What is the difference between doGet and doPost in servlet?

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difference between doGet() and doPost(): In Java servlets, doGet() and doPost() are two methods that handle HTTP GET and POST requests, respectively. The main difference between the two methods is the type of request they handle and how the data is transmitted.

doGet() is used to handle HTTP GET requests, which are typically used to retrieve data from a server. GET requests send data as part of the URL query string, which means that the data is visible to the user and can be bookmarked or cached by the browser. doGet() method receives this data as a query string and can use it to generate a response.

doPost(), on the other hand, is used to handle HTTP POST requests, which are typically used to send data to a server. POST requests send data in the message body of the request, which means that the data is not visible to the user and cannot be bookmarked or cached by the browser. doPost() method receives this data as part of the request body and can use it to generate a response.

Here’s an example of how doGet() and doPost() might be used in a servlet:

Difference between doGet() and doPost() method in servlet

doGet()doPost()
1. all the data exposed in the URL.1. data is not exposed in the URL.
2. It is less secure.2. It is more secure.
3. upon refreshing the page we do not get any security popup alert.3. upon refreshing the page we get security popup alert. to avoid duplicate transaction
4. doGet() should be used when we get Data from the database.4. doPost() should be used when submitting the data to the database.
public class MyServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Retrieve data from the query string and generate a response
        String name = request.getParameter("name");
        response.getWriter().write("Hello, " + name);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Retrieve data from the request body and generate a response
        String name = request.getParameter("name");
        response.getWriter().write("Hello, " + name);
    }
}

In this example, the doGet() method retrieves data from the query string and generates a response, while the doPost() method retrieves data from the request body and generates a response. The choice of which method to use depends on the type of request being handled and how the data is transmitted.

Servlet interview questions

  • Q.1 -How many objects of a servlet are created?
  • Q.2 -What is the life cycle of a servlet?
  • Q.3 -What are the life-cycle methods for a servlet?
  • Q.4 -Who is responsible to create the object of the servlet?
  • Q.5 -When servlet object is created?
  • Q.5 -What is the difference between PrintWriter and ServletOutputStream?
  • Q.6 -What is the difference between GenericServlet and HttpServlet?
  • Q.7 -What is servlet collaboration?
  • Q.8 -What is the purpose of the RequestDispatcher Interface?
  • Q.9 -Can you call a jsp from the servlet?
  • Q.10 -Can you call a jsp from the servlet?
  • Q.11 -Difference between forward() method and sendRedirect() method?
  • Q.12 – What is difference between ServletConfig and ServletContext?
  • Q.13 -What is Session Tracking?

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