Spring注解@Autowired如何工作? [英] How does Spring annotation @Autowired work?

问题描述

我遇到了@Autowired的示例:

public class EmpManager {
   @Autowired
   private EmpDao empDao;
}

我很好奇empDao如何获取设置，因为没有设置方法，而且它是私有的.

I was curious about how the empDao get sets since there are no setter methods and it is private.

推荐答案

Java允许通过编程简单问题.

Java allows access controls on a field or method to be turned off (yes, there's a security check to pass first) via the AccessibleObject.setAccessible() method which is part of the reflection framework (both Field and Method inherit from AccessibleObject). Once the field can be discovered and written to, it's pretty trivial to do the rest of it; merely a Simple Matter Of Programming.

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