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 br.com.apprestaurante.command; import br.com.apprestaurante.dao.MesaDao; import br.com.apprestaurante.entity.Mesa; import com.google.gson.JsonObject; import java.io.IOException; import java.io.PrintWriter; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * * @author isaias */ public class BuscarMesa implements CommandInterface { @Override public String execute(HttpServletRequest request, HttpServletResponse response) { HttpSession session = request.getSession(false); JsonObject json = new JsonObject(); PrintWriter out = null; try { response.setContentType("application/json"); out = response.getWriter(); if (session == null) { json.addProperty("ok", "400"); } else { Mesa mesa = new MesaDao().getById(Integer.parseInt(request.getParameter("codigoMesa"))); json.addProperty("numero", mesa.getNumero()); } } catch (IOException ex) { Logger.getLogger(BuscarProduto.class.getName()).log(Level.SEVERE, null, ex); } out.print(json); out.flush(); return null; } }