package com.baeldung.javaeeannotations; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.annotation.WebInitParam; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet( name = "BankAccountServlet", description = "Represents a Bank Account and it's transactions", urlPatterns = {"/account", "/bankAccount" }, initParams = { @WebInitParam(name = "type", value = "savings") } ) /*@ServletSecurity( value = @HttpConstraint(rolesAllowed = {"Member"}), httpMethodConstraints = {@HttpMethodConstraint(value = "POST", rolesAllowed = {"Admin"})} )*/ public class AccountServlet extends javax.servlet.http.HttpServlet { String accountType = null; public void init(ServletConfig config) throws ServletException { accountType = config.getInitParameter("type"); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { PrintWriter writer = response.getWriter(); writer.println("Hello, I am an AccountServlet!"); writer.flush(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { double accountBalance = 1000d; String paramDepositAmt = request.getParameter("dep"); double depositAmt = Double.parseDouble(paramDepositAmt); accountBalance = accountBalance + depositAmt; PrintWriter writer = response.getWriter(); writer.println(" Balance of " + accountType + " account is: " + accountBalance + ""); writer.flush(); } }