用杜松子酒进行场水平注入 [英] Field level injection with Gin

问题描述

我正在尝试进行字段级注入，因此在实例化控制器时不必传递模型，例如

I'm trying to do field-level injection so I don't have to pass "models" when my controllers are instantiated, like,

UserController controller = new UserController(/*No need to pass models here*/);

但是我的应用程序抛出NullPointerException，这里是我的代码：

However my application throws NullPointerException, here my code:

UserController.java

    public class UserController implements Controller {
        @Inject private UserModel model;
        public UserController() {
          model.doSomething(); // NullPointerException
        }
    }

ClientGinModule.java

public class ClientGinModule extends AbstractGinModule {
    @Override
    protected void configure() {
        bind(UserModel.class).in(Singleton.class);
    }
}

可能是什么问题？

推荐答案

在Guice中使用

UserController controller = injector.getInstance(UserController.class);

在杜松子酒中使用：

// Declare a method returning a UserController on your interface extending Ginjector
public UserController getUserController();

// When you need the controller, just call:
injector.getUserController();

以获得完全注入的控制器。

to get a fully-injected controller.

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