使用Guice将参数传递给构造函数 [英] Pass parameter to constructor with Guice

问题描述

我有一个工厂，如下所示，

I have a factory as below,

public final class Application {

    private static IFoo foo;

    public static IFoo getFoo(String bar)
    {
            // i need to inject bar to the constructor of Foo
            // obvious i have to do something, not sure what
        Injector injector = Guice.createInjector();
        logger = injector.getInstance(Foo.class);
        return logger;              
    }

}

这是Foo的定义：

class Foo
{
   Foo(String bar)
   {

   }

}

好的。我不确定如何使用Guice将此参数传递给Foo构造函数？

OK. I m not sure how I can pass this parameter to Foo constructor with Guice?

任何想法？

推荐答案

所有Guice构造函数参数的答案在某种程度上似乎都是不完整的。
这是一个完整的解决方案，包括用法：

All the "Guice Constructor Parameter" answers seem to be incomplete in some way. Here is a complete solution, including usage:

interface FooInterface{
  String getFooName();
}

//在实现类上注释构造函数和辅助参数

// Annotate the constructor and assisted parameters on the implementation class

class Foo implements FooInterface {
   String bar;

   @Inject
   Foo(@Assisted String bar)
   {
      this.bar = bar;
   }

   // return the final name
   getFooName(){
     return this.bar;
   }

}

//创建工厂界面一个create（）方法，只接受辅助参数。
// FooFactory接口没有显式的实现类（Guice Magic）

// Create a factory interface with a create() method that takes only the assisted parameters. // FooFactory interface doesn't have an explicit implementation class (Guice Magic)

interface FooFactory{
   Foo create(String bar);
}

//将该工厂绑定到由AssistedInject创建的提供商

// Bind that factory to a provider created by AssistedInject

binderModule implements Module{

 void configure(Binder binder) {
   binder.install(new FactoryModuleBuilder()
         .implement(FooInterface.class, Foo.class)
         .build(FooFactory.class));
 }
}

//现在使用它：

class FooAction{

   @Inject private FooFactory fooFactory;

   doFoo(){
      // Send bar details through the Factory, not the "injector" 
      Foo f = fooFactory.create("This foo is named bar. How lovely!");
      f.getFooName(); // "This foo is named bar. How lovely!"
   }
}

这里有很多帮助： https://google.github.io /guice/api-docs/latest/javadoc/index.html?com/google/inject/assistedinject/FactoryModuleBuilder.html

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