springmvc的注解验证是怎么加进去的

The main Bean Validation class. This is the core processing class of Hibernate Validator.

ValidatorImpl:validateConstraintsForDefaultGroup

ValidatorFactoryImpl(constraintHelper)
constraintHelper中添加了各种默认的验证器

public ValidatorFactoryImpl(ConfigurationState configurationState) {
		this.messageInterpolator = configurationState.getMessageInterpolator();
		this.traversableResolver = configurationState.getTraversableResolver();
		this.parameterNameProvider = configurationState.getParameterNameProvider();
		this.beanMetaDataManagerMap = Collections.synchronizedMap( new IdentityHashMap() );
		this.constraintHelper = new ConstraintHelper();
		this.typeResolutionHelper = new TypeResolutionHelper();
		this.executableHelper = new ExecutableHelper( typeResolutionHelper );

Constraint这个注解是很重要的 groups等两个方法也是必须

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@Constraint(validatedBy = { JSONValidator.class })
public @interface BeJSON {
	String message() default "{must.be.json.format}";

	public Class[] groups() default {};

	Class[] payload() default {};

}

继承ConstraintValidator

public class JSONValidator implements ConstraintValidator {

错误

but does not contain a groups parameter