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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