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

<!--POI--> <dependency> <groupId> org.apache.poi </groupId> <artifactId> poi-ooxml-schemas </artifactId> <version> 3.14-beta1 </version> </dependency>   <!--文件上传依赖--> <dependency> <groupId> commons-fileupload </groupId> <artifactId> commons-fileupload </artifactId> <version> 1.2.2 </version> </dependency> <dependency> <groupId> commons-io </groupId> <artifactId> commons-io </artifactId> <version> 2.4 </version> </dependency>

2.在spring-mvc.xml中配置文件上传解析器

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

3.创建index.html

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

4.创建实体类

public class User { private Integer id ; private String username ; private String password ; /* get 和 set */ }

5.Controller层

/** * 导出Excel * @param request * @param response */ @RequestMapping ( "/exportExcel" ) @ResponseBody public void exportExcel ( HttpServletRequest request , HttpServletResponse response ){ try { //获取数据源 List < User > userList = service . queryUserAll (); //导出excel response . setHeader ( "Content-Disposition" , "attachment;filename=" + new String ( "用户信息.xls" . getBytes (), "ISO-8859-1" )); response . setContentType ( "application/x-excel;charset=UTF-8" ); OutputStream outputStream = response . getOutputStream (); //导出 service . exportExcel ( userList , outputStream ); outputStream . close (); } catch ( IOException e ) { e . printStackTrace (); } } /** * 导入exc * @param userExcel * @param request * @param session * @return */   @RequestMapping ( "/importExcel" ) @ResponseBody public String importExcel ( MultipartFile userExcel , HttpServletRequest request , HttpSession session ) throws IOException , InvalidFormatException { if ( userExcel == null ){ session . setAttribute ( "excelName" , "未上传文件，上传失败！" ); return null ; } String userExcelFileName = userExcel . getOriginalFilename (); if (! userExcelFileName . matches ( "^.+\\.(?i)((xls)|(xlsx))$" )){ 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！" ); return null ; } //导入 service . importExcel ( userExcel ); session . setAttribute ( "excelName" , "导入成功！" ); return "redirect:queryUserAll.do" ; }

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

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