home.java Source code

Introduction

Here is the source code for home.java

Source

/*
 * 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.
 */

import com.mongodb.BasicDBList;
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.IOException;
import java.io.PrintWriter;
import static java.lang.System.console;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author cgl
 */
@WebServlet(urlPatterns = { "/home" })
public class home 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();
        response.setContentType("text/html");
        String username = request.getParameter("username");

        String tweet = request.getParameter("tweet");
        try {
            MongoClient mongo = new MongoClient("localhost", 27017);
            DB db = mongo.getDB("test");
            System.out.println("Connection established");
            DBCollection User = db.getCollection("User");
            DBCollection Tweet = db.getCollection("Tweet");

            DBCursor cursor = Tweet.find();
            int count = 0;
            if (cursor.size() < 1) {
                count = 1;
            } else {
                count = cursor.size() + 1;

            }
            BasicDBObject document = new BasicDBObject();
            document.put("tweet_id", count);
            document.put("username", username);
            document.put("tweet_text", tweet);
            document.put("date", new Date());
            Tweet.insert(document);

            ArrayList<Integer> tweet_id = new ArrayList();
            tweet_id.add(count);
            DBObject searchObject = new BasicDBObject();
            searchObject.put("username", username);

            DBObject modifiedObject = new BasicDBObject();
            modifiedObject.put("$push", new BasicDBObject().append("tweet_id", count));
            User.update(searchObject, modifiedObject);

            out.println(tweet);
        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
        }
    }

    // <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>

}