请求参数验证(3)-自定义验证

一、在get方法上面加入自定义的注解

@OnlyOne(message="")
可以加message覆盖 default设置的信息

@OnlyOne()
    public String getAppId() {
        return appId;
    }

二、写自定义接口

@Target({ElementType.METHOD, ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = { OnlyOneValidator.class })
public @interface OnlyOne {
    String message() default  "appid is non-uniqueness ";   //必须的属性
    Class<?>[] groups() default {};  //必须的属性
    Class<? extends Payload>[] payload() default {}; //必须的属性
}

三、写验证接口的实现类

import com.lion.service.TokenService;
import org.springframework.beans.factory.annotation.Autowired;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * Created by Administrator on 2016/8/15.
 */
public class OnlyOneValidator implements ConstraintValidator<OnlyOne,String> {
    @Autowired
    TokenService tokenService;
    public void initialize(OnlyOne onlyOne) {

    }

    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {

        return tokenService.isDistinct(s);
    }
}