Java Guice 注入泛型类型
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Guice injecting Generic type
提问by petomalina
I'am trying to Inject generic type with Guice. I have Repository< T > which is located in the Cursor class.
我正在尝试使用 Guice 注入泛型类型。我有位于 Cursor 类中的 Repository< T > 。
public class Cursor<T> {
@Inject
protected Repository<T> repository;
So when I create Cursor< User >, I also want the Guice to inject my repository to Repository< User >. Is there a way to do this?
因此，当我创建 Cursor<User> 时，我还希望 Guice 将我的存储库注入到 Repository<User>。有没有办法做到这一点？
采纳答案by gontard
You have to use a TypeLiteral:
你必须使用一个TypeLiteral：
import com.google.inject.AbstractModule;
import com.google.inject.TypeLiteral;
public class MyModule extends AbstractModule {
@Override
protected void configure() {
bind(new TypeLiteral<Repository<User>>() {}).to(UserRepository.class);
}
}
To get an instance of Cursor<T>, an Injectoris required:
要获取 的实例Cursor<T>，Injector需要一个：
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
public class Main {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new MyModule());
Cursor<User> instance =
injector.getInstance(Key.get(new TypeLiteral<Cursor<User>>() {}));
System.err.println(instance.repository);
}
}
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