NetBeans For Java With GlassFish Tomcat
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NetBeans for Java with GlassFish/Tomcat: (select All option)) and create a servlet to display a table that contains factorials for the numbers from 0 to 10, as shown in Figure1. Number Factorial
Paper For Above instruction
Introduction
The development of Java web applications utilizing NetBeans IDE integrated with GlassFish or Tomcat servers provides a robust environment for deploying dynamic web applications. This paper guides through creating a Java servlet that dynamically displays a table of factorial values for numbers 0 through 10. The process includes designing the application architecture, implementing the servlet, setting up deployment, testing, and documenting the process comprehensively.
Application Architecture Design
The architecture follows a traditional Model-View-Controller (MVC) pattern, ensuring separation of concerns:
- Model: A Java class calculating factorial values.
- Controller: A servlet handling HTTP requests, invoking the model, and forwarding data to view.
- View: A JSP page that displays the factorial table.
This architecture promotes modularity, ease of maintenance, and scalability. The servlet acts as the controller, receiving requests, processing data, and dispatching to the JSP view for rendering.
Implementation Details
The core task involves creating a servlet that calculates factorials of numbers from 0 to 10 and displays them in a tabular format. The steps are as follows:
Step 1: Set Up the Environment
- Install and open NetBeans IDE (version 12.5 or later recommended).
- Ensure Tomcat or GlassFish server is installed and configured within NetBeans.
- Create a new Java Web Application project targeting the selected server.
- Name the project appropriately, e.g., "FactorialWebApp".
Step 2: Create the Model Class for Factorial Calculation
A simple Java class named `FactorialCalculator` calculates the factorial:
```java
public class FactorialCalculator {
public static long computeFactorial(int number) {
long factorial = 1;
for (int i = 2; i
factorial *= i;
}
return factorial;
}
}
```
Step 3: Develop the Servlet Controller
Create a servlet named `FactorialServlet` with URL pattern `/factorials`. The servlet's doGet method calculates factorials for numbers 0 through 10 and forwards the data to a JSP page:
```java
@WebServlet("/factorials")
public class FactorialServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List
List
for (int num : numbers) {
factorials.add(FactorialCalculator.computeFactorial(num));
}
request.setAttribute("numbers", numbers);
request.setAttribute("factorials", factorials);
request.getRequestDispatcher("/factorialTable.jsp").forward(request, response);
}
}
```
Step 4: Create the JSP View
The JSP file `factorialTable.jsp` renders the table:
```jsp
Factorials Table
| Number | Factorial |
|---|---|
| ${numbers[index]} | ${factorials[index]} |