案例1：

[java]?view plain?copy 
 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?"名稱不存在";??
 ??
 ????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;??
 ????????}??
 ??
 ????}??
 }??

[java]?view plain?copy 
 public?class?UserVo?{??
 ??
 ????@NotBlank(message?=?"[用戶名不能為空]")??
 ????@Length(max?=?64,?min?=?6,?message?=?"[用戶名]長度6~64")??
 ????@Name??
 ????private?String?username;??
 ??
 ????@NotBlank(message?=?"[密碼不能為空]")??
 ????@Length(max?=?64,?min?=?6,?message?=?"[密碼]長度6~64")??
 ????private?String?password;??
 ??
 ????@NotNull(message?=?"[出生日期不能為空]")??
 ????private?Date?birthDate;??
 }??

[java]?view plain?copy 
 @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);??
 ????}??
 }??

當username取值為"111111"時通過校驗，而當是其他值的時候，就會拋出校驗異常。

案例2?

[java]?view plain?copy 
 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是否屬于當前上下文租戶?
 ?*?注：當被校驗對象為空時，校驗為通過，所以如果需要校驗對象必填，請自行結合相關校驗注解?
 ?*?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?"用戶不存在或者不屬于當前組織";??
 ??
 ????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;??
 ????????????}??
 ????????}??
 ????}??
 }??

調用

package com.pactera.testing.platform;import java.lang.reflect.Field;import com.pactera.model.platform.authority.SysUser;
import com.pactera.model.validations.valUserName;public class TestVal {public static void main(String[] args) throws Exception{SysUser user=new SysUser();user.setUserCode("123");valid(user);System.exit(0);}
public static valUserName dv=null;//解析的入口public static void valid(Object object) throws Exception{//獲取object的類型Class<? extends Object> clazz=object.getClass();//獲取該類型聲明的成員Field[] fields=clazz.getDeclaredFields();//遍歷屬性for(Field field:fields){//對于private私有化的成員變量，通過setAccessible來修改器訪問權限field.setAccessible(true);System.out.println(field.getName());validate(field,object);//重新設置會私有權限field.setAccessible(false);}}public static void validate(Field field,Object object) throws Exception{String description;Object value;value=field.get(object);System.out.println(value);dv=field.getAnnotation(valUserName.class);System.out.println(	dv.message());}
}

3?ConstraintValidator

[java]?view plain?copy 
 public?interface?ConstraintValidator<A?extends?Annotation,?T>?{??
 ????????//?在驗證之前調用該方法??
 ????????void?initialize(A?constraintAnnotation);?????????????
 ????????//?驗證方法??返回false說明沒有通過校驗??value的類型T可以有多種類型時，如案例2寫多個校驗類??
 ????????boolean?isValid(T?value,?ConstraintValidatorContext?context);??
 }??

4 利用注解回寫值

方法1:把輸入進去的123修改成了777返回

import java.lang.reflect.Method;import com.pactera.model.platform.authority.SysUser;
import com.pactera.model.validations.valUserName;public class TestVal {public static void main(String[] args) throws Exception{SysUser user=new SysUser();user.setUserCode("123");valid(user);System.out.print("12345678765434567------"+user.getUserCode());//System.exit(0);}
public static valUserName dv=null;//解析的入口public static void valid(Object object) throws Exception{//獲取object的類型Class<? extends Object> clazz=object.getClass();//獲取該類型聲明的成員Field[] fields=clazz.getDeclaredFields();//遍歷屬性for(Field field:fields){//對于private私有化的成員變量，通過setAccessible來修改器訪問權限field.setAccessible(true);System.out.println(field.getName());validate(field,object,clazz);//重新設置會私有權限field.setAccessible(false);}}public static void validate(Field field,Object object,Class<? extends Object> clazz) throws Exception{try{String description;Object value;Class clazzzobj = object.getClass();//獲取對象的類型  value=field.get(object);System.out.println(value);dv=field.getAnnotation(valUserName.class);System.out.println(	dv.message());String fieldName=field.getName();PropertyDescriptor pd = new PropertyDescriptor(fieldName, clazz);  Method setMethod = pd.getWriteMethod();  field.set(object, "7777");//    String temp ="777";value.toString();// Long.parseLong(fieldValue);  //    setMethod.invoke(clazzzobj, String.valueOf(temp));}catch(NullPointerException exp){}}
}

方法2

PropertyDescriptor pd = new PropertyDescriptor(fieldName, clazz);Method setMethod = pd.getWriteMethod();Long temp = Long.parseLong(fieldValue);setMethod.invoke(bean, String.valueOf(temp));