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- package com.journaldev.servlet;
- import java.io.IOException;
- import java.io.PrintWriter;
- import javax.servlet.RequestDispatcher;
- import javax.servlet.ServletException;
- import javax.servlet.annotation.WebInitParam;
- import javax.servlet.annotation.WebServlet;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- /**
- * Servlet implementation class LoginServlet
- */
- @WebServlet(
- description = "Login Servlet",
- urlPatterns = { "/LoginServlet" },
- initParams = {
- @WebInitParam(name = "user", value = "Pankaj"),
- @WebInitParam(name = "password", value = "journaldev")
- })
- public class LoginServlet extends HttpServlet {
- private static final long serialVersionUID = 1L;
- public void init() throws ServletException {
- //we can create DB connection resource here and set it to Servlet context
- if(getServletContext().getInitParameter("dbURL").equals("jdbc:mysql://localhost/mysql_db") &&
- getServletContext().getInitParameter("dbUser").equals("mysql_user") &&
- getServletContext().getInitParameter("dbUserPwd").equals("mysql_pwd"))
- getServletContext().setAttribute("DB_Success", "True");
- else throw new ServletException("DB Connection error");
- }
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- //get request parameters for userID and password
- String user = request.getParameter("user");
- String pwd = request.getParameter("pwd");
- //get servlet config init params
- String userID = getServletConfig().getInitParameter("user");
- String password = getServletConfig().getInitParameter("password");
- //logging example
- log("User="+user+"::password="+pwd);
- if(userID.equals(user) && password.equals(pwd)){
- response.sendRedirect("LoginSuccess.jsp");
- }else{
- RequestDispatcher rd = getServletContext().getRequestDispatcher("/login.html");
- PrintWriter out= response.getWriter();
- out.println("<font color=red>Either user name or password is wrong.</font>");
- rd.include(request, response);
- }
- }
- }
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