Java使用自定義注解+反射實現(xiàn)字典轉(zhuǎn)換代碼實例

更新時間：2023年09月23日 08:28:42 作者：也曾眼眸有光

這篇文章主要介紹了Java使用自定義注解+反射實現(xiàn)字典轉(zhuǎn)換代碼實例,注解是一種能被添加到java代碼中的元數(shù)據(jù),類、方法、變量、參數(shù)和包都可以用注解來修飾,注解對于它所修飾的代碼并沒有直接的影響,需要的朋友可以參考下

一、自定義注解類

import java.lang.annotation.*;
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Dict {
    /**
     * 字典編碼
     */
    String dictName();
    /**
     * 實體類內(nèi)對應的中文字段名，默認為“當前字段+Text”
     * <p>
     * 例如當前字段為“type”，則對應中文字段默認為“typeText”
     */
    String dictField() default "";
}

二、AOP切面類

也可不使用切面，定義工具類進行處理

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Slf4j
@Aspect
@Component
public class DictAspect {
    @Pointcut("execution(* cn.stylefeng.guns.sys.modular.mapper.*.query*(..))") //指定mapper下所有查詢方法
    public void doPointcut() {
    }
    @AfterReturning(pointcut = "doPointcut()", returning = "result")
    public void doAfterReturning(JoinPoint pjp, Object result) {
        try {
            DictUtils.convertDict(result);
        } catch (Exception e) {
            log.error("查詢結(jié)果字典轉(zhuǎn)換失敗", e);
        }
    }
}

三、字典轉(zhuǎn)換工具類

package cn.hsa.powersi.hygeia.pcloud.DictConverUtils;
import cn.hsa.powersi.hygeia.pcloud.api.basic.iteminfo.Dict;
import cn.hsa.powersi.hygeia.pcloud.api.sys.dto.SysCodeTableDetailDTO;
import cn.hsa.powersi.hygeia.pcloud.basic.itemOwnType.dao.PhcItemTypeDAO;
import cn.hsa.powersi.hygeia.pcloud.basic.itemOwnType.entity.PhcItemTypeDO;
import cn.hsa.powersi.hygeia.pcloud.basic.storeseat.dao.PhcStoreSeatDAO;
import cn.hsa.powersi.hygeia.pcloud.basic.storeseat.entity.PhcStoreSeatDO;
import cn.hsa.powersi.hygeia.pcloud.com.base.dto.SelectDTO;
import cn.hsa.powersi.hygeia.pcloud.comm.bo.BasDictBO;
import cn.hsa.powersi.hygeia.pcloud.sys.bo.SysCodeTableDetailBO;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import lombok.Data;
import lombok.SneakyThrows;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.ClassUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.reflect.FieldUtils;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
 * @ClassName DictUtils
 * @Description  轉(zhuǎn)碼工具類  需要在DTO中使用注解進行轉(zhuǎn)碼
 * @Author 陳銳
 * @Date 2023/8/21 10:32
 * @Version 1.0
 */
@Component
public class DictUtils {
    private static  SysCodeTableDetailBO sysCodeTableDetailBO;
    @Resource
    public void setSysCodeTableDetailBO(SysCodeTableDetailBO sysCodeTableDetailBO) {
        DictUtils.sysCodeTableDetailBO = sysCodeTableDetailBO;
    }
    private static final String DICT_FIELD_SUFFIX = "Name";
    public static void convertDict(Object target) {
        if (target instanceof List) {
            List<?> objectList = ((List<?>) target);
            if (CollectionUtils.isNotEmpty(objectList)) {
                List<DictDefinition> dictDefinitions = getMetadata(objectList.get(0));
                if (CollectionUtils.isEmpty(dictDefinitions)) return;
                Map<String, Map<String, String>> dictMapMap = getCodeTable();
                objectList.forEach(t -> doConvertDict(t, dictDefinitions, dictMapMap));
            }
        } else {
            List<DictDefinition> dictDefinitions = getMetadata(target);
            if (CollectionUtils.isEmpty(dictDefinitions)) return;
            Map<String, Map<String, String>> dictMapMap = getCodeTable();
            doConvertDict(target, dictDefinitions, dictMapMap);
        }
    }
    /**
     * 僅獲取一次Dict元數(shù)據(jù)，降低多次反射造成的性能消耗
     * @param target 目標實體類
     * @return Dict元數(shù)據(jù)
     */
    private static List<DictDefinition> getMetadata(Object target) {
        List<DictDefinition> dictDefinitions = new ArrayList<>();
        if (ClassUtils.isPrimitiveOrWrapper(target.getClass())
                || target instanceof Map || target instanceof String) {
            return dictDefinitions;
        }
        List<Field> fields = FieldUtils.getAllFieldsList(target.getClass());
        for (Field field : fields) {
            Dict dict = AnnotationUtils.getAnnotation(field, Dict.class);
            if (dict != null) {
                DictDefinition dictDefinition = new DictDefinition();
                dictDefinition.setDict(dict);
                dictDefinition.setField(field);
                dictDefinitions.add(dictDefinition);
            }
        }
        return dictDefinitions;
    }
    @SneakyThrows
    private static void doConvertDict(Object target, List<DictDefinition> dictDefinitions,
                                      Map<String, Map<String, String>> dictMapMap) {
        for (DictDefinition dictDefinition : dictDefinitions) {
            Dict dict = dictDefinition.getDict();
            Field field = dictDefinition.getField();
            Map<String, String> dictMap = dictMapMap.get(dict.dictName());
            String dictCode = String.valueOf(FieldUtils.readField(target, field.getName(), true));
            String dictField = StringUtils.isEmpty(dict.dictField()) ? field.getName() + DICT_FIELD_SUFFIX : dict.dictField();
            FieldUtils.writeField(target, dictField, dictMap.get(dictCode), true);
        }
    }
    @Data
    public static class DictDefinition {
        private Dict dict;
        private Field field;
    }
    //獲取碼表
    public static Map<String, Map<String, String>> getCodeTable(List<String> shopIdList){
        ArrayList<String> codeTypeList = new ArrayList<>();
        return codeTypeMap;
    }
}

四、VO中使用注解確定需要字典轉(zhuǎn)換的字段

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class TestVo {
    private Integer id;
    private String name;
    private String idCard;
    /**
     * 性別(0、未知的性別 1、男性 2、女性)
     */
    @Dict(dictName = "sex")
    private String sex;
	//字典翻譯后的中文會賦值到該字段上面
    private String sexName;
}

到此這篇關于Java使用自定義注解+反射實現(xiàn)字典轉(zhuǎn)換代碼實例的文章就介紹到這了,更多相關自定義注解+反射實現(xiàn)字典轉(zhuǎn)換內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

您可能感興趣的文章: