Guice系列之用户指南（五）

发表于2013 年 10 月 22 日由考拉哥

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：

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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

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