1. CopyUtil

package com.gblfy.wiki.util;import org.springframework.beans.BeanUtils;
import org.springframework.util.CollectionUtils;import java.util.ArrayList;
import java.util.List;/*** @author gblfy* @desc list和对象数据复制* @date 2021-04-13*/
public class CopyUtil {/*** 单体复制*/public static <T> T copy(Object source, Class<T> clazz) {if (source == null) {return null;}T obj = null;try {obj = clazz.newInstance();} catch (Exception e) {e.printStackTrace();return null;}BeanUtils.copyProperties(source, obj);return obj;}/*** 列表复制*/public static <T> List<T> copyList(List source, Class<T> clazz) {List<T> target = new ArrayList<>();if (!CollectionUtils.isEmpty(source)) {for (Object c : source) {T obj = copy(c, clazz);target.add(obj);}}return target;}
}

2. 使用案例

package com.gblfy.wiki.service;import com.gblfy.wiki.entity.Ebook;
import com.gblfy.wiki.entity.EbookExample;
import com.gblfy.wiki.mapper.EbookMapper;
import com.gblfy.wiki.req.EbookQueryReq;
import com.gblfy.wiki.resp.CommonResp;
import com.gblfy.wiki.resp.EbookQueryResp;
import com.gblfy.wiki.util.CopyUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;import java.util.List;@Service
public class EbookServiceImpl {@Autowiredprivate EbookMapper ebookMapper;public List<EbookQueryResp> list(EbookQueryReq req) {EbookExample example = new EbookExample();EbookExample.Criteria criteria = example.createCriteria();if (!ObjectUtils.isEmpty(req.getName())) {criteria.andNameLike("%" + req.getName() + "%");}List<Ebook> ebookList = ebookMapper.selectByExample(example);//集合数据复制 使用案例List<EbookQueryResp> list = CopyUtil.copyList(ebookList, EbookQueryResp.class);//对象数据复制 使用案例Ebook ebook = CopyUtil.copy(req, Ebook.class);return list;}
}