tweetList.java Source code

Introduction

Here is the source code for tweetList.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 = { "/tweetList" })
public class tweetList 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");

        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");

            BasicDBObject query = new BasicDBObject("username", username);
            DBCursor curssc = User.find(query);
            // out.println(curssc.size());
            DBObject result = curssc.next();
            ArrayList<String> arr2 = new ArrayList();
            arr2 = (ArrayList<String>) result.get("tweet_id");

            ArrayList<String> e = new ArrayList();
            e = (ArrayList<String>) result.get("following_username");
            ArrayList<String> texts = new ArrayList();
            //out.println(e.size());
            //out.println(e.get(0));

            if (e.size() > 0 || arr2.size() > 0) {
                for (int i = e.size() - 1; i >= 0; i--) {
                    BasicDBObject query2 = new BasicDBObject("username", e.get(i));
                    DBCursor curssc2 = User.find(query2);
                    if (curssc2.size() == 1) {
                        DBObject res = curssc2.next();
                        ArrayList<String> arr = new ArrayList();
                        arr = (ArrayList<String>) res.get("tweet_id");

                        texts.addAll(arr);

                    }

                }
                texts.addAll(arr2);
                Collections.sort(texts);
                for (int j = texts.size() - 1; j >= 0; j--) {
                    BasicDBObject query3 = new BasicDBObject("tweet_id", texts.get(j));
                    DBCursor curssc3 = Tweet.find(query3);
                    DBObject result1 = curssc3.next();
                    response.getWriter().write(result1.get("username").toString());
                    response.getWriter().write(":  ");
                    response.getWriter().write(result1.get("tweet_text").toString());
                    response.getWriter().write("\n");
                }

            } else {
                response.getWriter().write("No 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>

}