Java Spring 里, @Autowire 注解写在方法上和变量属性上面有什么区别? - V2EX
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liky88
V2EX    Java

Java Spring 里, @Autowire 注解写在方法上和变量属性上面有什么区别?

  •  1
     
  •   liky88 Mar 16, 2016 5792 views
    This topic created in 3696 days ago, the information mentioned may be changed or developed.
    9 replies    2016-03-17 10:39:12 +08:00
    raysmond
        1
    raysmond  
       Mar 16, 2016
    写在变量上初始化地时候就要全部注入,这样有可能初始化时间较长。
    写在方法上,则是调用方法的时候才注入。

    不过写在变量上很方便
    liky88
        2
    liky88  
    OP
       Mar 16, 2016
    @raysmond
    写在变量上的时候,是实例化变量属性。
    那写在方法上的时候是实例化什么?
    saximoer
        3
    saximoer  
       Mar 16, 2016
    @liky88 他说的应该是 SET 方法上写?
    Ouyangan
        5
    Ouyangan  
       Mar 16, 2016
    额 ,我这里打不开,请参看 spring 文档 P59
    liky88
        7
    liky88  
    OP
       Mar 16, 2016
    @raysmond @Ouyangan
    我举个例子,你们看对不对.
    @Autowire
    public void setAuthentication(Authentication auth){
    ...
    }
    所以这个时候注解是放在方法上,是不是实例化 Authentication auth?

    跟在变量上注入是等价的?
    @Autowire
    Authentication auth;

    谢谢
    Ouyangan
        8
    Ouyangan  
       Mar 17, 2016
    @Autowire 注解在乘员变量可以直接省略 set 方法,两种达到的效果是相同的.
    specita
        9
    specita  
       Mar 17, 2016
    是等价的吧,两种写法而已
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