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 mypackage; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.MongoClient; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.util.Set; 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 Kapil Gehlot */ public class Login extends HttpServlet { public boolean collectionExists(String name, DB db) { Set<String> collNames = db.getCollectionNames(); for (final String n : collNames) { if (n.equalsIgnoreCase(name)) { return true; } } return false; } protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); try (PrintWriter out = response.getWriter()) { /* TODO output your page here. You may use following sample code. */ String getUname = request.getParameter("uname"); String getPass = request.getParameter("upass"); MongoClient mongoClient = new MongoClient("localhost", 27017); DB db = mongoClient.getDB("mydb"); DBCollection coll = db.getCollection("ulogin"); DBObject bObject = new BasicDBObject(); bObject.put(getUname, getPass); DBCursor bCursor = coll.find(bObject); int count = bCursor.count(); if (count == 1) { HttpSession httpSession = request.getSession(true); httpSession.setAttribute("uname", getUname); if (!collectionExists(getUname + "DB", db)) { db.createCollection(getUname + "DB", bObject); } out.print("true"); } else { out.print("false"); } } } // <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 { processRequest(request, response); } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }