SSM框架使用poi导入导出Excel的详细方法

1.首先我们先导入poi和文件上传的依赖

1. <!--POI-->
2. <dependency>
3. <groupId>org.apache.poi</groupId>
4. <artifactId>poi-ooxml-schemas</artifactId>
5. <version>3.14-beta1</version>
6. </dependency>
7.  
8. <!--文件上传依赖-->
9. <dependency>
10. <groupId>commons-fileupload</groupId>
11. <artifactId>commons-fileupload</artifactId>
12. <version>1.2.2</version>
13. </dependency>
14. <dependency>
15. <groupId>commons-io</groupId>
16. <artifactId>commons-io</artifactId>
17. <version>2.4</version>
18. </dependency>

2.在spring-mvc.xml中配置文件上传解析器

1. <!-- 配置文件上传解析器 -->
2. <!-- id 的值是固定的-->
3. <bean id="multipartResolver"
4. class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
5. <!-- 设置上传文件的最大尺寸为 5MB -->
6. <property name="maxUploadSize">
7. <value>5242880</value>
8. </property>
9. </bean>

3.创建index.html

1. <!-- excel文件导出 -->
2. <p><a href="User/exportExcel.do" rel="external nofollow" >导出</a>
3. <!-- excel文件导入 -->
4. <form action="User/importExcel.do" method="post" enctype="multipart/form-data">
5. <input type="file" name="userExcel" />
6. <input type="submit" value="导入">
7. </form>

4.创建实体类

1. public class User {
2. private Integer id;
3. private String username;
4. private String password;
5. /* get 和 set */
6. }

5.Controller层

1. /**
2. * 导出Excel
3. * @param request
4. * @param response
5. */
6. @RequestMapping("/exportExcel")
7. @ResponseBody
8. public void exportExcel(HttpServletRequest request, HttpServletResponse response){
9. try {
10. //获取数据源
11. List<User> userList = service.queryUserAll();
12. //导出excel
13. response.setHeader("Content-Disposition","attachment;filename="+new String("用户信息.xls".getBytes(),"ISO-8859-1"));
14. response.setContentType("application/x-excel;charset=UTF-8");
15. OutputStream outputStream = response.getOutputStream();
16. //导出
17. service.exportExcel(userList,outputStream);
18. outputStream.close();
19. } catch (IOException e) {
20. e.printStackTrace();
21. }
22. }

1. /**
2. * 导入exc
3. * @param userExcel
4. * @param request
5. * @param session
6. * @return
7. */
8.  
9. @RequestMapping("/importExcel")
10. @ResponseBody
11. public String importExcel(MultipartFile userExcel, HttpServletRequest request, HttpSession session) throws IOException, InvalidFormatException {
12. if(userExcel == null){
13. session.setAttribute("excelName", "未上传文件，上传失败！");
14. return null;
15. }
16. String userExcelFileName = userExcel.getOriginalFilename();
17. if(!userExcelFileName.matches("^.+\\.(?i)((xls)|(xlsx))$")){
18. session.setAttribute("excelName", "文件格式不正确！请使用.xls或.xlsx后缀的文档，导入失败！");
19. return null;
20. }
21. //导入
22. service.importExcel(userExcel);
23. session.setAttribute("excelName", "导入成功！");
24. return "redirect:queryUserAll.do";
25. }

6.运行测试

1.点击导出将数据库的内容以后缀为 .xls的文件下载下来

2. 选择Excel文件点击导入会将文件里的内容导入到数据库中

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原文链接：https://blog.csdn.net/weixin_51311866/article/details/115246070