> For the complete documentation index, see [llms.txt](https://jack80342.gitbook.io/spring-boot/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jack80342.gitbook.io/spring-boot/iv.-spring-boot-features/27.-developing-web-applications/27.1.-the-spring-web-mvc-framework/27.1.4.-messagecodesresolver.md).

# 27.1.4. MessageCodesResolver

Spring MVC有一个实现策略，用于从绑定的errors产生用来渲染错误信息的错误码：`MessageCodesResolver`。只要设置`spring.mvc.message-codes-resolver.format`属性为`PREFIX_ERROR_CODE`或`POSTFIX_ERROR_CODE`，Spring Boot会自动为你创建该实现（具体查看`DefaultMessageCodesResolver.Format`枚举值）。