参数校验

1. 引入springvalidation依赖

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

2. 参数前添加@Pattern

   public Result registry(@Pattern(regexp = "^\\S{5,16}$") String username, @Pattern(regexp = "^\\S{5,16}$") String password) {}
   

3. 类上添加@Validated

   @Validated
   public class UserController {}
   

异常：jakarta.validation.ConstraintViolationException: registry.password: 需要匹配正则表达式"^\S{5,16}$", registry.username: 需要匹配正则表达式"^\S{5,16}$"

封装对象

对于封装的对象参数：

@PutMapping("/update")
public Result update(@RequestBody @Validated User user) {userService.update(user);return Result.success();
}

@Data
public class User {@NotNullprivate Integer id;private String username;@JsonIgnoreprivate String password;@NotEmpty@Pattern(regexp = "^//S{1,10}$")private String nickname;@NotEmpty@Emailprivate String email;private String user_pic;private LocalDateTime createTime;private LocalDateTime updateTime;
}

分组校验

多个接口对参数的要求不统一会导致混乱和错误

使用分组校验的方式：

@Data
public class Category {@NotNull(groups = Update.class)private Integer id;@NotEmpty(groups = {Add.class, Update.class})private String categoryName;@NotEmpty(groups = {Add.class, Update.class})private String categoryAlias;public interface Add{}public interface Update{}
}

public Result addCategory(@RequestBody @Validated(Category.Add.class) Category category){}
@PutMapping
public Result update(@RequestBody @Validated(Category.Update.class) Category category) {}

未指定的默认属于Default分组，也可以：

@Data
public class Category {@NotNull(groups = Update.class)private Integer id;@NotEmptyprivate String categoryName;@NotEmptyprivate String categoryAlias;public interface Add extend Default{}public interface Update extend Default{}
}

自定义参数校验

已有的注解不能满足校验要求，需要自定义注解

1. 首先定义自定义注解

   @Documented
   @Target({ElementType.FIELD})
   @Retention(RetentionPolicy.RUNTIME)
   // 指定校验规则
   @Constraint(validatedBy = {MyValidation.class}
   )
   public @interface Vali {// 校验失败后的提示信息String message() default "只能是“已发布”或者“草稿”";// 指定分组Class<?>[] groups() default {};// 获取附加信息Class<? extends Payload>[] payload() default {};
   }

2. 定义处理规则

   public class MyValidation implements ConstraintValidator<Vali, String> {@Overridepublic boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {// 提供校验规则return "已发布".equals(s) || "草稿".equals(s);}
   }
   

3. 使用方式和其他注解一致