Guice系列之用户指南（五）

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

练习代码在这里