自定义常量注解@Desc

package com.zyq.annotation;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** 通用配置注解*/
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Desc {String value();String remark() default "";}

package com.zyq.util;import java.lang.reflect.Field;
import java.util.*;import com.zyq.annotation.Desc;
import com.zyq.entity.vo.DescAttr;/*** 常量注解工具类* * @author ZhangYuanqiang* @since 2021年4月14日*/
public class DescUtil {/*** 获取打了Desc注解类的字典属性列表* * @param cls_指定类* @return 字典属性列表*/public static  List getAttrList(Class cls) {try {Field[] fields = cls.getDeclaredFields();List attrList = new LinkedList<>();for (Field field : fields) {Desc desc = field.getAnnotation(Desc.class);if (desc != null) {DescAttr vo = new DescAttr();vo.setKey(field.getInt(cls));vo.setValue(desc.value());vo.setRemark(desc.remark());attrList.add(vo);}}return attrList;} catch (Exception e) {e.printStackTrace();}return Collections.emptyList();}/*** 获取某个属性值的Desc注解** @param cls_类* @param key_属性值* @return 注解*/private static  Desc getDesc(Class cls, int key) {Field[] fields = cls.getDeclaredFields();for (Field field : fields) {int i = 0;try {i = field.getInt(cls);} catch (Exception e) {e.printStackTrace();}if (i == key) {return field.getAnnotation(Desc.class);}}return null;}/*** 获取某个属性值的Desc注解的Value值** @param cls_类* @param key_属性值* @return 注解*/public static  String getValue(Class cls, int key) {Desc desc = DescUtil.getDesc(cls, key);if (desc != null) {return desc.value();}return "";}public static  boolean isContainKey(Class cls, int key) {return !Objects.isNull(DescUtil.getDesc(cls, key));}}

package com.zyq.entity.vo;import lombok.Data;/*** Desc 注解解析后的实体* * @author ZhangYuanqiang* @since 2021年4月14日*/
@Data
public class DescAttr {public int key;public String value;public String remark;}

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