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

  
    
      org.apache.poi
      poi-ooxml-schemas
      3.14-beta1
    

     
    
      commons-fileupload
      commons-fileupload
      1.2.2
    
    
      commons-io
      commons-io
      2.4
      

2.在spring-mvc.xml中配置文件上传解析器

 
  
  
    
    
      5242880
    
  

3.创建index.html

导出


  
  

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 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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