Java.Servlets.What steps should be taken when creating servlets?

🛠️ Steps to Create a Servlet (Classic web.xml Approach)

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✅ 1. Create a Java Class That Extends HttpServlet

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().write("<h1>Hello, Stanley!</h1>");
    }
}

✅ 2. Compile the Servlet

Make sure to include the servlet API jar in your classpath:

javac -classpath /path/to/servlet-api.jar HelloServlet.java

✅ 3. Create a Deployment Structure (WAR-like)

Your project structure should look like:

/MyApp
├── WEB-INF/
│   ├── web.xml
│   └── classes/
│       └── HelloServlet.class

✅ 4. Define the Servlet in web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="3.1">
  <servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>HelloServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>
</web-app>

✅ 5. Deploy to a Servlet Container (e.g., Tomcat)

• Package everything in a .war file:

jar -cvf MyApp.war *

Place it in:

/path/to/tomcat/webapps/

Start Tomcat:

catalina.sh run

Open in browser:

http://localhost:8080/MyApp/hello

Boom 💥! You’ve built a working servlet.

🧪 Modern Approach with Annotations (No web.xml Required)

import javax.servlet.annotation.WebServlet;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
        res.getWriter().write("Hello from annotated servlet!");
    }
}

Just compile & deploy — servlet container reads the annotation.

🔁 Summary of Steps

Step	Description
1. Create Servlet Class	Extend HttpServlet, override methods
2. Compile It	Include servlet-api.jar
3. Create Web App Structure	Place .class in WEB-INF/classes
4. Configure (web.xml)	Or use @WebServlet annotation
5. Deploy to Container	Like Tomcat or Jetty
6. Access via Browser	Based on mapped URL pattern