MyPack.AjaxFriendList.java Source code

Introduction

Here is the source code for MyPack.AjaxFriendList.java

Source

/*
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 */
package MyPack;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.json.JSONArray;

/**
 *
 * @author Arpit Kesharwani
 */
@WebServlet(name = "AjaxFriendList", urlPatterns = { "/AjaxFriendList" })
public class AjaxFriendList extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @return
     * @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 {

    }

    // <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);

        response.setContentType("text/html;charset=UTF-8");
        response.setHeader("Cache-control", "no-cache, no-store");
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Expires", "-1");
        HttpSession s = request.getSession(true);
        try (PrintWriter out = response.getWriter()) {
            //getting AJAX parameter
            String query = request.getParameter("term");
            //Creating JSONArray Object
            JSONArray arrayObj = new JSONArray();
            //Changing Case of AJAX parameter
            query = query.toLowerCase();

            try {
                Connection con = ConnectionClass.getConnected();
                PreparedStatement p = con
                        .prepareStatement("select name from friend where name LIKE '" + query + "%'");
                ResultSet rs = p.executeQuery();
                while (rs.next() == true) {
                    arrayObj.put(rs.getString(1));
                }
                out.println(arrayObj.toString());
                out.close();
            } catch (SQLException ea) {
            }
        }
    }

    /**
     * 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>

}