validation统一表单验证(含自定义枚举验证)

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一般我们对前端传输的参数做判断时,可能都是以以下方式进行判断,如果再加上字段的长度、正则等校验的话就会显得代码很累赘了。

// 新增/修改通用参数非空校验
if (StringUtil.isBlank(menu.getParentId())) 
  throw new LsException(ResultEnum.PARAM_MISSING_ERROR, "父级菜单ID不能为空!");

if (StringUtil.isBlank(menu.getMenuName())) 
  throw new LsException(ResultEnum.PARAM_MISSING_ERROR, "菜单名称不能为空!");

if (StringUtil.isBlank(menu.getMenuName())) 
  throw new LsException(ResultEnum.PARAM_MISSING_ERROR, "菜单类型不能为空!");

/**>>>>>>>>>>>>>>>>>>>>>>>>枚举类字段校验开始<<<<<<<<<<<<<<<<<<<<<<<<<**/
// 校验菜单类型是否存在
if (Objects.nonNull(model.getMenuType())) 
  MenuEnum.MenuType menuType = MenuEnum.MenuType.getByType(model.getMenuType());
  if (Objects.isNull(menuType)) 
    throw new LsException(ResultEnum.PARAM_CHECKED_ERROR, "此菜单类型不存在!");
  

// 校验打开方式是否存在
if (Objects.nonNull(model.getTarget())) 
  MenuEnum.Target target = MenuEnum.Target.getByTarget(model.getTarget());
  if (Objects.isNull(target)) 
    throw new LsException(ResultEnum.PARAM_CHECKED_ERROR, "此打开方式不存在!");
  

// 校验菜单状态是否存在
if (Objects.nonNull(model.getVisible())) 
  MenuEnum.Visible visible = MenuEnum.Visible.getByVisible(model.getVisible());
  if (Objects.isNull(visible)) 
    throw new LsException(ResultEnum.PARAM_CHECKED_ERROR, "此菜单状态不存在!");
  

/**>>>>>>>>>>>>>>>>>>>>>>>>枚举类字段校验结束<<<<<<<<<<<<<<<<<<<<<<<<<**/

 改进方案,使用Spring表单验证注解:

1、表单验证工具类ModelValidator

技术图片
/**
 * 软件版权:流沙~~
 * 修改日期   修改人员     修改说明
 * =========  ===========  =====================
 * 2019/9/30    liusha   新增
 * =========  ===========  =====================
 */
package com.sand.base.util.validator;

import com.sand.base.enums.CodeEnum;
import com.sand.base.exception.LsException;
import com.sand.base.util.lang3.StringUtil;
import com.sand.base.util.spring.SpringUtil;

import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * 功能说明:表单校验
 * 开发人员:@author liusha
 * 开发日期:2019/9/30 13:57
 * 功能描述:表单校验,验证非空、长度、正则等等
 */
public class ModelValidator 
  /**
   * 校验失败条数key值
   */
  public static final String CHECKED_FAIL_NUM = "checkedFailNum";
  /**
   * 校验失败原因key值
   */
  public static final String CHECKED_FAIL_MSG = "checkedFailNum";
  /**
   * 校验通过的数据列表key值
   */
  public static final String CHECKED_ENTITY_LIST = "checkedEntityList";

  /**
   * 表单验证(对应实体类配置注解)
   *
   * @param entity 校验对象
   * @param <T>
   */
  public static <T extends Object> void checkModel(T entity) 
    checkModel(entity, null);
  

  /**
   * 表单验证指定字段(对应实体类配置注解)
   *
   * @param entity 校验对象
   * @param <T>
   */
  public static <T extends Object> void checkModel(T entity, String fieldName) 
    Set<ConstraintViolation<T>> violationSet;
    if (StringUtil.isNotBlank(fieldName)) 
      violationSet = SpringUtil.getBean(Validator.class).validateProperty(entity, fieldName);
     else 
      violationSet = SpringUtil.getBean(Validator.class).validate(entity);
    
    if (violationSet.size() > 0) 
      String errorMsg = violationSet.iterator().next().getMessage();
      if (StringUtil.isBlank(errorMsg)) 
        errorMsg = "请求参数有误";
      
      throw new LsException(CodeEnum.PARAM_CHECKED_ERROR, errorMsg);
    
  

  /**
   * 批量表单验证(对应实体类配置注解)
   *
   * @param entityList 校验对象列表
   * @param <T>
   * @return 校验结果
   */
  public static <T extends Object> Map<String, Object> checkModelList(List<T> entityList) 
    Map<String, Object> checkedMap = new HashMap<>();
    // 校验通过的数据列表
    List<T> checkedEntityList = new ArrayList<>();
    // 校验失败原因
    StringBuilder checkedFailMsg = new StringBuilder();
    // 校验失败条数
    int checkedFailNum = 0;
    for (int i = 0; i < entityList.size(); i++) 
      try 
        checkModel(entityList.get(i));
       catch (Exception e) 
        checkedFailNum++;
        checkedFailMsg.append("第" + (i + 1) + "条数据:" + e.getMessage() + ";");
      
      checkedEntityList.add(entityList.get(i));
    
    checkedMap.put(CHECKED_FAIL_NUM, checkedFailNum);
    checkedMap.put(CHECKED_FAIL_MSG, checkedFailMsg);
    checkedMap.put(CHECKED_ENTITY_LIST, checkedEntityList);
    return checkedMap;
  
View Code

2、自定义枚举验证

1)、枚举注解@EnumValidAnnotation

技术图片
/**
 * 软件版权:流沙~~
 * 修改日期   修改人员     修改说明
 * =========  ===========  =====================
 * 2019/9/26    liusha   新增
 * =========  ===========  =====================
 */
package com.sand.base.annotation;

import com.sand.base.util.lang3.StringUtil;
import com.sand.base.util.validator.EnumValidator;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 功能说明:验证枚举类
 * 开发人员:@author liusha
 * 开发日期:2019/9/26 13:46
 * 功能描述:对表单中存在枚举类型的字段进行校验
 */
@Target(ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = EnumValidator.class)
@Documented
public @interface EnumValidAnnotation 
  /**
   * 提示消息
   *
   * @return
   */
  String message() default StringUtil.EMPTY;

  /**
   * 对应的枚举类
   *
   * @return
   */
  Class<?>[] target() default ;

  Class<?>[] groups() default ;

  Class<? extends Payload>[] payload() default ;
View Code

2)、枚举验证器EnumValidator

技术图片
/**
 * 软件版权:流沙~~
 * 修改日期   修改人员     修改说明
 * =========  ===========  =====================
 * 2019/9/26    liusha   新增
 * =========  ===========  =====================
 */
package com.sand.base.util.validator;

import com.sand.base.annotation.EnumValidAnnotation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.lang.reflect.Field;
import java.util.Objects;

/**
 * 功能说明:枚举验证器
 * 开发人员:@author liusha
 * 开发日期:2019/9/26 13:51
 * 功能描述:自定义枚举验证器
 */
public class EnumValidator implements ConstraintValidator<EnumValidAnnotation, String> 
  /**
   * 枚举类
   */
  Class<?>[] clzs;

  @Override
  public void initialize(EnumValidAnnotation constraintAnnotation) 
    clzs = constraintAnnotation.target();
  

  @Override
  public boolean isValid(String value, ConstraintValidatorContext context) 
    if (clzs.length > 0) 
      try 
        for (Class<?> clz : clzs) 
          if (clz.isEnum()) 
            // 枚举类验证
            Object[] objs = clz.getEnumConstants();
            for (Object obj : objs) 
              Class<?> enumClz = obj.getClass();
              Field[] fields = enumClz.getDeclaredFields();
              for (Field field : fields) 
                // 访问私有成员属性开关
                field.setAccessible(true);
                EnumValidAnnotation enumValidAnnotation = field.getAnnotation(EnumValidAnnotation.class);
                if (Objects.nonNull(enumValidAnnotation)) 
                  // 获取成员属性的值
                  Object enumValue = field.get(obj);
                  if (value.equals(enumValue.toString())) 
                    return true;
                  
                
              
            
          
        
       catch (IllegalAccessException e) 
        e.printStackTrace();
      
     else 
      return true;
    
    return false;
  
View Code

3)、枚举类中要转换的成员属性也需要添加@EnumValidAnnotation(主要是为了通用)

技术图片
/**
 * 软件版权:流沙~~
 * 修改日期   修改人员     修改说明
 * =========  ===========  =====================
 * 2019/8/28    liusha   新增
 * =========  ===========  =====================
 */
package com.sand.sys.enums;

import com.sand.base.annotation.EnumValidAnnotation;
import lombok.AllArgsConstructor;
import lombok.Getter;

import java.util.Objects;

/**
 * 功能说明:存放系统菜单枚举类
 * 开发人员:@author liusha
 * 开发日期:2019/8/28 19:48
 * 功能描述:使用@EnumValidAnnotation可用于表单校验,使用getBy*返回给客户端转译等
 */
public final class MenuEnum 
  @Getter
  @AllArgsConstructor
  public enum MenuType 
    // 菜单类型
    M("M", "目录"),
    C("C", "菜单"),
    F("F", "按钮");

    @EnumValidAnnotation
    private final String type;
    private final String description;

    public static MenuType getByType(String type) 
      for (MenuType item : MenuType.values()) 
        if (Objects.equals(type, item.getType())) 
          return item;
        
      
      return null;
    
  

  @Getter
  @AllArgsConstructor
  public enum Target 
    // 打开方式
    ITEM("_item", "页签中打开"),
    BLANK("_blank", "新窗口打开"),
    CURRENT("_current", "当前窗口打开");

    @EnumValidAnnotation
    private final String target;
    private final String description;

    public static Target getByTarget(String target) 
      for (Target item : Target.values()) 
        if (Objects.equals(target, item.getTarget())) 
          return item;
        
      
      return null;
    
  

  @Getter
  @AllArgsConstructor
  public enum Visible 
    // 菜单状态
    SHOW("0", "显示"),
    HIDE("1", "隐藏");

    @EnumValidAnnotation
    private final String visible;
    private final String description;

    public static Visible getByVisible(String visible) 
      for (Visible item : Visible.values()) 
        if (Objects.equals(visible, item.getVisible())) 
          return item;
        
      
      return null;
    
  
View Code

3、需要验证的实体类添加相应注解,@NotBlank、@Length以及自定义枚举注解@EnumValidAnnotation

技术图片
/**
 * 软件版权:流沙~~
 * 修改日期   修改人员     修改说明
 * =========  ===========  =====================
 * 2019/8/26    liusha   新增
 * =========  ===========  =====================
 */
package com.sand.sys.entity;

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.sand.base.annotation.EnumValidAnnotation;
import com.sand.base.constant.Constant;
import com.sand.base.core.entity.BaseEntity;
import com.sand.sys.enums.MenuEnum;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import lombok.experimental.Accessors;
import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.NotBlank;

/**
 * 功能说明:系统菜单
 * 开发人员:@author liusha
 * 开发日期:2019/8/26 13:38
 * 功能描述:系统菜单
 */
@Data
@Accessors(chain = true)
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = true)
@TableName(Constant.TABLE_PREFIX_SYS + "menu")
public class SysMenu extends BaseEntity 
  private static final long serialVersionUID = -2854114810573968874L;
  /**
   * 菜单ID
   */
  @TableId
  private String menuId;
  /**
   * 父菜单ID
   */
  @NotBlank(message = "[父级菜单ID]不能为空哟!")
  private String parentId;
  /**
   * 菜单名称
   */
  @NotBlank(message = "[菜单名称]不能为空哟!")
  @Length(max = 64, message = "[菜单名称]不能超过64个字符呢!")
  private String menuName;
  /**
   * 菜单类型(M目录 C菜单 F按钮)
   */
  @NotBlank(message = "[菜单类型]不能为空哟!")
  @EnumValidAnnotation(message = "[菜单类型]不存在!", target = MenuEnum.MenuType.class)
  private String menuType;
  /**
   * 菜单URL
   */
  @Length(max = 128, message = "[菜单URL]不能超过128个字符呢!")
  private String menuUrl;
  /**
   * 显示顺序
   */
  private int orderNum;
  /**
   * 打开方式(_item 页签中打开,_blank 新窗口打开,_current 当前窗口打开)
   */
  @EnumValidAnnotation(message = "[打开方式]不存在!", target = MenuEnum.Target.class)
  private String target;
  /**
   * 菜单状态(0显示 1隐藏)
   */
  @EnumValidAnnotation(message = "[菜单状态]不存在!", target = MenuEnum.Visible.class)
  private String visible;
  /**
   * 权限标识
   */
  @Length(max = 128, message = "[权限标识]不能超过128个字符呢!")
  private String purview;
  /**
   * 菜单图标
   */
  private String icon;

View Code

 4、如果需要使用表单验证,可以在对应的controller或者service上加上:

// 表单注解验证,非空,长度,正则等校验
ModelValidator.checkModel(model);

列举一些Spring表单验证常用的注解:

注解

适用的数据类型

说明

@AssertFalse

Boolean, boolean

验证注解的元素值是false

@AssertTrue

Boolean, boolean

验证注解的元素值是true

@DecimalMax(value=x)

BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.

验证注解的元素值小于等于@ DecimalMax指定的value值

@DecimalMin(value=x)

BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.

验证注解的元素值小于等于@ DecimalMin指定的value值

@Digits(integer=整数位数, fraction=小数位数)

BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.

验证注解的元素值的整数位数和小数位数上限

@Future

java.util.Date, java.util.Calendar; Additionally supported by HV, if theJoda Time date/time API is on the class path: any implementations ofReadablePartial andReadableInstant.

验证注解的元素值(日期类型)比当前时间晚

@Max(value=x)

BigDecimal, BigInteger, byte, short,int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type ofCharSequence (the numeric value represented by the character sequence is evaluated), any sub-type of Number.

验证注解的元素值小于等于@Max指定的value值

@Min(value=x)

BigDecimal, BigInteger, byte, short,int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of CharSequence (the numeric value represented by the char sequence is evaluated), any sub-type of Number.

验证注解的元素值大于等于@Min指定的value值

@NotNull

Any type

验证注解的元素值不是null

@Null

Any type

验证注解的元素值是null

@Past

java.util.Date, java.util.Calendar; Additionally supported by HV, if theJoda Time date/time API is on the class path: any implementations ofReadablePartial andReadableInstant.

验证注解的元素值(日期类型)比当前时间早

@Pattern(regex=正则表达式, flag=)

String. Additionally supported by HV: any sub-type of CharSequence.

验证注解的元素值与指定的正则表达式匹配

@Size(min=最小值, max=最大值)

String, Collection, Map and arrays. Additionally supported by HV: any sub-type of CharSequence.

验证注解的元素值的在min和max(包含)指定区间之内,如字符长度、集合大小

@Valid

Any non-primitive type(引用类型)

验证关联的对象,如账户对象里有一个订单对象,指定验证订单对象

@NotEmpty

CharSequence,CollectionMap and Arrays

验证注解的元素值不为null且不为空(字符串长度不为0、集合大小不为0)

@Range(min=最小值, max=最大值)

CharSequence, Collection, Map and Arrays,BigDecimal, BigInteger, CharSequence, byte, short, int, long and the respective wrappers of the primitive types

验证注解的元素值在最小值和最大值之间

@NotBlank

CharSequence

验证注解的元素值不为空(不为null、去除首位空格后长度为0),不同于@NotEmpty,@NotBlank只应用于字符串且在比较时会去除字符串的空格

@Length(min=下限, max=上限)

CharSequence

验证注解的元素值长度在min和max区间内

@Email

CharSequence

验证注解的元素值是Email,也可以通过正则表达式和flag指定自定义的email格式

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