gitee最多上传多大文件_SpringBoot图文教程4—SpringBoot 实现文件上传下载

<form action="路径...." method="post" enctype="multipart/form-data">
        <input type="file" name="aa">
        <input type="submit" value="上传">
</form>
<!--
    1. 表单提交方式必须是post
    2. 表单的enctype属性必须为multipart/form-data
    3. 后台接受变量名字要与文件选择name属性一致
    4.action写Controller的方法的路径
-->

@Controller
@RequestMapping("/file")
public class FileController {
  @RequestMapping("/upload")
  public String upload(MultipartFile aa, HttpServletRequest request) throws IOException {
//获取upload文件夹的路径 
        String realPath = request.getRealPath("/upload");
//将上传的文件写入 upload文件夹 中
        aa.transferTo(new File(realPath,aa.getOriginalFilename()));//文件上传
        return "index";
  }
}

#上传时出现如下异常:  上传文件的大小超出默认配置  默认10M
nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (38443713) exceeds the configured maximum (10485760)

<a href="../file/download?fileName=corejava.txt">corejava.txt</a>

@RequestMapping("/download")
public void download(String fileName, HttpServletRequest request, HttpServletResponse response) throws Exception {
//获取upload文件夹的路径
        String realPath = request.getRealPath("/upload");
//通过流读取文件
        FileInputStream is = new FileInputStream(new File(realPath, fileName));
//获得响应流
        ServletOutputStream os = response.getOutputStream();
//设置响应头信息
        response.setHeader("content-disposition","attachment;fileName="+ URLEncoder.encode(fileName,"UTF-8"));
//通过响应流将文件输入流读取到的文件写出
        IOUtils.copy(is,os);
//关闭流
        IOUtils.closeQuietly(is);
        IOUtils.closeQuietly(os);
    }