CategoryController

    @PutMappingpublic Result update(@RequestBody @Validated Category category){categoryService.update(category);return Result.success();}

 CategoryService

    //更新分类void update(Category category);

CategoryServiceImpl

    @Overridepublic void update(Category category) {category.setUpdateTime(LocalDateTime.now());categoryMapper.update(category);}

CategoryMapper

    //更新@Update("update category set category_name=#{categoryName},category_alias=#{categoryAlias},update_time=#{updateTime} where id = #{id}")void update(Category category);