Example usage for com.google.gson Gson toJson

Introduction

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

Prototype

@SuppressWarnings("unchecked")
public void toJson(Object src, Type typeOfSrc, JsonWriter writer) throws JsonIOException 

Source Link

Document

Writes the JSON representation of src of type typeOfSrc to writer .

Usage

From source file:ContattiSQL.java

protected void doGetSingle(String contattoId, HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    Connection con = getConnection();
    Statement stmt = null;/*from w  w w  .j a v a 2  s  . c  o  m*/
    ResultSet rs = null;
    try {
        stmt = con.createStatement();
    } catch (SQLException ex) {
        Logger.getLogger(ContattiSQL.class.getName()).log(Level.SEVERE, null, ex);
    }
    try {
        rs = stmt.executeQuery("SELECT ContattoId, Cognome, Nome, EMail FROM dbo.Contatti"
                + " Where ContattoId = " + contattoId);
        rs.next();
        ContattoViewModel viewModel = new ContattoViewModel();
        viewModel.cognome = rs.getString(2);
        viewModel.nome = rs.getString(3);
        viewModel.email = rs.getString(4);

        JsonWriter writer = new JsonWriter(response.getWriter());
        Gson gson = new Gson();
        gson.toJson(viewModel, ContattoViewModel.class, writer);

    } catch (SQLException ex) {
        Logger.getLogger(ContattiSQL.class.getName()).log(Level.SEVERE, null, ex);
    }

}

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From source file:ContattiSQL.java

/**
 * Handles the HTTP <code>POST</code> method.
 *
 * @param request servlet request//from w w  w  .  j av a  2 s.co m
 * @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 {

    BufferedReader reader = request.getReader();
    Gson gson = new Gson();
    ContattoViewModel contatto = (ContattoViewModel) gson.fromJson(reader, ContattoViewModel.class);

    try {
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(ContattiSQL.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(ContattiSQL.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(ContattiSQL.class.getName()).log(Level.SEVERE, null, ex);
        }
        Connection con = DriverManager.getConnection(
                "jdbc:sqlserver://127.0.0.1;instanceName=SQLSERVER2012;databaseName=ITS2014;user=its2014;password=its2014;");
        Statement stmt = con.createStatement();

        String sql = "insert into dbo.Contatti (Cognome, Nome, EMail) " + "VALUES(" + "'" + contatto.cognome
                + "'" + ", '" + contatto.nome + "'" + ", '" + contatto.email + "'" + ")";

        stmt.execute(sql);

        JsonWriter writer = new JsonWriter(response.getWriter());
        gson.toJson(Risposta.OK, Risposta.class, writer);

        con.close();

    } catch (SQLException ex) {
        Logger.getLogger(ContattiSQL.class.getName()).log(Level.SEVERE, null, ex);
    }

}

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From source file:BundleTypeAdapterFactory.java

License:Apache License

@SuppressWarnings("unchecked")
@Override/*  w  w w . j av a 2s .  c  o m*/
public <T> TypeAdapter<T> create(final Gson gson, TypeToken<T> type) {
    if (!Bundle.class.isAssignableFrom(type.getRawType())) {
        return null;
    }
    return (TypeAdapter<T>) new TypeAdapter<Bundle>() {
        @Override
        public void write(JsonWriter out, Bundle bundle) throws IOException {
            if (bundle == null) {
                out.nullValue();
                return;
            }
            out.beginObject();
            for (String key : bundle.keySet()) {
                out.name(key);
                Object value = bundle.get(key);
                if (value == null) {
                    out.nullValue();
                } else {
                    gson.toJson(value, value.getClass(), out);
                }
            }
            out.endObject();
        }

        @Override
        public Bundle read(JsonReader in) throws IOException {
            switch (in.peek()) {
            case NULL:
                in.nextNull();
                return null;
            case BEGIN_OBJECT:
                return toBundle(readObject(in));
            default:
                throw new IOException("expecting object: " + in.getPath());
            }
        }

        private Bundle toBundle(List<Pair<String, Object>> values) throws IOException {
            Bundle bundle = new Bundle();
            for (Pair<String, Object> entry : values) {
                String key = entry.first;
                Object value = entry.second;
                if (value instanceof String) {
                    bundle.putString(key, (String) value);
                } else if (value instanceof Integer) {
                    bundle.putInt(key, ((Integer) value).intValue());
                } else if (value instanceof Long) {
                    bundle.putLong(key, ((Long) value).longValue());
                } else if (value instanceof Double) {
                    bundle.putDouble(key, ((Double) value).doubleValue());
                } else if (value instanceof Parcelable) {
                    bundle.putParcelable(key, (Parcelable) value);
                } else if (value instanceof List) {
                    List<Pair<String, Object>> objectValues = (List<Pair<String, Object>>) value;
                    Bundle subBundle = toBundle(objectValues);
                    bundle.putParcelable(key, subBundle);
                } else {
                    throw new IOException("Unparcelable key, value: " + key + ", " + value);
                }
            }
            return bundle;
        }

        private List<Pair<String, Object>> readObject(JsonReader in) throws IOException {
            List<Pair<String, Object>> object = new ArrayList<Pair<String, Object>>();
            in.beginObject();
            while (in.peek() != JsonToken.END_OBJECT) {
                switch (in.peek()) {
                case NAME:
                    String name = in.nextName();
                    Object value = readValue(in);
                    object.add(new Pair<String, Object>(name, value));
                    break;
                case END_OBJECT:
                    break;
                default:
                    throw new IOException("expecting object: " + in.getPath());
                }
            }
            in.endObject();
            return object;
        }

        private Object readValue(JsonReader in) throws IOException {
            switch (in.peek()) {
            case BEGIN_ARRAY:
                return readArray(in);
            case BEGIN_OBJECT:
                return readObject(in);
            case BOOLEAN:
                return in.nextBoolean();
            case NULL:
                in.nextNull();
                return null;
            case NUMBER:
                return readNumber(in);
            case STRING:
                return in.nextString();
            default:
                throw new IOException("expecting value: " + in.getPath());
            }
        }

        private Object readNumber(JsonReader in) throws IOException {
            double doubleValue = in.nextDouble();
            if (doubleValue - Math.ceil(doubleValue) == 0) {
                long longValue = (long) doubleValue;
                if (longValue >= Integer.MIN_VALUE && longValue <= Integer.MAX_VALUE) {
                    return (int) longValue;
                }
                return longValue;
            }
            return doubleValue;
        }

        @SuppressWarnings("rawtypes")
        private List readArray(JsonReader in) throws IOException {
            List list = new ArrayList();
            in.beginArray();
            while (in.peek() != JsonToken.END_ARRAY) {
                Object element = readValue(in);
                list.add(element);
            }
            in.endArray();
            return list;
        }
    };
}

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From source file:ScoresServlet.java

/**
 * Handles the HTTP <code>POST</code> method.
 *
 * @param request servlet request//from   w w w .ja  v  a 2s .  co  m
 * @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);  

    BufferedReader reader = request.getReader();
    Gson gson = new Gson();
    ScoreViewModel contatto = (ScoreViewModel) gson.fromJson(reader, ScoreViewModel.class);

    try {
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(ScoresServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(ScoresServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(ScoresServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
        Connection con = DriverManager.getConnection(
                "jdbc:sqlserver://127.0.0.1;instanceName=SQLSERVER2012;databaseName=FlappyBird;user=flappybird;password=flappybird;");
        Statement stmt = con.createStatement();

        String sql = "insert into dbo.Scores (Username, Score) " + "VALUES(" + "'" + contatto.username + "'"
                + ", '" + contatto.score + "'" + ")";

        stmt.execute(sql);

        JsonWriter writer = new JsonWriter(response.getWriter());
        gson.toJson(Risposta.OK, Risposta.class, writer);

        con.close();

    } catch (SQLException ex) {
        Logger.getLogger(ScoresServlet.class.getName()).log(Level.SEVERE, null, ex);
    }

}

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From source file:ca.ualberta.cs.asn1.CounterSaveModel.java

License:Apache License

public void saveData(List<CounterModel> list) {
    try {// w  ww . j  a v a2 s.  c o  m
        FileOutputStream fos = fileContext.openFileOutput(FILE_NAME, Context.MODE_PRIVATE);
        OutputStreamWriter osw = new OutputStreamWriter(fos);
        Gson gson = new Gson();
        Type fooType = new TypeToken<ArrayList<CounterModel>>() {
        }.getType();
        gson.toJson(list, fooType, osw);
        osw.close();
        fos.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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