1.使用POI结合springmvc实现上传

1.引入poi的依赖

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
</dependency>

2.jsp页面编写上传文件

<form action="http://localhost:8085/mango/pay/lotPayThirdAccount/getFile" enctype="multipart/form-data" method="post">
    选择一个文件:
    <input type="file" name="excelFile"/>
    <br/><br/>
    <input type="submit" value="上传" />
</form>

3.后台接收文件(仅有接收步骤,详细API自己看文档)

@RequestMapping(value = "/getFile", method = RequestMethod.POST)
  public GenericResult<?> getFile(@RequestParam(value="excelFile")MultipartFile file,HttpServletRequest req) throws IOException{
    // 获取临时存储路径以及重命名文件
    String filePath = req.getSession().getServletContext().getRealPath("/")+"WEB-INF/upload";  
    String fileName = file.getOriginalFilename();
    fileName = DateUtil.dateToString(new Date(), DateUtil.YYYYMMDDHHMMSS)+fileName;  
    System.err.println("文件上传的临时文件夹:"+filePath);  
    // 校验目录,不存在则创建
    File targetFile = new File(filePath, fileName);  
    if(!targetFile.exists()){  
        targetFile.mkdirs();  
    }  
    //保存  
    try {  
      //将前台传过来的file文件写到targetFile中.  
      file.transferTo(targetFile);  
    } catch (Exception e) {  
      e.printStackTrace();  
    }
    String absolutePath = filePath + "/" + fileName;
        
    InputStream fis = new FileInputStream(absolutePath);  
    Workbook wb = null;
    try {
      wb = WorkbookFactory.create(fis);
    } catch (InvalidFormatException e) {
      e.printStackTrace();
    }
Sheet sheet
= wb.getSheetAt(0); int totalRowNum = sheet.getLastRowNum(); System.out.println(totalRowNum); return null; }

以上是简单的一个接收流程,如果WorkbookFactory.create(fis)包内存溢出的错误, eclipse的vm配置为:

-Xms256M -Xmx512M -XX:PermSize=256m -XX:MaxPermSize=512m

即可解决。

原文地址:https://www.cnblogs.com/Json1208/p/9039194.html