春季战略模式与依赖注入

Question

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？

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 ();
}

谢谢!

Answer 1

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();
}

你可以使用自定义的方式做得更好WebArgumentResolver,但这比它的价值更麻烦.