@StaticMetamodel(UserInfo.class)
public class UserInfo_ {
  public static volatile SingularAttribute<UserInfo, Integer> userId;
  public static volatile SingularAttribute<UserInfo, String> name;
  public static volatile SingularAttribute<UserInfo, Integer> age;
  public static volatile SingularAttribute<UserInfo, Long> high;
}

public class UserInfoExtendDao {

 @PersistenceContext(unitName = "springJpa")
 EntityManager em;

 public List<UserInfo> getUserInfo(String name,int age,int high) {
   CriteriaBuilder cb = em.getCriteriaBuilder();
   CriteriaQuery<UserInfo> query = cb.createQuery(UserInfo.class);

   //from
   Root<UserInfo> root = query.from(UserInfo.class);

   //where
   Predicate p1 = null;
   if(name!=null) {
     Predicate p2 = cb.equal(root.get(UserInfo_.name),name);
     if(p1 != null) {
       p1 = cb.and(p1,p2);
     } else {
       p1 = p2;
     }
   }

   if(age!=0) {
     Predicate p2 = cb.equal(root.get(UserInfo_.age), age);
     if(p1 != null) {
       p1 = cb.and(p1,p2);
     } else {
       p1 = p2;
     }
   }

   if(high!=0) {
     Predicate p2 = cb.equal(root.get(UserInfo_.high), high);
     if(p1 != null) {
       p1 = cb.and(p1,p2);
     } else {
       p1 = p2;
     }
   }
   query.where(p1);

   List<UserInfo> userInfos = em.createQuery(query).getResultList();
   return userInfos;
 }
}

public interface JpaSpecificationExecutor<T> {
 T findOne(Specification<T> spec);
 List<T> findAll(Specification<T> spec);
 Page<T> findAll(Specification<T> spec, Pageable pageable);
 List<T> findAll(Specification<T> spec, Sort sort);
 long count(Specification<T> spec);
}

public interface UserInfoDao 
  extends PagingAndSortingRepository<UserInfo, String>, JpaSpecificationExecutor<UserInfo> {}

public static Specification<UserInfo> getSpec(final String name,final int age,final int high) {
   return new Specification<UserInfo>() {
     @Override
     public Predicate toPredicate(Root<UserInfo> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
       Predicate p1 = null;
       if(name!=null) {
         Predicate p2 = cb.equal(root.get(UserInfo_.name),name);
         if(p1 != null) {
           p1 = cb.and(p1,p2);
         } else {
           p1 = p2;
         }
       }

       if(age!=0) {
         Predicate p2 = cb.equal(root.get(UserInfo_.age), age);
         if(p1 != null) {
           p1 = cb.and(p1,p2);
         } else {
           p1 = p2;
         }
       }

       if(high!=0) {
         Predicate p2 = cb.equal(root.get(UserInfo_.high), high);
         if(p1 != null) {
           p1 = cb.and(p1,p2);
         } else {
           p1 = p2;
         }
       }

       return p1;
     }
   };
 }