GetMachine.java Source code

Introduction

Here is the source code for GetMachine.java

Source

/*
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 * and open the template in the editor.
 */

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
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 org.json.JSONArray;
import org.json.JSONObject;

/**
 *
 * @author jasleen
 */
@WebServlet(urlPatterns = { "/GetMachine" })
public class GetMachine extends HttpServlet {
    Statement statement;
    ResultSet resultSet;
    static Connection connect;

    /**
     * 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("application/json");
        response.addHeader("Access-Control-Allow-Origin", "*");
        try {
            /* TODO output your page here. You may use following sample code. */
            PrintWriter out = response.getWriter();
            connect = getConnection();
            statement = connect.createStatement();
            resultSet = statement.executeQuery("SELECT distinct(machine) FROM lab3.logs");
            JSONArray ja = new JSONArray();
            while (resultSet.next()) {
                JSONObject obj = new JSONObject();
                obj.put("id", resultSet.getString(1));
                obj.put("reg", resultSet.getString(1));
                ja.put(obj);
            }
            out.println(ja);
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    Connection getConnection() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            // setup the connection with the DB.
            connect = DriverManager.getConnection("jdbc:mysql://localhost/lab3?" + "user=root&password=root");
        } catch (Exception e) {
            //System.out.println(e);
        }
        return connect;
    }

    // <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>

}