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<dependency>

  <groupId>javax.validation</groupId>

  <artifactId>validation-api</artifactId>

  <version>1.1.0.Final</version>

</dependency>

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package com.shishang;

import javax.validation.constraints.*;

import java.io.Serializable;

import java.math.BigDecimal;

import java.util.Date;

public class Student implements Serializable {

  @NotNull(message = "名字不能为空")

  private String name;

  @Size(min = 6,max = 30,message = "地址应该在6-30字符之间")

  private String address;

  @DecimalMax(value = "100.00",message = "体重有些超标哦")

  @DecimalMin(value = "60.00",message = "多吃点饭吧")

  private BigDecimal weight;

  private String friendName;

  @AssertTrue

  private Boolean isHaveFriend(){

    return friendName != null?true:false;

  }

  @Future(message = "生日必须在当前实践之前")

  private Date birthday;

  @Pattern(regexp = "^(.+)@(.+)$",message = "邮箱的格式不合法")

  private String email;

  public String getName() {

    return name;

  }

  public void setName(String name) {

    this.name = name;

  }

  public String getAddress() {

    return address;

  }

  public void setAddress(String address) {

    this.address = address;

  }

  public BigDecimal getWeight() {

    return weight;

  }

  public void setWeight(BigDecimal weight) {

    this.weight = weight;

  }

  public String getFriendName() {

    return friendName;

  }

  public void setFriendName(String friendName) {

    this.friendName = friendName;

  }

  public Date getBirthday() {

    return birthday;

  }

  public void setBirthday(Date birthday) {

    this.birthday = birthday;

  }

  public String getEmail() {

    return email;

  }

  public void setEmail(String email) {

    this.email = email;

  }

}

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package com.use;

import javax.validation.ConstraintViolation;

import javax.validation.Validation;

import javax.validation.Validator;

import javax.validation.ValidatorFactory;

import java.io.Serializable;

import java.math.BigDecimal;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import java.util.Set;

public class StudentTest implements Serializable {

  public static void main(String[] args) {

    Student xiaoming = getBean();

    List<String> validate = validate(xiaoming);

    validate.forEach(row -> {

      System.out.println(row.toString());

    });

  }

  private static Student getBean() {

    Student bean = new Student();

    bean.setName(null);

    bean.setAddress("北京");

    bean.setBirthday(new Date());

    bean.setFriendName(null);

    bean.setWeight(new BigDecimal(30));

    bean.setEmail("xiaogangfan163.com");

    return bean;

  }

  private static ValidatorFactory factory = Validation.buildDefaultValidatorFactory();

  public static <T> List<String> validate(T t) {

    Validator validator = factory.getValidator();

    Set<ConstraintViolation<T>> constraintViolations = validator.validate(t);

    List<String> messageList = new ArrayList<>();

    for (ConstraintViolation<T> constraintViolation : constraintViolations) {

      messageList.add(constraintViolation.getMessage());

    }

    return messageList;

  }

}

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package com.defineconstrain;

/**

 * created by xiaogangfan

 * on 16/10/25.

 */

public enum CaseMode {

  UPPER,

  LOWER;

}

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package com.defineconstrain;

/**

 * created by xiaogangfan

 * on 16/10/25.

 */

import static java.lang.annotation.ElementType.*;

import static java.lang.annotation.RetentionPolicy.*;

import java.lang.annotation.Documented;

import java.lang.annotation.Retention;

import java.lang.annotation.Target;

import javax.validation.Constraint;

import javax.validation.Payload;

@Target( { METHOD, FIELD, ANNOTATION_TYPE })

@Retention(RUNTIME)

@Constraint(validatedBy = CheckCaseValidator.class)

@Documented

public @interface CheckCase {

  String message() default "{com.mycompany.constraints.checkcase}";

  Class<?>[] groups() default {};

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

  CaseMode value();

}

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package com.defineconstrain;

/**

 * created by xiaogangfan

 * on 16/10/25.

 */

import javax.validation.ConstraintValidator;

import javax.validation.ConstraintValidatorContext;

public class CheckCaseValidator implements ConstraintValidator<CheckCase, String> {

  private CaseMode caseMode;

  public void initialize(CheckCase constraintAnnotation) {

    this.caseMode = constraintAnnotation.value();

  }

  public boolean isValid(String object, ConstraintValidatorContext constraintContext) {

    if (object == null)

      return true;

    if (caseMode == CaseMode.UPPER)

      return object.equals(object.toUpperCase());

    else

      return object.equals(object.toLowerCase());

  }

}

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@CheckCase(value = CaseMode.LOWER,message = "名字的拼音需要小写")

private String spellName;

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bean.setSpellName("XIAOGANGFAN");