Servlet Introduction

title: Servlet Introduction description: Java Servlet kya hai aur kaise kaam karta hai

Servlet ek Java class hai jo web requests handle karta hai. Server-side Java programming.

Servlet kya karta hai?

HTTP Request receive karta hai (GET, POST)
Business logic execute karta hai
HTTP Response return karta hai (HTML, JSON, etc.)

Servlet vs JSP

Servlet — Java code mein HTML generate karna (Controller logic)
JSP — HTML mein Java code (View/presentation)

Maven Dependency

xml exampleWoHoTech

<dependency>
    <groupId>jakarta.servlet</groupId>
    <artifactId>jakarta.servlet-api</artifactId>
    <version>6.0.0</version>
    <scope>provided</scope>
</dependency>

Simple Servlet Example

java exampleWoHoTech

import jakarta.servlet.*;
import jakarta.servlet.http.*;
import java.io.*;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html><body>");
        out.println("<h1>Hello from Servlet!</h1>");
        out.println("</body></html>");
    }
}

web.xml Configuration (alternative to annotation)

xml exampleWoHoTech

<servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>com.example.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
</servlet-mapping>

title: Servlet Introduction description: Java Servlet kya hai aur kaise kaam karta hai

Servlet ek Java class hai jo web requests handle karta hai. Server-side Java programming.

Servlet kya karta hai?

HTTP Request receive karta hai (GET, POST)
Business logic execute karta hai
HTTP Response return karta hai (HTML, JSON, etc.)

Servlet vs JSP

Servlet — Java code mein HTML generate karna (Controller logic)
JSP — HTML mein Java code (View/presentation)

Maven Dependency

xml exampleWoHoTech

<dependency>
    <groupId>jakarta.servlet</groupId>
    <artifactId>jakarta.servlet-api</artifactId>
    <version>6.0.0</version>
    <scope>provided</scope>
</dependency>

Simple Servlet Example

java exampleWoHoTech

import jakarta.servlet.*;
import jakarta.servlet.http.*;
import java.io.*;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html><body>");
        out.println("<h1>Hello from Servlet!</h1>");
        out.println("</body></html>");
    }
}

web.xml Configuration (alternative to annotation)

xml exampleWoHoTech

<servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>com.example.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
</servlet-mapping>

Servlet Introduction

Servlet kya karta hai?

Servlet vs JSP

Maven Dependency

Simple Servlet Example

web.xml Configuration (alternative to annotation)

Continue learning this concept

Servlet Introduction

Servlet kya karta hai?

Servlet vs JSP

Maven Dependency

Simple Servlet Example

web.xml Configuration (alternative to annotation)

Continue learning this concept