javax 自定义注解校验 或者与hibernate联合使用

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（1）javax自定义注解使用

自定义一个注解

package com.macro.mall.demo.validator;import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;/*** 用户验证状态是否在指定范围内的注解*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD,ElementType.PARAMETER})
@Constraint(validatedBy = FlagValidatorClass.class)
public @interface FlagValidator {String[] value() default {};String message() default "flag is not found";Class<?>[] groups() default {};Class<? extends Payload>[] payload() default {};
}

package com.macro.mall.demo.validator;import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;/*** 状态标记校验器*/
public class FlagValidatorClass implements ConstraintValidator<FlagValidator,Integer> {private String[] values;@Overridepublic void initialize(FlagValidator flagValidator) {this.values = flagValidator.value();}@Overridepublic boolean isValid(Integer value, ConstraintValidatorContext constraintValidatorContext) {boolean isValid = false;for(int i=0;i<values.length;i++){if(values[i].equals(String.valueOf(value))){isValid = true;break;}}return isValid;}
}

package com.macro.mall.demo.dto;import com.macro.mall.demo.validator.FlagValidator;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;/*** 品牌传递参数*/
@ApiModel(value = "PmsBrandDto")
public class PmsBrandDto {@ApiModelProperty(value = "品牌名称",required = true)@NotNull(message = "名称不能为空")private String name;@ApiModelProperty(value = "品牌首字母",required = true)@NotNull(message = "首字母不能为空")private String firstLetter;@ApiModelProperty(value = "排序字段")@Min(value = 0, message = "排序最小为0")private Integer sort;@ApiModelProperty(value = "是否为厂家制造商")@FlagValidator(value = {"0","1"}, message = "厂家状态不正确")private Integer factoryStatus;@ApiModelProperty(value = "是否进行显示")@FlagValidator(value = {"0","1"}, message = "显示状态不正确")private Integer showStatus;@ApiModelProperty(value = "品牌logo")private String logo;@ApiModelProperty(value = "品牌大图")private String bigPic;@ApiModelProperty(value = "品牌故事")private String brandStory;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getFirstLetter() {return firstLetter;}public void setFirstLetter(String firstLetter) {this.firstLetter = firstLetter;}public Integer getSort() {return sort;}public void setSort(Integer sort) {this.sort = sort;}public Integer getFactoryStatus() {return factoryStatus;}public void setFactoryStatus(Integer factoryStatus) {this.factoryStatus = factoryStatus;}public Integer getShowStatus() {return showStatus;}public void setShowStatus(Integer showStatus) {this.showStatus = showStatus;}public String getLogo() {return logo;}public void setLogo(String logo) {this.logo = logo;}public String getBigPic() {return bigPic;}public void setBigPic(String bigPic) {this.bigPic = bigPic;}public String getBrandStory() {return brandStory;}public void setBrandStory(String brandStory) {this.brandStory = brandStory;}
}

这个类中，使用FlagValidator 这个注解 进行被校验然后使用最下面的那个文档进行统一注解的处理

也可以使用一个注解开启

import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;  @ApiOperation(value = "添加品牌")@RequestMapping(value = "/brand/create", method = RequestMethod.POST)@ResponseBodypublic CommonResult createBrand(@Validated @RequestBody PmsBrandDto pmsBrand) {CommonResult commonResult;int count = demoService.createBrand(pmsBrand);if (count == 1) {commonResult = CommonResult.success(pmsBrand);LOGGER.debug("createBrand success:{}", pmsBrand);} else {commonResult = CommonResult.failed("操作失败");LOGGER.debug("createBrand failed:{}", pmsBrand);}return commonResult;}

2021-09-27 11:10:51.909  WARN 67416 --- [nio-8082-exec-7] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public com.macro.mall.common.api.CommonResult com.macro.mall.demo.controller.DemoController.createBrand(com.macro.mall.demo.dto.PmsBrandDto): [Field error in object 'pmsBrandDto' on field 'showStatus': rejected value [10]; codes [FlagValidator.pmsBrandDto.showStatus,FlagValidator.showStatus,FlagValidator.java.lang.Integer,FlagValidator]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [pmsBrandDto.showStatus,showStatus]; arguments []; default message [showStatus],[Ljava.lang.String;@1f156699]; default message [显示状态不正确]] ]

因此需要统一捕获异常，统一返回response 可以使用

在valid校验中，如果校验不通过，会产生BindException异常，捕捉到异常后可以获取到defaultMessage也就是自定义注解中定义的内容，具体实现如下：

    BindException ex = (BindException)e;List<ObjectError> errors = ex.getAllErrors();ObjectError error = errors.get(0);String msg = error.getDefaultMessage();

其它的注解比如 Min，NotNULL。都可以直接引入hibernate进行校验，可以参考以前的一篇文章

使用javax的validation和hibernate-validator框架对pojo类的属性进行校验以及扩展_红豆和绿豆的博客-CSDN博客

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