@Autowired设置默认值

回答: @Autowired注解的默认值是required=true，即默认情况下，如果没有匹配到对应的类，会报错。\[2\]如果想要设置默认值为false，可以在@Autowired注解上添加required=false的属性值。这样，在没有匹配到对应的类时，不会报错，而是会将该属性设置为null。\[2\]
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