Examples of com.google.gson.Gson.fromJson()

com.google.gson.Gson.fromJson()
This method deserializes the specified Json into an object of the specified class. It is not suitable to use if the specified class is a generic type since it will not have the generic type information because of the Type Erasure feature of Java. Therefore, this method should not be used if the desired type is a generic type. Note that this method works fine if the any of the fields of the specified object are generics, just the object itself should not be a generic type. For the cases when the object is of generic type, invoke {@link #fromJson(String,Type)}. If you have the Json in a {@link Reader} instead ofa String, use {@link #fromJson(Reader,Class)} instead. @param < T> the type of the desired object @param json the string from which the object is to be deserialized @param classOfT the class of T @return an object of type T from the string @throws JsonParseException if json is not a valid representation for an object of typeclassOfT

  protected void execute(HttpServletRequest req, HttpServletResponse resp) {


    Compra compra = new Compra();


    Gson gson = new Gson();
    List<Integer> ids =  gson.fromJson(req.getParameter("produtos"), new TypeToken<List<Integer>>(){}.getType());


    for (Integer id : ids) {
      Produto p = jdo.findById(Produto.class, id);


      compra.setTotal(compra.getTotal().add(p.getPreco()));

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    this.itensJSON = new Text(gson.toJson(this.itens));
  }


  public void loadJSON() {
    Gson gson = new Gson();
    this.itens = gson.fromJson(this.itensJSON.getValue(), new TypeToken<List<ItemCompra>>(){}.getType());
  }




}

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    try {
      cl = ccl.loadClass(klass);
    } catch (ClassNotFoundException e) {
      log.warn("Error while loading class", e);
    }
    return (Vector) gson.fromJson(vector, cl);
  }


}

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    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(vectorType, new JsonVectorAdapter());
    Gson gson = builder.create();
    String json = gson.toJson(test, vectorType);
    Vector test1 = gson.fromJson(json, vectorType);
    try {
      test1.get("Fee");
      fail();
    } catch (IndexException e) {
      fail();

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    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(vectorType, new JsonVectorAdapter());
    Gson gson = builder.create();
    String json = gson.toJson(test, vectorType);
    Vector test1 = gson.fromJson(json, vectorType);
    try {
      test1.get("Fee");
      fail();
    } catch (IndexException e) {
      fail();

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    try {
      cl = ccl.loadClass(klass);
    } catch (ClassNotFoundException e) {
      log.warn("Error while loading class", e);
    }
    return (Matrix) gson.fromJson(matrix, cl);
  }


}

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    }.getType();
    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(vectorType, new JsonVectorAdapter());
    builder.registerTypeAdapter(matrixType, new JsonMatrixAdapter());
    Gson gson = builder.create();
    return gson.fromJson(formatString, matrixType);
  }


  public String asFormatString() {
    Type vectorType = new TypeToken<Vector>() {
    }.getType();

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    assertEquals("format", "nm{n=0 m=[1.100, 2.200, 3.300] sd=0.75}", format);
    String json = model.asJsonString();
    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Model.class, new JsonModelAdapter());
    Gson gson = builder.create();
    NormalModel model2 = gson.fromJson(json, modelType);
    assertEquals("Json", format, model2.asFormatString(null));
  }


  public void testDirichletSampledNormalModel() {
    double[] d = { 1.1, 2.2, 3.3 };

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    assertEquals("format", "snm{n=0 m=[1.100, 2.200, 3.300] sd=0.75}", format);
    String json = model.asJsonString();
    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Model.class, new JsonModelAdapter());
    Gson gson = builder.create();
    SampledNormalModel model2 = gson.fromJson(json, modelType);
    assertEquals("Json", format, model2.asFormatString(null));
  }


  public void testDirichletASNormalModel() {
    double[] d = { 1.1, 2.2, 3.3 };

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    assertEquals("format", "asnm{n=0 m=[1.100, 2.200, 3.300] sd=[1.100, 2.200, 3.300]}", format);
    String json = model.asJsonString();
    GsonBuilder builder = new GsonBuilder();
    builder.registerTypeAdapter(Model.class, new JsonModelAdapter());
    Gson gson = builder.create();
    AsymmetricSampledNormalModel model2 = gson.fromJson(json, modelType);
    assertEquals("Json", format, model2.asFormatString(null));
  }


  public void testDirichletL1Model() {
    double[] d = { 1.1, 2.2, 3.3 };

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