoom
1 Programming Concepts – Data types, Control flow, Data Structures and Algorithms
2 OOP and Classess
Advanced Java & Angular s
3 Client/Server Architecture in Javas
4 J2EE Architecture, MVCs
5 Helper Applicationss
6 Servlet Life cycle, Servlet API, Servlet configs
7 WebApp Listeners
8 Session Managements
9 CRUD operations using servletss
10 Angular – Core, Components, @input, @output, built in pipelines, HTTP client, custom servicess
11 Database Essentials – RDBMS, ER Modelling, Normalization, DML, DQL, DDLs
12 Web Applications - Client & Server Architecture, Web Server, IP, Port, Domain, URL, Hosting and Deployments
13 A look into HTML, CSS, TableLess Layout - Div, Span, Paragraph, List, etc..s
14 Javascript Essentials - Language fundamentals, Interactive elements in Javascripts
15 Exposure to cloud native development / cloud services (AWS / GCP / MS Azure)s
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Java Full Stack Training done at Iopex,Ambit IT Park,Ambattur,Chennai.

I completed Java Full Stack Training for 19 trainees(newly joined Employees)

The skills trained are Java Basics
OOPs & user defined packages,Access Modifiers
operator & assignments
Control statements,Pattern printing,Numerical computations,Debugging in Ecilipse
Exception handling,User defined exception,String String buffer String builder String tokenizer,Object class methods,overriding those methods
Threads
Collection API-Annotations,Generics,RegEx
io package
log file creation
MySQL -JDBC
REDIS JDBC
GUI- code Applets AWT Swings Even Handling
JDK 8 features-new features in interfaces,lamda expression ,time package,streams
Web basics-HTML DHTML-web page creation-website creation
HTML 5 and CSS 3 Online testing of website using tools and manual testing
Bootstrap- Java script-ECMA
React JS
React JS -single Page Application,SEO basics
Server side programming basics-Tomcat Server-Servlets
JSP-Expression Language,Maven,Logger
GIT GITHUB- JPA basics- Hibernate
Spring Framework
REST Api Introduction-Spring Boot-Auxios Library-React JS revisted to call webservice through Auxios
Project to start Capstone project-
Duration: 25 days- From October 4 2021 to November 18th 2021.
Mode of Training: Direct 21 days & online 4 days 32 hours
Capstone Projects done by all trainees individually using React JS and Axios or Browser fetch and Spring Boot REST web services using MySQL Database.

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Fresher Job Recruitment is going in many software companies.

we provide the training and show you the how to get through the online test and telephonic and direct interview.

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Panrutti area students may contact : Mr.Manavalan, Asst.professor ,St.Annes Engineering College Mobile:9787687094 7010824640

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Duration: 40 hours with mini-projects and online project -real time .

Fees:5000/-

BCA,BSC CS,MCA,MSC CS,B.E CSE B.Tech I.T,B.E (any branch)

Placement Assistance

With these skills one could enter into Software Industry and learn server side technologies to become a Full Stack Developer.

Java(Spring Frame Work,SpringBoot(REST API, Micro Services)

Duration:60 Hours Fees:10000/-

Node JS: Duration 21 hours Fees:3000/-

Python Duration: 21 hours Fees:3000/-

varnant@gmail.com

9791197980

Core Java Training

Course Title: Core Java Expert

Objective: A giant step towards an excellent career in Software-learning the nuts & bolts of Core Java

Content:

Why java.

Careers in Java

The strong basics of Core Java needed to learn Advanced Java Technologies-1 (Servlets,JSP,Beans,MVC,Hibernate,Spring Frame work,Spring boot Introduction) 1hour

Object Oriented Programming-1 hour

Data Types in java-1 hour

OOPs In Java-Classes,Interfaces,Nested Classes-2 Hours

Packages and Access modifiers-1 hour

Thread(mini project 1)-2 hours

Exception Handling(mini projects 2)

Exploring java.lang package-2 hours

Eclipse IDE-1 hour

Data Structures and java.util package(mini projects 3)-5 hours

Exploring java.io package(mini project 2) -2 hours

Exploring JDBC(Java Data Base Connectivity) 3 hours

Mysql(RDBMS)-Mini project 2 2 hours

REDIS (NO SQL)-Mini project 1 1 hour

GIT and Git Hub(Team Project) 2 Hours

Using MySQL in AWS Cloud -1 Hour

Using Redis(NoSQL) Google in Cloud-1 Hour

Using Java with SQL Server Azure-1 Hour

GUI programming 4 hours

Applets-Mini project1

AWT-Mini project 1

Swings-Major Project 2

Log 4 j:Mini project

Benefits:Strong basics in Core Java will help to learn advanced Java Technologies will assure you an excellent career in Java

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Interested in training others, online job seekers, college students from 1st year onwards, final year students, unemployed graduates, under employed graduates-age no bar.

Hardware Requirement:

40gb hard disk

4 gb ram

OS: Windows 10 or latest on Windows

Internet connection- a stable one is a must

Code samples and mini project codes will be shared

Fees: 5000/-INR

Varnan alias vellaivaranan-JAVA TRAINER

MCQs on Java

Shopping cart using Servlets

Hashing -Data Structure-Hashing in Java

Java Full Stack Training and Placement- On Line and Direct Training

Java Full Stack Training and Placement Drive for those who have passion towards a job in Software Industry...trainer has wide experience

This is one of the best careers in IT Industry

Academic back ground: BE CSE I.T,ECE,E&I, EEE,Mechanical, Civil,MCA and MS IT and age below 25

Duration : 60 hours-online(more hours if required) and half line based on your place-already employed could also join

Fees: 15 k in 3 installments

Placement assurance

Final year studnets could do a a live project

Laptop or Desktop is must with 4 gb RAM

Java Full stack Phase 1 training at Prakat Solutions(Infosys,Bangalore)

Java Full Stack Training done at Iopex,Ambit IT Park,Ambattur,Chennai.

I completed Java Full Stack Training for 19 trainees(newly joined Employees)

Fresher Jobs : Training and Placement 2021

Fresher Job Recruitment is going in many software companies.

we provide the training and show you the how to get through the online test and telephonic and direct interview.

Duration: 21 hours Online Timings:after 7 pm in week days Saturday & Sunday 11 am to 1 pm

Core Java basics(Technical Test online ).

For Details:Contact : Mr.T.Varnan 9791197980

Panrutti area students may contact : Mr.Manavalan, Asst.professor ,St.Annes Engineering College Mobile:9787687094 7010824640

Front-End Developer Training-Easy way to get a job in Software Industry

Core Java Training

python training with real time projects

Shopping cart using Servlets

Technical Skills for B.Com and B.B.A

JAVA TRAINING WORK SHOPS

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