根据JSR303注解的规范,必须包含String message() Class>[] groups() Class extends Payload>[] payload()
@ListValue的作用是只能接收在数组的值
import static java.lang.annotation.ElementType.*; import static java.lang.annotation.ElementType.TYPE_USE; import static java.lang.annotation.RetentionPolicy.RUNTIME; @documented @Constraint(validatedBy = { ListValueConstrainValidator.class}) //可以指定多个不同的校验器,适配不同的数据类型 @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE }) @Retention(RUNTIME) public @interface ListValue { // 在ValidationMessages.properties文件中的字段 String message() default "{com.atguigu.common.valid.ListValue.message}"; Class>[] groups() default { }; Class extends Payload>[] payload() default { }; int[] vals() default {}; }
通过@Constraint 与自己编写的校验器相关联,可以指定多个不同的校验器,适配不同的数据类型
2. 编写自定义校验器实现 ConstraintValidator
import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; import java.util.HashSet; import java.util.Set; public class ListValueConstrainValidator implements ConstraintValidator3. 编写集中处理异常类{ private Set set =new HashSet<>(); //初始化方法 @Override public void initialize(ListValue constraintAnnotation) { int[] vals = constraintAnnotation.vals(); for (int val : vals) { set.add(val); } } // 判断是否校验成功 @Override public boolean isValid(Integer value, ConstraintValidatorContext context) { return set.contains(value); } }
import com.atguigu.common.exception.BizCodeEnum; import com.atguigu.common.utils.R; import lombok.extern.slf4j.Slf4j; import org.springframework.validation.BindingResult; import org.springframework.web.bind.MethodArgumentNotValidException; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestControllerAdvice; import java.util.HashMap; import java.util.Map; @Slf4j @RestControllerAdvice(basePackages = "com.atguigu.gulimall.product.controller") public class GulimallExceptionControllerAdvice { @ExceptionHandler(value = MethodArgumentNotValidException.class) public R handlevalidException(MethodArgumentNotValidException e) { log.error("数据校验出现问题{},异常类型:{}", e.getMessage(), e.getClass()); BindingResult bindingResult = e.getBindingResult(); MaperrorMap = new HashMap<>(); bindingResult.getFieldErrors().forEach((fieldError -> { errorMap.put(fieldError.getField(), fieldError.getDefaultMessage()); })); return R.error(BizCodeEnum.VALID_EXCEPTION.getCode(), BizCodeEnum.VALID_EXCEPTION.getMsg()).put("data", errorMap); } @ExceptionHandler(value = Throwable.class) public R HandleException(Throwable throwable){ log.error("错误:",throwable); return R.error(BizCodeEnum.UNKNOW_EXCEPTION.getCode(),BizCodeEnum.UNKNOW_EXCEPTION.getMsg()); } }
@Slf4j是Lombok插件的注解, BizCodeEnum 是一个自定义的错误类型枚举类
4. 使用自定义校验注解 4.1 在实体类的属性上添加@ValueList@ListValue(vals={0,1}, groups = {AddGroup.class, UpdateGroup.class}) private Integer showStatus;
groups 选择校验的组, AddGroupt和UpdateGroup是自定义的空接口
4.2 校验Controller方法的参数使用我们自定义的注解来校验Controller类接收的实体类的值
import java.util.Arrays; import java.util.HashMap; import java.util.Map; import com.atguigu.common.valid.AddGroup; import com.atguigu.common.valid.UpdateGroup; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.validation.BindingResult; import org.springframework.validation.annotation.Validated; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import com.atguigu.gulimall.product.entity.BrandEntity; import com.atguigu.gulimall.product.service.BrandService; import com.atguigu.common.utils.PageUtils; import com.atguigu.common.utils.R; import javax.validation.Valid; @RestController @RequestMapping("product/brand") public class BrandController { @Autowired private BrandService brandService; @RequestMapping("/save") // @RequiresPermissions("product:brand:save") public R save(@Validated({AddGroup.class}) @RequestBody BrandEntity brand){ brandService.save(brand); return R.ok(); } }
@Valid不需要指定使用校验的组,全部校验注解都生效
@Validated在后面指定要使用校验的组,如果在实体类中的属性的校验注解不带对应的groups参数的话,则不会使用这个校验注解
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