弹簧自动装配器/构造器的优点和缺点 [英] Spring autowiring setter/constructor PROs and CONs

问题描述

使用@Autowired(不是xml配置)时，有人可以比较set/constructor绑定的优点和缺点吗?

When using @Autowired (not xml configuration), could someone compare the set/constructor binding advantages and disadvantages?

请参阅以下示例:

public class Example{
   private Logger log;
   // constructor wiring
   @Autowired 
   public Example(Logger log){
      this.log = log;
   }
}

public class Example{
   // setter wiring
   @Autowired 
   private Logger log;
}

推荐答案

这完全是优先事项.

在构造函数注入时，Spring会皱眉，或者至少是不习惯的，因为这样会出现循环依赖关系，并且难以管理(A在构造函数中需要B，B在构造函数中需要A).

Spring frowns upon constructor injection, or at least used to, because thus circular dependencies appear and they are hard to manage (A needs B in constructor, B needs A in constructor).

一个实际的区别是，在字段上使用@Autowired时，您不需要setter方法，该方法一方面使类更小且更易于阅读，但另一方面使类的模仿变得更丑陋

One actual difference is that with @Autowired on a field you don't need a setter method, which, on one hand makes the class smaller and easier to read, but on the other hand makes mocking the class a bit uglier.

我更喜欢现场注入.

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