一、@Validated 和@Valid有什么用

@Validation 和@Valid 常常配合使用对传输的参数进行数据校验的注解，并通过配置全局异常处理器进行合理化的提示，增加用户的体验

并且@Validated可以通过分组来指定什么时候触发什么样的参数校验（这里看一下就行，下面有说什么是分组）

二、为什么要使用@Validated 和@Valid的思考？

其实不用这两个注解也可以完成对传输的参数进校验，那样我们就需要一直写if语句进行判断 ，如果不为xxx，抛出异常，然后进行捕获处理  

但是当多处都用到的一样的传输参数的时候，我们每次都需要写一些重复的if进行校验，其实代码是不优雅的。因此有了这两个组件来帮我们进行传输参数的校验。

三、使用方法

3.1 引入pom

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--validator请求参数校验--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><!--测试方法--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId></dependency></dependencies>

3.2 写实体类加入一写校验注解

常用的校验注解

     

package com.sofwin.validator.domain;import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.config.Status;
import com.sofwin.validator.config.UpdateGroup;
import lombok.Data;
import org.hibernate.validator.constraints.Range;
import org.springframework.web.bind.annotation.Mapping;import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;
import java.util.List;/*** @packageName: com.sofwin.validator.domain* @author: wentao* @date: 2023/9/4 21:17* @version: 1.0* @email 1660420659@qq.com* @description: 测试*/
@Data
public class UserR {@NotBlank(message = "名称不能为空")private String name;@NotNull(message = "年龄不能为空")@Range(min = 1,max = 200,message ="最小为{min}岁，最大为{max}岁" )private Integer age;@Size(message ="编号长度为 [4-8] ", min = 4, max = 8)private String idNo;}

3.3 编写controller层进行测试 （请求参数是对象）

注意需要在请求参数的前面加上@Valid注解

统一返回类

package com.sofwin.validator.config;import lombok.Data;/*** @packageName: com.sofwin.validator.config* @author: wentao* @date: 2023/9/4 21:34* @version: 1.0* @email 1660420659@qq.com* @description: 统一返回参数*/
@Data
public  class  BaseResult<T> {private int code;private String message;private T data;public BaseResult() {}public BaseResult(int code, T data,String message) {this.code = code;this.message = message;this.data = data;}public static <T> BaseResult<T> build(int code, T data, String message) {return new BaseResult<T>(code,data,message);}public static <T> BaseResult<T> build( T data, BaseResult resultCodeEnum) {return new BaseResult<T>(resultCodeEnum.getCode(),data,resultCodeEnum.getMessage());}public static <T> BaseResult<T> ok(T data) {return new BaseResult<>(20000,data,"success");}public static <T> BaseResult<T> fail(T data) {return new BaseResult<>(50000,data,"error");}}

controller 

package com.sofwin.validator.controller;import com.sofwin.validator.config.BaseResult;
import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.domain.UserR;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;import javax.validation.Valid;
import javax.validation.constraints.NotNull;/*** @packageName: com.sofwin.validator.controller* @author: wentao* @date: 2023/9/4 21:14* @version: 1.0* @description: 请求参数校验*/@RestController
@RequestMapping("validator")
public class ValidatorController {@PostMapping("/validPost")public BaseResult validPostTest(@Valid @RequestBody UserR user ) {return BaseResult.ok(user);}}

正常参数

 

非正常参数 

我们发现没有提示我们在实体中message中写的提示信息，是因为我们没有设置全局异常处理器

，它只是在控制台返回了提示信息 

2023-09-05 21:24:03.305  WARN 20924 --- [nio-8080-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument [0] in public com.sofwin.validator.config.BaseResult com.sofwin.validator.controller.ValidatorController.validPostTest(com.sofwin.validator.domain.UserR): [Field error in object 'userR' on field 'age': rejected value [1111]; codes [Range.userR.age,Range.age,Range.java.lang.Integer,Range]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [userR.age,age]; arguments []; default message [age],200,1]; default message [最小为1岁，最大为200岁]] ]

全局异常处理器

package com.sofwin.validator.config;import lombok.extern.slf4j.Slf4j;
import org.slf4j.LoggerFactory;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import java.util.Set;
import org.slf4j.Logger;/*** @packageName: com.sofwin.validator.config* @author: wentao* @date: 2023/9/4 21:28* @version: 1.0* @email 1660420659@qq.com* @description: 全局异常处理器*/@RestControllerAdvice
@Slf4j
public class GlobExceptionHandeler {private final Logger logger = LoggerFactory.getLogger(getClass());//valid参数校验出现异常@ExceptionHandler(BindException.class)public BaseResult bindException(BindException e) {logger.error("valid参数校验出现异常");System.out.println(e);return BaseResult.build(441,null,e.getBindingResult().getAllErrors().get(0).getDefaultMessage());}//validated参数校验出现异常@ExceptionHandler(ConstraintViolationException.class)public BaseResult constraintViolationException(ConstraintViolationException e) {logger.error("validated参数校验出现异常");return BaseResult.build(441,null,e.getLocalizedMessage().split(":")[1].trim());}@ExceptionHandler(Exception.class)public BaseResult constraintViolationException(Exception e) {logger.error("Exception");return BaseResult.build(441,null,e.getLocalizedMessage());}
}

 加入全局异常处理器后非正常参数返回结果：

3.4 当参数不是一个对象

 一定要在controller上加入@Validated才生效

@RestController
@RequestMapping("validator")
@Validated
public class ValidatorController {@PostMapping("/validPost")public BaseResult validPostTest(@Valid @RequestBody UserR user ) {return BaseResult.ok(user);}@GetMapping("/validGet1")public BaseResult validGetTest( @NotBlank(message = "名字不能为空") String name ) {return BaseResult.ok(name);}
}

 

3.5 分组

当我们在特定情况下才进行参数校验才进行分组，例如只有当我们插入的时候我们进行校验，其他时候不进行参数的校验，这个时候就可以使用分组

实体类

package com.sofwin.validator.domain;import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.config.Status;
import com.sofwin.validator.config.UpdateGroup;
import lombok.Data;
import org.hibernate.validator.constraints.Range;
import org.springframework.web.bind.annotation.Mapping;import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;
import java.util.List;/*** @packageName: com.sofwin.validator.domain* @author: wentao* @date: 2023/9/4 21:17* @version: 1.0* @email 1660420659@qq.com* @description: 测试*/
@Data
public class UserR {@NotBlank(message = "名称不能为空")//进行分组@NotBlank(message = "名称不能为空(InsertGroup)",groups = InsertGroup.class)private String name;@NotNull(message = "年龄不能为空")@NotNull(message = "年龄不能为空(InsertGroup)",groups = {InsertGroup.class,UpdateGroup.class})@Range(min = 1,max = 200,message ="最小为{min}岁，最大为{max}岁" )private Integer age;@Size(message ="编号长度为 [4-8] ", min = 4, max = 8)private String idNo;}

其中InsertGroup和UpdateGroup只是一个普通的接口

public interface InsertGroup {}public interface UpdateGroup {}

 

controller

package com.sofwin.validator.controller;import com.sofwin.validator.config.BaseResult;
import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.domain.UserR;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;/*** @packageName: com.sofwin.validator.controller* @author: wentao* @date: 2023/9/4 21:14* @version: 1.0* @description: 请求参数校验*/@RestController
@RequestMapping("validator")
@Validated
public class ValidatorController {@PostMapping("/validPost")public BaseResult validPostTest(@Valid @RequestBody UserR user ) {return BaseResult.ok(user);}@PostMapping("/validPost2")public BaseResult validPostTest2(@Validated(InsertGroup.class) @RequestBody UserR user ) {return BaseResult.ok(user);}@GetMapping("/validGet1")public BaseResult validGetTest( @NotBlank(message = "名字不能为空") String name ) {return BaseResult.ok(name);}@GetMapping("/validGet2")public BaseResult validGetTest2(@Validated(InsertGroup.class) @NotNull(message = "名字不能为空") String name ) {return BaseResult.ok(name);}
}

测试

validPost2、validGet2

validPost2 

validGet2

3.6 自定义注解

当它提供的注解我们没有办法解决我们的问题的时候，我们就可以自定义注解

定义注解Status

package com.sofwin.validator.config;import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;/*** @packageName: com.sofwin.validator.config* @author: wentao* @date: 2023/9/4 21:52* @version: 1.0* @email 1660420659@qq.com* @description: 自定义校验注解*/
@Target({ElementType.FIELD,ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
//自己写校验规则
@Constraint(validatedBy = {StatusConstraint.class})
//元注解 可以分组使用，如果不写定义相同的注解会出现错误
@Repeatable(Status.List.class)
public @interface Status {String[] statusType() default {};String message() default "状态传递有误";Class<?>[] groups() default {};Class<? extends Payload>[] payload()  default {};@Target({ElementType.FIELD,ElementType.PARAMETER})@Retention(RetentionPolicy.RUNTIME)@Documented@interface List {Status[] value();}}

校验规则

package com.sofwin.validator.config;import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.List;/*** @packageName: com.sofwin.validator.config* @author: wentao* @date: 2023/9/4 22:04* @version: 1.0* @email 1660420659@qq.com* @description: 自定义校验柜子*/
public class StatusConstraint implements ConstraintValidator<Status,Integer> {List<String> statusType;/*** 一般进行初始化* @param constraintAnnotation*/@Overridepublic void initialize(Status constraintAnnotation) {String[] strings = constraintAnnotation.statusType();statusType = Arrays.asList(strings);}/**** @param value  参数的值* @param context* @return  true 通过不抛出异常  fasle不通过抛出异常*/@Overridepublic boolean isValid(Integer value, ConstraintValidatorContext context) {if (value !=null) {if (!statusType.contains(String.valueOf(value))) {return  false;}return  true;}return false;}
}

测试

实体类

package com.sofwin.validator.domain;import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.config.Status;
import com.sofwin.validator.config.UpdateGroup;
import lombok.Data;
import org.hibernate.validator.constraints.Range;
import org.springframework.web.bind.annotation.Mapping;import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;
import java.util.List;/*** @packageName: com.sofwin.validator.domain* @author: wentao* @date: 2023/9/4 21:17* @version: 1.0* @email 1660420659@qq.com* @description: 测试*/
@Data
public class UserR {@NotBlank(message = "名称不能为空")//进行分组@NotBlank(message = "名称不能为空(InsertGroup)",groups = InsertGroup.class)private String name;@NotNull(message = "年龄不能为空")@NotNull(message = "年龄不能为空(InsertGroup)",groups = {InsertGroup.class,UpdateGroup.class})@Range(min = 1,max = 200,message ="最小为{min}岁，最大为{max}岁" )private Integer age;@Status(statusType = {"1","2"})private Integer status;@Size(message ="编号长度为 [4-8] ", min = 4, max = 8)private String idNo;}

controller 

  @PostMapping("/validPost")public BaseResult validPostTest(@Valid @RequestBody UserR user ) {return BaseResult.ok(user);}

正常传参

非正常传参

 3.7 当出现类中出现嵌套的情况

当出现嵌套的情况只需要在类的属性中在加一个注解@Valid

实体类

package com.sofwin.validator.domain;import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.config.Status;
import com.sofwin.validator.config.UpdateGroup;
import lombok.Data;
import org.hibernate.validator.constraints.Range;
import org.springframework.web.bind.annotation.Mapping;import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;
import java.util.List;/*** @packageName: com.sofwin.validator.domain* @author: wentao* @date: 2023/9/4 21:17* @version: 1.0* @email 1660420659@qq.com* @description: 测试*/
@Data
public class UserR {@NotBlank(message = "名称不能为空")//进行分组@NotBlank(message = "名称不能为空(InsertGroup)",groups = InsertGroup.class)private String name;@NotNull(message = "年龄不能为空")@NotNull(message = "年龄不能为空(InsertGroup)",groups = {InsertGroup.class,UpdateGroup.class})@Range(min = 1,max = 200,message ="最小为{min}岁，最大为{max}岁" )private Integer age;@Status(statusType = {"1","2"})private Integer status;@Size(message ="编号长度为 [4-8] ", min = 4, max = 8)private String idNo;//嵌套使用valid才能生效@Validprivate List<SonUser> sonUserList;
}

package com.sofwin.validator.domain;import com.sofwin.validator.config.InsertGroup;
import com.sofwin.validator.config.UpdateGroup;
import lombok.Data;import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.math.BigDecimal;/*** @packageName: com.sofwin.validator.domain* @author: wentao* @date: 2023/9/4 21:17* @version: 1.0* @email 1660420659@qq.com* @description: 测试*/
@Data
public class SonUser {@NotBlank(message = "sonName不能为空")private String sonName;}

controller

  @PostMapping("/validPost")public BaseResult validPostTest(@Valid @RequestBody UserR user ) {return BaseResult.ok(user);}

四、 总结 

@Valid：没有分组的功能。

@Valid：可以用在方法、构造函数、方法参数和成员属性（字段）上

@Validated：提供了一个分组功能，可以在入参验证时，根据不同的分组采用不同的验证机制

@Validated：可以用在类型、方法和方法参数上。但是不能用在成员属性（字段）上

两者是否能用于成员属性（字段）上直接影响能否提供嵌套验证的功能