[英]Strategy Pattern and Dependency Injection in Spring
I have an Strategy interface, that is implemented by StrategyA and StrategyB , both of them are defined as @Component 's and they have an @Autowired attribute as well, how can I do to obtain an instance of one of them based on an String value? 我有一个Strategy接口,由StrategyA和StrategyB实现,它们都被定义为@Component ,它们也有@Autowired属性,如何根据String获取其中一个的实例值?
This is my Controller's action, that should perform the strategy: 这是我的Controller的动作,它应该执行策略:
@RequestMapping("/blabla")
public void perform (@RequestParam String strategyName) {
Strategy strategy = (Strategy) /* Get the concrete Strategy based on strategyName */;
strategy.doStuff ();
}
Thanks! 谢谢!
You can look it up programmatically: 您可以通过编程方式查找:
private @Autowired BeanFactory beanFactory;
@RequestMapping("/blabla")
public void perform (@RequestParam String strategyName) {
Strategy strategy = beanFactory.getBean(strategyName, Strategy.class);
strategy.doStuff();
}
You could do it a fancier way using a custom WebArgumentResolver
, but that's a lot more trouble than it's worth. 你可以使用自定义的
WebArgumentResolver
以更好的方式做到这WebArgumentResolver
,但这比它的价值更麻烦。
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