java实体数据校验validation

    javax.validation
    validation-api
    1.1.0.Final


    org.hibernate
    hibernate-validator
    5.4.1.Final

// 实体
public class Entity{
    @NotNull(message = " name字段值不能为空")
    private String name;
    @Max(value = 20,message = "address最大长度为20")
    private String address;
    @NotNull
    @Size(max=10,min=5,message = "字段长度要在5-10之间")
    private String fileName;
    @Pattern(regexp = "^[a-zA-Z0-9_.-]+@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)*\\.[a-zA-Z0-9]{2,6}$",message = "不满足邮箱正则表达式")
    private String email;
    @AssertTrue(message = "字段为true才能通过")
    private boolean isSave;
    @Future(message = "时间在当前时间之后才可以通过")
    private Date date;
}

//  手动验证方法
public class ValidateHandler {
    private static Validator validator = Validation.buildDefaultValidatorFactory().getValidator();

    public static  ValidationResult validateEntity(T obj) {
        ValidationResult result = new ValidationResult();
        Set> set = validator.validate(obj, Default.class);
        result.setHasErrors(0);
        if (set != null && set.size() != 0) {
            result.setHasErrors(1);
            String strErrInfo="";
            for (ConstraintViolation cv : set) {
                strErrInfo += cv.getMessage() + "|";
            }
            result.setErrorInfo(strErrInfo);
        }
        return result;
    }

    public static  ValidationResult validateProperty(T obj, String propertyName) {
        ValidationResult result = new ValidationResult();
        Set> set = validator.validateProperty(obj, propertyName, Default.class);
        if (set != null && set.size() != 0) {
            result.setHasErrors(1);
            Map errorMsg = new HashMap();
            for (ConstraintViolation cv : set) {
                errorMsg.put(propertyName, cv.getMessage());
            }
            result.setErrorMsg(errorMsg);
        }
        return result;
    }
}



@Getter
@Setter
public class ValidationResult {
    // 校验结果是否有错
    private boolean  hasErrors;

    // 校验错误信息
    private Map errorMsg;
}

5、Validation 注解
* @Null：参数为null@NotNull：不能为null
* @NotBlank：字符串不能为null或者trim()后不能为空
* @NotEmpty：验证字符串或集合/数组不能为空
* @AssertFalse：必须是false
* @AssertTrue：必须是true
* @Pattern(regexp="") ：必须满足正则条件
* @Size(max = 18, min = 4)：验证字符串/数组/集合长度范围
* @Max：最大值上限
* @Min：最小值下限@DecimalMax("11.5")：传入字符串构建一个BigDecimal，规定值要小于这个值
* @DecimalMin：用来限制浮点数大小
* @Range(min=2, max=4)：检查数字是否在此范围
* @Past：限定日期必须是过去的日期
* @Future：限定日期必须是未来日期
* @Email：验证邮箱地址（示例：yoni123@136）
* @URL(protocol=,host=,port=,regexp=,flags=)：验证URL