使用Autobean解析JSON数组

Question

我有一个JSON，我想用紫豆解析它。我在for循环中得到了NullPointerException，可能是persons.getPersons()

AppAutoBeanFactory factory = GWT.create(AppAutoBeanFactory.class);
    AutoBean<PersonsWrapper> bean =AutoBeanCodex.decode(factory, PersonsWrapper.class, "{\"persons\": " + strResponse + "}");
    IPersons persons = bean.as().getPersons();


        for (IPerson person : persons.getPersons()) {
            ...
        }

我的AppAutoBeanFactory看起来是这样的：

 interface AppAutoBeanFactory extends AutoBeanFactory {

   AutoBean<IPerson> person();
   AutoBean<IPersons> ipersons();
   AutoBean<PersonsWrapper> persons();


}

JSON (变量strResponse)如下所示：

[
  {
    "name":"John",
    "surname":"Blue",
    "records":[10.5, 12.5, 18.6]
  },
  {
    "name":"Steven",
    "surname":"Green",
    "records":[11.5, 15.5, 14.6]
   }
]

我制作了这些接口：

public interface PersonsWrapper {
 IPersons getPersons();
}

public interface IPersons {

    void setPersons(List<IPerson> persons);
    List<IPerson> getPersons();

}

public interface IPerson {

  String getName();
  void setName(String name); 
  String getSurname();
  void setSurname(String surname);
}

我怎么才能让它起作用？以及如何将记录数组添加到IPerson？

Answer 1

按照您的做法，您期望JSON具有{"persons:{"persons":[…]}}：外部对象是一个PersonsWrapper，其persons属性是IPersons，其persons属性是List<IPerson>。

尝试放弃PersonsWrapper，而只使用IPersons：

IPersons bean =AutoBeanCodex.decode(factory, IPersons.class, "{\"persons\": " + strResponse + "}").as();

for (IPerson person : bean.getPersons()) {
    ...
}