java中單對象屬性拷貝工具類 & list類型轉化工具類

import org.springframework.beans.BeanUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


/**
 * 操作bean工具類
 *
 * @date 2018/11/29 10:36
 **/
public class BeanUtil {
    /**
     * 單對象屬性拷貝
     *
     * @param o   被拷貝對象
     * @param c   拷入對象
     * @param <T>
     * @return
     */
    public static <T> T copyPropertiesToT(Object o, Class<T> c) {
        T t = null;
        try {
            t = c.newInstance();
        } catch (InstantiationException | IllegalAccessException e) {
            e.printStackTrace();
        }
        assert t != null;
        if(o == null){
            return null;
        }
        BeanUtils.copyProperties(o, t);
        return t;
    }

    /**
     * list類型轉化
     * @param oList 待轉list
     * @param c 實體類型
     * @param <T>
     * @return
     */
    public static <T> List<T> copyPropertiesToList(List<?> oList, Class<T> c) {
        if(oList == null){
            return new ArrayList<>();
        }
        return oList.stream().map(o -> {
            T t = null;
            try {
                t = c.newInstance();
                BeanUtils.copyProperties(o, t);
                return t;
            } catch (InstantiationException | IllegalAccessException e) {
                e.printStackTrace();
                return null;
            }
        }).collect(Collectors.toList());
    }

 /**
     * PageInfo對象轉換
     * @param fromPage	待轉PageInfo
     * @param c	實體類型
     * @return
     */
    public static <T> PageInfo<T> getPageInfoData(PageInfo<?> fromPage, T data){
    	
    	PageInfo<T> result = new PageInfo<T>();
    	
    	result.setCurrentPage(fromPage.getCurrentPage());
    	result.setPageSize(fromPage.getPageSize());
    	result.setTotalCount(fromPage.getTotalCount());
    	result.setTotalPage(fromPage.getTotalPage());
    	result.setDataList(data);
    	
    	return result;
    }


/**
     * 例子如下
     * @param args
     */
    public static void main(String[] args) {
        List<ClientBase> list = new ArrayList<>();
        list.add(MockUtil.mock(new ClientBase()));
        list.add(MockUtil.mock(new ClientBase()));
        list.add(MockUtil.mock(new ClientBase()));
        list.add(MockUtil.mock(new ClientBase()));
        List<ClientBaseVO> clientBaseVOS = BeanUtil.copyPropertiesToList(list, ClientBaseVO.class);
        System.out.println(clientBaseVOS.size());


        ClientBaseVO clientBaseVO = BeanUtil.copyPropertiesToT(MockUtil.mock(new ClientBase()), ClientBaseVO.class);
        System.out.println(clientBaseVO);


        PageInfo<List<ClientBaseVO>> pageData = null;
        List<LoanOrderListVo> a  = BeanUtil.copyPropertiesToList(pageData.getDataList(), LoanOrderListVo.class);
        PageInfo<List<LoanOrderListVo>>  b = BeanUtil.getPageInfoData(pageData,a);
    }

}