import org.springframework.beans.BeanUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;

public class aaaaa extends BeanUtils{


    public static <S, T> T convertTo(S source, Supplier<T> targetSupplier) {
        return convertTo(source, targetSupplier, null);
    }

    /**
     * 轉換對象
     *
     * @param source         源對象
     * @param targetSupplier 目標對象供應方
     * @param callBack       回調方法
     * @param <S>            源對象類型
     * @param <T>            目標對象類型
     * @return 目標對象
     */
    public static <S, T> T convertTo(S source, Supplier<T> targetSupplier, ConvertCallBack<S, T> callBack) {
        if (null == source || null == targetSupplier) {
            return null;
        }

        T target = targetSupplier.get();
        BeanUtils.copyProperties(source, target);
        if (callBack != null) {
            callBack.callBack(source, target);
        }
        return target;
    }

    public static <S, T> List<T> convertListTo(List<S> sources, Supplier<T> targetSupplier) {
        return convertListTo(sources, targetSupplier, null);
    }

    /**
     * 轉換對象
     *
     * @param sources        源對象list
     * @param targetSupplier 目標對象供應方
     * @param callBack       回調方法
     * @param <S>            源對象類型
     * @param <T>            目標對象類型
     * @return 目標對象list
     */
    public static <S, T> List<T> convertListTo(List<S> sources, Supplier<T> targetSupplier, ConvertCallBack<S, T> callBack) {
        if (null == sources || null == targetSupplier) {
            return null;
        }

        List<T> list = new ArrayList<>(sources.size());
        for (S source : sources) {
            T target = targetSupplier.get();
            BeanUtils.copyProperties(source, target);
            if (callBack != null) {
                callBack.callBack(source, target);
            }
            list.add(target);
        }
        return list;
    }

    /**
     * 回調接口
     *
     * @param <S> 源對象類型
     * @param <T> 目標對象類型
     */
    @FunctionalInterface
    public interface ConvertCallBack<S, T> {
        void callBack(S t, T s);
    }
}

測試類

//EntAppealDTO和AppealInitateBO字段屬性一樣，自己隨意DIY吧。
 List<EntAppealDTO> entAppealDTO=new ArrayList<>();
        EntAppealDTO dto=new EntAppealDTO();
        dto.setAppealDate(new Date());
        List<EntAppealFilesDTO> entAppealFilesDTOList=new ArrayList<>();
        EntAppealFilesDTO filesDTO=new EntAppealFilesDTO();
        filesDTO.setFileId("123456");
        entAppealFilesDTOList.add(filesDTO);
        dto.setEntAppealFilesDTOList(entAppealFilesDTOList);
        entAppealDTO.add(dto);
        //通過lambda表達式特殊處理個別字段
        List<AppealInitateBO> initateBOList=aaaaa.convertListTo(entAppealDTO,AppealInitateBO::new,(s, t) -> t.setCityCode(s.getEntAppealFilesDTOList().get(0).getFileId()));
        //不帶單獨處理
        //List<AppealInitateBO> initateBOList=aaaaa.convertListTo(entAppealDTO,AppealInitateBO::new);
        System.out.println(initateBOList);

工具類2

//單獨實體類拷貝轉換
 public static <T,F> T toDtoOrInfo(F f, T d){
        BeanUtils.copyProperties(f,d);
        return d;
    }
//嵌套list實體類拷貝轉換
    public static <S,T> List<T> toInfoList(List<S> sList, Class<T> tClass){
        List<T> tList = new ArrayList<>();
        try {
            Constructor<?> constructor = tClass.getConstructor();
            sList.forEach( s -> {
                Object o;
                try {
                    o = constructor.newInstance();
                    tList.add((T)toDtoOrInfo(s, o));
                } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
                    e.printStackTrace();
                }
            });
        } catch ( NoSuchMethodException e) {
            e.printStackTrace();
        }
        return tList;
    }
//使用
toDtoOrInfo(源實體類,new 目標實體類)
toInfoList(源實體類,目標實體類.class)