Basic Servlet

A basic Java servlet program that demonstrates handling GET, POST, PUT, and DELETE requests with examples for each HTTP method. You'll need a Java Servlet container like Apache Tomcat to run this code.

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CRUDServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    // Handling GET request
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().println("Handling GET request");
    }

    // Handling POST request
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().println("Handling POST request");
    }

    // Handling PUT request
    protected void doPut(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().println("Handling PUT request");
    }

    // Handling DELETE request
    protected void doDelete(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().println("Handling DELETE request");
    }
}

This servlet defines four methods to handle each of the HTTP methods (GET, POST, PUT, DELETE).

Here are examples of how to use these HTTP methods:

1. GET Request:

   • Open a web browser and navigate to http://your-server/context-root/example (replace "your-server" and "context-root" with the appropriate values).

   • You'll see "Handling GET request" displayed in the browser.

2. POST Request:

   • You can use a tool like curl to send a POST request from the command line:

     curl -X POST http://your-server/context-root/example

   • You'll see "Handling POST request" displayed in the response.

3. PUT Request:

   • You can use curl to send a PUT request from the command line:

     curl -X PUT http://your-server/context-root/example

   • You'll see "Handling PUT request" displayed in the response.

4. DELETE Request:

   • You can use curl to send a DELETE request from the command line:

     curl -X DELETE http://your-server/context-root/example

   • You'll see "Handling DELETE request" displayed in the response.

Remember to replace "your-server" and "context-root" with the appropriate values based on your server configuration.