原文地址:https://code.google.com/p/google-guice/wiki/ProviderBindings
ProviderBindings(提供者绑定):就是实现Provider接口来生产依赖的对象。
贴代码:
public interface Animal { void say(); } public class Cat implements Animal { String name; public void setName(String name) { this.name = name; } @Override public void say() { System.out.println("i am a cat"); } @Override public String toString() { return "name==>" + this.name; } } import com.google.inject.AbstractModule; public class AnimalModule extends AbstractModule { @Override protected void configure() { bind(String.class).toInstance("Tom"); bind(Animal.class).toProvider(AnimalProvider.class); System.out.println("run configure"); } } import com.google.inject.Inject; import com.google.inject.Provider; public class AnimalProvider implements Provider<Animal>{ String name; @Inject public AnimalProvider(String name) { this.name = name; } public Animal get() { Cat cat = new Cat(); cat.setName(name); System.out.println("run Provider.get()"); return cat; } } import com.google.inject.Guice; import com.google.inject.Injector; public class Test { public static void main(String[] args) { Injector injector = Guice.createInjector(new AnimalModule()); AnimalProvider provider = injector.getInstance(AnimalProvider.class); Animal cat = provider.get(); System.out.println(cat); cat.say(); } }
执行结果:
run AnimalModule.configure()
run Provider.get()
name==>Tom
i am a cat