Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.servlet; import com.beans.Employee; import com.beans.PasswordHash; import com.dbops.DBcon; import com.mongodb.BasicDBObject; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import java.io.IOException; import java.io.PrintWriter; import java.security.NoSuchAlgorithmException; import java.security.spec.InvalidKeySpecException; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * * @author Lakshan */ public class ChangePassword extends HttpServlet { /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> * methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { /* TODO output your page here. You may use following sample code. */ out.println("<!DOCTYPE html>"); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet ChangePassword</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Servlet ChangePassword at " + request.getContextPath() + "</h1>"); out.println("</body>"); out.println("</html>"); } finally { out.close(); } } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { String oldPass = request.getParameter("oldPass"); String newPass = request.getParameter("newPass"); String userEmail = request.getParameter("userEmail"); DBcon dbcon = new DBcon(); dbcon.getDbCon(); DBCollection coll = dbcon.getData("employee"); BasicDBObject search = new BasicDBObject("email", userEmail); DBCursor cursor = coll.find(search); DBObject dbo = cursor.next(); Employee c = Employee.fromDBObject(dbo); PrintWriter out = response.getWriter(); if (PasswordHash.validatePassword(oldPass, c.getPassword())) { BasicDBObject update = new BasicDBObject("$set", new BasicDBObject("password", PasswordHash.createHash(newPass))); dbcon.updateData("employee", search, update); out.print("done"); } else { // out.print("Your Old Password is Incorrect"); } } catch (NoSuchAlgorithmException ex) { Logger.getLogger(ChangePassword.class.getName()).log(Level.SEVERE, null, ex); } catch (InvalidKeySpecException ex) { Logger.getLogger(ChangePassword.class.getName()).log(Level.SEVERE, null, ex); } } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }