springboot利用easypoi实现简单导出Excel

vue springboot利用easypoi实现简单导出

• 前言
• 一、easypoi是什么？
• 二、使用步骤
  • 1.传送门
  • 2.前端vue
  • 3.后端springboot
    • 3.1编写实体类（我这里是dto,也一样）
    • 3.2控制层
• 结尾

       <!--easypoi导入导出--><dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-base</artifactId><version>4.1.3</version></dependency><dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-web</artifactId><version>4.1.3</version></dependency><dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-annotation</artifactId><version>4.1.3</version></dependency>

<dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-spring-boot-starter</artifactId><version>4.0.0</version>
</dependency>

package top.wangxingjun.separate.dto;import cn.afterturn.easypoi.excel.annotation.Excel;
import top.wangxingjun.separate.dto.base.OutputConverter;
import top.wangxingjun.separate.entity.AdminRole;
import top.wangxingjun.separate.entity.User;
import lombok.Data;
import lombok.ToString;import java.util.List;/*** @author wxj* @Date 2020/8/10*/
@Data
@ToString
public class UserDTO implements OutputConverter<UserDTO, User> {@Excel(name = "编号")private int id;@Excel(name = "账号")private String username;@Excel(name = "真实姓名")private String name;@Excel(name = "手机号")private String phone;@Excel(name = "邮箱")private String email;@Excel(name = "状态",replace = {"启用_true","禁用_false"})private boolean enabled;}

    /*** 用户信息导出*/@GetMapping("api/exportUser")public void exportUser(HttpServletResponse response) throws Exception {List<UserDTO> list = userService.list();ExcelUtil.exportExcel(list, null, "sheet1", UserDTO.class, "用户信息", response);}

 package top.wangxingjun.separate.util;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;
import lombok.extern.log4j.Log4j2;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;/*** @ProjectName: separate* @Package: top.wangxingjun.separate.util* @ClassName: ExcelUtil* @Author: wxj* @Description: Excel导入导出工具类* @Date: 2020/8/25 10:07* @Version: 1.0*/
@Log4j2
public class ExcelUtil {/*** Map集合导出** @param list     需要导出的数据* @param fileName 导出的文件名* @param response HttpServletResponse对象*/public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws Exception{defaultExport(list, fileName, response);}/*** 复杂导出Excel，包括文件名以及表名（不创建表头）** @param list      需要导出的数据* @param title     表格首行标题（不需要就传null）* @param sheetName 工作表名称* @param pojoClass 映射的实体类* @param fileName  导出的文件名（如果为null，则默认文件名为当前时间戳）* @param response  HttpServletResponse对象*/public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,HttpServletResponse response) throws Exception{defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));}/*** 复杂导出Excel，包括文件名以及表名（创建表头）** @param list           需要导出的数据* @param title          表格首行标题（不需要就传null）* @param sheetName      工作表名称* @param pojoClass      映射的实体类* @param fileName       导出的文件名* @param isCreateHeader 是否创建表头* @param response       HttpServletResponse对象*/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);}/*** 默认导出方法** @param list         需要导出的数据* @param pojoClass    对应的实体类* @param fileName     导出的文件名* @param response     HttpServletResponse对象* @param exportParams 导出参数实体*/private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,ExportParams exportParams) throws Exception{Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);downloadExcel(fileName, workbook, response);}/*** 默认导出方法** @param list     Map集合* @param fileName 导出的文件名* @param response HttpServletResponse对象*/private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response)throws Exception {Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);if (null != workbook) {downloadExcel(fileName, workbook, response);}}/*** Excel导出** @param fileName Excel导出* @param workbook Excel对象* @param response HttpServletResponse对象*/public static void downloadExcel(String fileName, Workbook workbook, HttpServletResponse response) throws Exception{try {if (StringUtils.isEmpty(fileName)) {throw new RuntimeException("导出文件名不能为空");}String encodeFileName = URLEncoder.encode(fileName, "UTF-8");response.setHeader("content-Type", "application/vnd.ms-excel; charset=utf-8");response.setHeader("Content-Disposition", "attachment;filename=" + encodeFileName);response.setHeader("FileName", encodeFileName);response.setHeader("Access-Control-Expose-Headers", "FileName");workbook.write(response.getOutputStream());} catch (Exception e) {log.error(e.getMessage(), e);}}/*** 根据文件路径来导入Excel** @param filePath   文件路径* @param titleRows  表标题的行数* @param headerRows 表头行数* @param pojoClass  映射的实体类* @return*/public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception{//判断文件是否存在if (StringUtils.isBlank(filePath)) {return null;}ImportParams params = new ImportParams();params.setTitleRows(titleRows);params.setHeadRows(headerRows);List<T> list = null;try {list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);} catch (NoSuchElementException e) {log.error("模板不能为空", e);} catch (Exception e) {log.error(e.getMessage(), e);}return list;}/*** 根据接收的Excel文件来导入Excel,并封装成实体类** @param file       上传的文件* @param titleRows  表标题的行数* @param headerRows 表头行数* @param pojoClass  映射的实体类* @return*/public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception{if (file == null) {return null;}ImportParams params = new ImportParams();params.setTitleRows(titleRows);params.setHeadRows(headerRows);List<T> list = null;try {list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);} catch (NoSuchElementException e) {log.error("excel文件不能为空", e);} catch (Exception e) {log.error(e.getMessage(), e);}return list;}/*** 文件转List** @param file* @param pojoClass* @param <T>* @return*/public static <T> List<T> fileToList(MultipartFile file, Class<T> pojoClass) throws Exception{if (file.isEmpty()) {throw new RuntimeException("文件为空");}List<T> list = ExcelUtil.importExcel(file, 1, 1, pojoClass);if (CollectionUtils.isEmpty(list)) {throw new RuntimeException("未解析到表格数据");}return list;}
}