Spring 中互为别名的作用是啥?@AliasFor - V2EX
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sun1992

Spring 中互为别名的作用是啥?@AliasFor

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  •   sun1992 Jan 3, 2019 4757 views
    This topic created in 2710 days ago, the information mentioned may be changed or developed.

    比如注解 AliasFor 中 value 和 attribute 互为别名,这样设置的好处是啥?真的有更方便使用吗?

    因为觉得存在即合理,所以想知道这样做的意义是啥。希望各位大佬能答疑解惑~

    @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.METHOD}) @Documented public @interface AliasFor { @AliasFor("attribute") String value() default ""; @AliasFor("value") String attribute() default ""; Class<? extends Annotation> annotation() default Annotation.class; } 
    6 replies    2019-01-04 09:51:39 +08:00
    werty
        1
    werty  
       Jan 3, 2019
    Java 注解必须要有 value 吧, 但 value 又不能体现出值的实际含义, 所以就互相别名呗
    jakes
        2
    jakes  
       Jan 3, 2019
    @Anno("test") 相当于 @Anno(value="test")

    互为别名一般是用于将 attribute 设为注解的默认属性吧?这是我的理解,看看楼下怎么说。
    sun1992
        3
    sun1992  
    OP
       Jan 3, 2019
    @werty “ Java 注解必须要有 value ” ,没有这个说法吧,没有 value 也是可以正常运行的
    sun1992
        4
    sun1992  
    OP
       Jan 3, 2019
    @jakes 嗯 你这个有一定道理,简写的确方便一点。还有其他好处吗?
    chendy
        5
    chendy  
       Jan 3, 2019
    都已经翻到源码了,那就往上看一眼,注释里说的很清楚了…
    werty
        6
    werty  
       Jan 4, 2019
    @sun1992 我没说清楚, 使用 @TestAnnotation("xxxx") 这种方式的时候, 必须要有名为 value 的 method, 所以俩互为别名, 一个负责方便一个负责体现实际含义
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