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加入依赖

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

在实体类的属性中使用注解设置参数校验

@Data
@ApiModel(value="AddCourseDto", description="新增课程基本信息")
public class AddCourseDto {

 @NotEmpty(message = "课程名称不能为空")
 @ApiModelProperty(value = "课程名称", required = true)
 private String name;

 @NotEmpty(message = "适用人群不能为空")
 @Size(message = "适用人群内容过少",min = 10)
 @ApiModelProperty(value = "适用人群", required = true)
 private String users;

 @ApiModelProperty(value = "课程标签")
 private String tags;

 @NotEmpty(message = "课程分类不能为空")
 @ApiModelProperty(value = "大分类", required = true)
 private String mt;

 @NotEmpty(message = "课程分类不能为空")
 @ApiModelProperty(value = "小分类", required = true)
 private String st;

 @NotEmpty(message = "课程等级不能为空")
 @ApiModelProperty(value = "课程等级", required = true)
 private String grade;

 @ApiModelProperty(value = "教学模式（普通，录播，直播等）", required = true)
 private String teachmode;

 @ApiModelProperty(value = "课程介绍")
 @Size(message = "课程描述内容过少",min = 10)
 private String description;

 @ApiModelProperty(value = "课程图片", required = true)
 private String pic;

 @NotEmpty(message = "收费规则不能为空")
 @ApiModelProperty(value = "收费规则，对应数据字典", required = true)
 private String charge;

 @ApiModelProperty(value = "价格")
 private Float price;
 @ApiModelProperty(value = "原价")
 private Float originalPrice;


 @ApiModelProperty(value = "qq")
 private String qq;

 @ApiModelProperty(value = "微信")
 private String wechat;
 @ApiModelProperty(value = "电话")
 private String phone;

 @ApiModelProperty(value = "有效期")
 private Integer validDays;
}

在controller方法参数中使用 @Validated使校验生效

public CourseBaseInfoDto createCourseBase(@RequestBody @Validated AddCourseDto addCourseDto)

在全局异常中对JSR303错误信息解析

 //JSR303校验框架异常解析
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public RestErrorResponse  methodArgumentNotValidException(MethodArgumentNotValidException exception){

        BindingResult bindingResult = exception.getBindingResult();
        //存储错误信息
        List<String> errors = new ArrayList<>();
        bindingResult.getFieldErrors().stream().forEach(item->{
            errors.add(item.getDefaultMessage());
        });

        //将list中的错误信息拼接起来
        String errMessage = StringUtils.join(errors, ",");
        //记录异常日志
        log.error("JSR303参数验证异常{}",exception.getMessage(),errMessage);

        //解析出异常信息
        RestErrorResponse restErrorResponse = new RestErrorResponse(errMessage);
        return restErrorResponse;
    }

多个接口共用一个模型类：分组校验 定义一些常用组

/**
 * @version 1.0
 * @Author zhaozhixin
 * @Date 2023/4/17 23:49
 * @注释 用于分级校验，定义一些常用的组
 */
public class ValidationGroups {
    public interface Insert{};
    public interface Update{};
    public interface Delete{};
}

在模型类的属性的验证注解中增加groups属性：示例

 @NotEmpty(message = "课程名称不能为空",groups ={ValidationGroups.Insert.class} )
 @NotEmpty(message = "课程名称不能为空",groups ={ValidationGroups.Update.class} )
 @ApiModelProperty(value = "课程名称", required = true)
 private String name;

在接口的@Validated注解中指定是哪个组

@PostMapping("/course")public CourseBaseInfoDto createCourseBase(@RequestBody @Validated(ValidationGroups.Insert.class) AddCourseDto addCourseDto)