Example usage for com.google.gson Gson Gson

List of usage examples for com.google.gson Gson Gson

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Introduction

In this page you can find the example usage for com.google.gson Gson Gson.

Prototype

public Gson()

Source Link

Document

Constructs a Gson object with default configuration.

Usage

From source file:WSClient.java

public Response doRequest(String path, Object object) throws IOException {

    Response response = null;/*ww  w .j a  v a2  s.c  om*/

    try {
        URL url = new URL(BASE_URL + path);
        System.out.println("##### utl : " + BASE_URL + path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/json");
        //String input = "{\"qty\":100,\"name\":\"iPad 4\"}";
        Gson gson = new Gson();
        String input = gson.toJson(object);

        OutputStream os = conn.getOutputStream();
        os.write(input.getBytes());
        os.flush();

        /*if (conn.getResponseCode() != HttpURLConnection.HTTP_CREATED) {
           throw new RuntimeException("Failed : HTTP error code : "
              + conn.getResponseCode());
        }*/

        BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
        StringBuilder content = new StringBuilder("");
        String output;
        System.out.println("Output from Server .... \n");
        while ((output = br.readLine()) != null) {
            System.out.println(output);
            content.append(output);

        }
        conn.disconnect();

        System.out.println(" content :" + content.toString());
        response = gson.fromJson(content.toString(), Response.class);

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();

    }

    return response;
}

From source file:ListImages.java

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {
        try {/*from w  ww . j ava 2s .  c om*/
            emf = Persistence.createEntityManagerFactory("FileUploadPU");
            em = emf.createEntityManager();

            List<String> list = new ArrayList<String>();
            List<Date> uploadTime = new ArrayList<Date>();

            for (Imagenew i : (List<Imagenew>) em.createNamedQuery("Imagenew.findAll").getResultList()) {

                list.add(i.getPath());
                uploadTime.add(i.getUploaddate());

            }
            String json = new Gson().toJson(list);

            out.write(json);

        } catch (Exception e) {
            System.out.println(e);
        } finally {
            em.close();
            emf.close();
        }
    }
}

From source file:PokemonServlet.java

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods./*from   www  . ja  v a 2  s . c om*/
 *
 * @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 {

    try (PrintWriter out = response.getWriter()) {
        /* TODO output your page here. You may use following sample code. */

        Connection con = ConBD.getConnection();

        if (con == null) {
            throw new SQLException("Erro conectando");
        }
        Gson gson = new Gson();
        Statement stm = con.createStatement();

        Pokemon pokemon = new Pokemon();
        pokemon.setNome(request.getParameter("txt-nome"));
        pokemon.setCp(request.getParameter("txt-cp"));
        pokemon.setGen(request.getParameter("txt-gen"));
        pokemon.setCandy(request.getParameter("txt-candy"));
        out.println(pokemon.getNome());

        String insert = "INSERT INTO pokemon (nome,cp,gen,candy)" + "VALUES(?, ?, ?, ?)";
        PreparedStatement preparedStatement = con.prepareStatement(insert);
        preparedStatement.setString(1, pokemon.getNome());
        preparedStatement.setString(2, pokemon.getCp());
        preparedStatement.setString(3, pokemon.getGen());
        preparedStatement.setString(4, pokemon.getCandy());
        preparedStatement.executeUpdate();

    } catch (SQLException ex) {

    } catch (Exception e) {

    }

}

From source file:CompaniesEditor.java

public String toJson(Map<Integer, Company> companies) {
    Gson gson = new Gson();
    String json = gson.toJson(companies);
    return json;
}

From source file:InventoryAddNewItemServlet.java

License:Open Source License

@Override
public HttpResponse doWork(HttpRequest request, String rootDirectory) {
    HttpResponse response;/*  w w w  . j av a  2 s .c o m*/
    try {
        String inventoryUrl = "./web/inventory.json";
        File inventory = new File(inventoryUrl);

        StringBuilder sb = new StringBuilder();
        Scanner sc = new Scanner(inventory);
        while (sc.hasNext()) {
            sb.append(sc.nextLine());
        }
        sc.close();

        // Add this new book to the list of existing books
        Gson gson = new Gson();
        InventoryObject[] inventoryArray = gson.fromJson(sb.toString(), InventoryObject[].class);
        ArrayList<InventoryObject> inventoryList = new ArrayList<InventoryObject>(
                Arrays.asList(inventoryArray));

        String body = new String(request.getBody());
        System.out.println(body);
        String[] newItem = body.split("&");

        // Add new item
        int id, quant;
        String name;
        try {
            id = Integer.parseInt(newItem[0].split("=")[1]);
            name = newItem[1].split("=")[1].replace("+", " ");
            quant = Integer.parseInt(newItem[2].split("=")[1]);
        } catch (Exception e) {
            return HttpResponseFactory.create400BadRequest(Protocol.CLOSE);
        }

        InventoryObject item = new InventoryObject(id, name, quant);
        if (quant < 0) {
            return HttpResponseFactory.create400BadRequest(Protocol.CLOSE);
        }
        for (InventoryObject existingItem : inventoryList) {
            if (existingItem.getID() == id) {
                return HttpResponseFactory.create400BadRequest(Protocol.CLOSE);
            }
        }
        inventoryList.add(item);

        // Serialize new list
        Gson gsonBuilder = new GsonBuilder().setPrettyPrinting().create();
        String arrayListToJson = gsonBuilder.toJson(inventoryList);

        BufferedWriter bw = new BufferedWriter(new FileWriter(inventory));
        bw.write(arrayListToJson);
        bw.close();

        response = HttpResponseFactory.create200OK(inventory, Protocol.CLOSE);
    } catch (Exception e) {
        response = HttpResponseFactory.create404NotFound(Protocol.CLOSE);
    }
    return response;
}

From source file:servletAjaxCadastro.java

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods.//from  w  ww.  j a  v a  2s  . co  m
 *
 * @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");
    String action = request.getParameter("acao");

    if ("cpf".equals(action)) {
        try (PrintWriter out = response.getWriter()) {
            //out.println(action);
            ClienteDao clienteDao = new ClienteDao();
            /* TODO output your page here. You may use following sample code. */

            String cpf = request.getParameter("cpf");
            Cliente cliente = new Cliente();
            cliente.setCpf(cpf);
            String json;
            if (clienteDao.verificaCpf(cliente)) {
                json = new Gson().toJson("CPF ja cadastrado!");
            } else {
                json = new Gson().toJson("Ok");
            }

            response.setContentType("application/json");
            response.setCharacterEncoding("UTF-8");
            response.getWriter().write(json);
        }
    }
    if ("login".equals(action)) {
        try (PrintWriter out = response.getWriter()) {
            ClienteDao clienteDao = new ClienteDao();

            String login = request.getParameter("login");
            Cliente cliente = new Cliente();
            cliente.setCpf(login);
            String json;
            if (clienteDao.verificaLogin(cliente)) {
                json = new Gson().toJson("Login ja cadastrado!");
            } else {
                json = new Gson().toJson("Ok");
            }
            response.setContentType("application/json");
            response.setCharacterEncoding("UTF-8");
            response.getWriter().write(json);
        }

    }

}

From source file:CompanyController.java

public static <T extends Object> T fromJson(String json, Class<T> classe) {
    Gson gson = new Gson();
    gson.fromJson(json, classe);// w  ww.j av  a 2  s.  c o m
    return gson.fromJson(json, classe);

}

From source file:CompanyController.java

public static String toJson(Object value) {

    Gson gson = new Gson();
    String json = gson.toJson(value);
    return json;

}

From source file:City_Servlet.java

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods./*from w  w w. ja  v  a 2  s  . com*/
 *
 * @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");
    try (PrintWriter out = response.getWriter()) {

        try {
            String state = request.getParameter("state");
            String JDBC_driver = "com.mysql.jdbc.Driver";
            String DB_URL = "jdbc:mysql://localhost:3306/wheels_on_rent";
            Class.forName(JDBC_driver);
            String db_user = "root";
            String db_pass = "";

            Connection conn = DriverManager.getConnection(DB_URL, db_user, db_pass);
            String query = "SELECT `City` FROM `india_states_cities` WHERE"
                    + "`State/Union Territory` =? AND `City` IS NOT NULL";
            PreparedStatement pst = conn.prepareStatement(query);
            pst.setString(1, state);
            ResultSet rs = pst.executeQuery();

            String json;
            ArrayList<City> listCity = new ArrayList<City>();
            if (!rs.next()) {
                out.print("rs is null");
            }
            while (rs.next()) {
                City c = new City();
                c.setCity_name(rs.getString("City"));

                listCity.add(c);
            }
            Gson g = new Gson();

            json = g.toJson(listCity);
            out.print(json);

            rs.close();
            pst.close();
            conn.close();
        } catch (Exception ex) {
            out.print("error" + ex.getMessage());
        }
    } catch (IOException ex) {
        Logger.getLogger(State_Servlet.class.getName()).log(Level.SEVERE, null, ex);
    }

}

From source file:CommentServlet.java

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {
        /* TODO output your page here. You may use following sample code. */
        try {//from   w  w  w . j av  a  2 s.  c o  m
            emf = Persistence.createEntityManagerFactory("FileUploadPU");
            em = emf.createEntityManager();

            List<String> list = new ArrayList<String>();

            for (Commentnew i : (List<Commentnew>) em.createNamedQuery("Commentnew.findAll").getResultList()) {

                list.add(i.getText());

            }
            String json2 = new Gson().toJson(list);

            out.write(json2);

        } catch (Exception e) {
            System.out.println(e);
        } finally {
            em.close();
            emf.close();
        }
    }
}