自定义注解与validation结合使用案例

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;

import org.springframework.data.mongodb.core.mapping.Document;

@Target({ ElementType.FIELD, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Document
@Constraint(validatedBy = { Name.NameChecker.class })
public @interface Name {
	String message() default "名称不存在";

	Class<?>[]groups() default {};

	Class<? extends Payload>[]payload() default {};

	public static class NameChecker implements ConstraintValidator<Name, String> {

		@Override
		public void initialize(Name constraintAnnotation) {

		}

		@Override
		public boolean isValid(String value, ConstraintValidatorContext context) {
			if ("111111".equals(value)) {
				return true;
			}
			return false;
		}

	}
}

public class UserVo {

    @NotBlank(message = "[用户名不能为空]")
    @Length(max = 64, min = 6, message = "[用户名]长度6~64")
    @Name
    private String username;

    @NotBlank(message = "[密码不能为空]")
    @Length(max = 64, min = 6, message = "[密码]长度6~64")
    private String password;

    @NotNull(message = "[出生日期不能为空]")
    private Date birthDate;
}

@RestController
@RequestMapping("/v0.1/users")
public class UserController {

    @Autowired
    private UserRecordService service;

    @RequestMapping(method = RequestMethod.POST)
    public UserRecord add(@RequestBody @Valid UserVo vo) {
        UserRecord user = new UserRecord();
        BeanUtils.copyProperties(vo, user);
        return service.add(user);
    }

    @RequestMapping(method = RequestMethod.GET)
    public Items<UserRecord> list(ListParam<UserRecord> listParam){
        return service.list(listParam);
    }
}

当username取值为"111111"时通过校验，而当是其他值的时候，就会抛出校验异常。

package com.nd.social.common.validation;

import com.nd.gaea.WafException;
import com.nd.gaea.client.WafResourceAccessException;
import com.nd.social.common.util.UCHelper;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.client.ResourceAccessException;

import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;
import java.lang.annotation.*;

/**
 * uid是否属于当前上下文租户
 * 注：当被校验对象为空时，校验为通过，所以如果需要校验对象必填，请自行结合相关校验注解
 * Created by Zhang JinLong(150429) on 2016-09-18.
 */
@Target({ElementType.FIELD, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = {SameTenant.StringChecker.class, SameTenant.LongChecker.class})
@Documented
public @interface SameTenant {

    String message() default "用户不存在或者不属于当前组织";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};

    class StringChecker implements ConstraintValidator<SameTenant, String> {

        @Override
        public void initialize(SameTenant arg0) {
        }

        @Override
        public boolean isValid(String uid, ConstraintValidatorContext context) {
            if (StringUtils.isBlank(uid)) {
                return true;
            }
            try {
                return UCHelper.isSameTenant(uid);
            } catch (WafResourceAccessException | WafException | ResourceAccessException e) {
                return false;
            }
        }
    }

    class LongChecker implements ConstraintValidator<SameTenant, Long> {

        @Override
        public void initialize(SameTenant arg0) {
        }

        @Override
        public boolean isValid(Long uid, ConstraintValidatorContext context) {
            if (null == uid) {
                return true;
            }
            try {
                return UCHelper.isSameTenant(uid.toString());
            } catch (WafResourceAccessException | WafException | ResourceAccessException e) {
                return false;
            }
        }
    }
}

public interface ConstraintValidator<A extends Annotation, T> {
        // 在验证之前调用该方法
        void initialize(A constraintAnnotation);           
        // 验证方法  返回false说明没有通过校验  value的类型T可以有多种类型时，如案例2写多个校验类
        boolean isValid(T value, ConstraintValidatorContext context);
}