Springboot+EasyPOI+Mybatis 进行对MySQL数据库内表进行导入导出

最近写功能用到导入导出，在网上发现easypoi，非常好用，个人感觉非常适合中小型项目的使用。
首先感谢 easypoi官方教程
还有俩位大佬的技术支持
https://www.jianshu.com/p/b49459fe3c06
https://www.jianshu.com/p/5d67fb720ece
个人感觉easypoi不像poi代码量那么大，非常轻巧，可以快速上手的api
好了，废话不多说实战and代码

• 导包 配置pom.xml

		
		
			cn.afterturn
			easypoi-base
			3.0.3
		
		
			cn.afterturn
			easypoi-web
			3.0.3
		
		
			cn.afterturn
			easypoi-annotation
			3.0.3
		

还有一个jar包是我lib里面放着的，这里注意一下，如果版本是3.3.1的话会进行报错，具体原因我也很懵，之前我用3.3.1启动springboot就报错，后来解决错误时，是因为这个jar包版本太低导致，所以我强烈推荐用3.3.9版本的包

• 工具类 WebExcelUtil
  这个工具类我借鉴了大佬们的工具类，在此感谢上面的大佬

import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;

/**
 * 
 * @ClassName: WebExcelUtil.java
 * @Description: EasyPOI Excel 导入导出工具类
 * @author ajia
 *
 */
public class WebExcelUtil {
	public static void exportExcel(List list, String title, String sheetName, Class pojoClass, String fileName,
		boolean isCreateHeader, HttpServletResponse response) throws Exception {
		ExportParams exportParams = new ExportParams(title, sheetName);
		exportParams.setCreateHeadRows(isCreateHeader);
		defaultExport(list, pojoClass, fileName, response, exportParams);

	}
	/**
	 * 
	  * @Title: exportExcel  
	  * @Description: 常用导出
	  * @return void 
	 */
	public static void exportExcel(List list, String title, String sheetName, Class pojoClass, String fileName,
			HttpServletResponse response) {
		try {
			defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static void exportExcel(List> list, String fileName, HttpServletResponse response) {
		try {
			defaultExport(list, fileName, response);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	/**
	 * 
	  * @Title: defaultExport  
	  * @Description: 默认导出  
	  * @return void 
	 */
	private static void defaultExport(List list, Class pojoClass, String fileName, HttpServletResponse response,
			ExportParams exportParams) throws Exception {
		Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
		if (workbook != null)
			;
		downLoadExcel(fileName, response, workbook);
	}
	/**
	 * 
	  * @Title: downLoadExcel  
	  * @Description: 下载excel  
	  * @return void 
	 */
	private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook)
			throws Exception {
		try {
			response.setCharacterEncoding("UTF-8");
			response.setHeader("content-Type", "application/vnd.ms-excel");
			response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
			workbook.write(response.getOutputStream());
		} catch (IOException e) {
			throw new Exception(e.getMessage());
		}
	}

	private static void defaultExport(List> list, String fileName, HttpServletResponse response)
			throws Exception {
		Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
		if (workbook != null)
			;
		downLoadExcel(fileName, response, workbook);
	}

	public static  List importExcel(String filePath, Integer titleRows, Integer headerRows, Class pojoClass)
			throws Exception {
		if (StringUtils.isBlank(filePath)) {
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		List list = null;
		try {
			list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
		} catch (NoSuchElementException e) {
			throw new Exception("模板不能为空");
		} catch (Exception e) {
			e.printStackTrace();
			throw new Exception(e.getMessage());
		}
		return list;
	}

	public static  List importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class pojoClass)
			throws Exception {
		if (file == null) {
			return null;
		}
		ImportParams params = new ImportParams();
		params.setTitleRows(titleRows);
		params.setHeadRows(headerRows);
		List list = null;
		try {
			list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
		} catch (NoSuchElementException e) {
			throw new Exception("excel文件不能为空");
		} catch (Exception e) {
			throw new Exception(e.getMessage());
		}
		return list;
	}

}

这个没有太多描述的感兴趣的去easypoi官网研究，开源代码

首先我们先写导出功能

• Controller 编写

@PostMapping("/cfq/export")
	public void export(HttpServletResponse response) {
		List list = cfqservice.list();
		logger.info("----/cfq/export---导出----");
		WebExcelUtil.exportExcel(list, "设备表", "sheet1", IotCfq.class, "cfqtable.xls", response);
	}

你没看错就俩行代码直接导出，其中调了一个list查询方法，对表内数据的查询方法。

• Service and Serviceimp

Service 的一个接口  提示IotCfq是我对应数据库表内的实体类
List list();
 
 	@Override
	public List list() {
		
		return cfqmapper.list();
	}

这里写了一个测试的所有没那么多业务代码

mapper and mapper.xml

List list();

需要注意的是实体类
首先你必须的有个空构造函数
然后每一个实例类上面写注解

 	@Excel(name = "设备编号", width = 25,orderNum = "0")
    private String sebbh;
    name是导入或者导出Excel对应的列名，width是Excel表列宽
    这个可以去官方文档进行看，easypoi的核心就在这个注解上

以上就是导出的内容。
接下来进行写导入
工具类不变直接写controller

	@PostMapping("/cfq/import")
	public void upload(MultipartFile file, HttpServletRequest request) throws Exception {

		ImportParams params = new ImportParams();
		params.setTitleRows(0);
		params.setHeadRows(1);
		List list;
		try {
			// excel的数据
			list = WebExcelUtil.importExcel(file, 1, 1, IotCfq.class);

			/*这里是定义中循环遍历的方式，我觉得太麻烦就用了第二种
			 * for (int i = 0; i < list.size(); i++) { IotCfq cfq = new IotCfq();
			 * cfq.setSebbh(list.get(i).getSebbh()); cfq.setBjfs(list.get(i).getBjfs());
			 * cfq.setCfqtype(list.get(i).getCfqtype());
			 * cfq.setCuftj(list.get(i).getCuftj()); cfq.setMinc(list.get(i).getMinc());
			 * cfq.setUpdatetime(new Date()); cfq.setCfqzt(list.get(i).getCfqzt());
			 * cfq.setFzid(list.get(i).getFzid());
			 * 
			 * // cfqservice.add(cfq); }
			 */
			
			for (IotCfq icq : list) {
				IotCfq cfq = new IotCfq();
				cfq.setSebbh(icq.getSebbh());
				cfq.setBjfs(icq.getBjfs());
				cfq.setCfqtype(icq.getCfqtype());
				cfq.setCuftj(icq.getCuftj());
				cfq.setMinc(icq.getMinc());
				cfq.setUpdatetime(new Date());
				cfq.setCfqzt(icq.getCfqzt());
				cfq.setFzid(icq.getFzid());
				
				cfqservice.add(cfq);//调用了一个新增的方法
				
			}
			logger.info("---/cfq/import---导入---");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();

		}

	}

导入就是将excel表内数据存储的数据库，无非就是遍历存储，这里调用可一个存储的方法add，其余只要细心无太大问题。尤其注意实体类上不想让其导入导出的字段，不用打、@Excel 就行