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### 26.1.3. MessageCodesResolver
Spring MVC有一个策略，用于从绑定的errors产生用来渲染错误信息的错误码：MessageCodesResolver。如果设置`spring.mvc.message-codes-resolver.format`属性为`PREFIX_ERROR_CODE`或`POSTFIX_ERROR_CODE`（具体查看`DefaultMessageCodesResolver.Format`枚举值），Spring Boot会为你创建一个MessageCodesResolver。