# gulimall

**Repository Path**: daodai321/gulimall

## Basic Information

- **Project Name**: gulimall
- **Description**: 谷粒商城
- **Primary Language**: Java
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2022-09-27
- **Last Updated**: 2023-08-09

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

1.参数校验
+ 新建不同接口作为校验规则的标记 `AddGroup` `UpdateGroup`
+ 根据业务在实体类上做标记
    ```java
    @NotBlank(message = "新增时品牌地址不能为空",groups = {AddGroup.class})
    @URL(message = "logo地址必须是一个合法的url地址",groups = {AddGroup.class,UpdateGroup.class})
    private String logo;
    ```
+  在方法参数上添加注解`@Validated`并指明校验参数使用的组别 
    ```java
        @RequestMapping("/update")
        public R update(@Validated(UpdateGroup.class) @RequestBody BrandEntity brand){
            brandService.updateById(brand);
            return R.ok();
        }
    ```
   
2.自定义校验注解
+ 新建自定义注解
    ```java
    @Documented
    @Constraint(validatedBy = {ListValuesConstraintValidator.class}) // ListValuesConstraintValidator作为该注解的校验器
    @Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
    @Retention(RetentionPolicy.RUNTIME)
    public @interface ListValues {
        
        // com.atguigu.common.valid.ListValues.message参考ValidationMessage.properties，在resources下新建ValidationMessage.properties
        String message() default "{com.atguigu.common.valid.ListValues.message}";
    
        Class<?>[] groups() default {};
    
        Class<? extends Payload>[] payload() default {};
    
        int[] vals() default {}; // 自定义的属性
    }
    ```
+ 新建自定义注解对应的校验器
    ```java
        // ConstraintValidator<ListValues, Integer>中ListValues为校验注解,
        // Integer为该校验注解校验的参数数据类型
        public class ListValuesConstraintValidator implements ConstraintValidator<ListValues, Integer> {

        Set set = new HashSet<Integer>();
    
        @Override
        public void initialize(ListValues constraintAnnotation) {
            int[] vals = constraintAnnotation.vals();
            for (int val : vals) {
                set.add(val);
            }
        }
    
        @Override
        public boolean isValid(Integer integer, ConstraintValidatorContext constraintValidatorContext) {
            return set.contains(integer);
        }
    }
    ```
  
> springCache的使用