SPRINGBOOT之文件上传与下载

注意：代码的编写是在建立Marven工程的基础上编写的

比较简单，直接上代码：

单文件:

@RequestMapping(value = "/testUploadFile", method = RequestMethod.POST)
  public void testUploadFile(HttpServletRequest req,
      MultipartHttpServletRequest multiReq) {
    // 获取上传文件的路径
    String uploadFilePath = multiReq.getFile("file1").getOriginalFilename();
    System.out.println("uploadFlePath:" + uploadFilePath);
    // 截取上传文件的文件名
    String uploadFileName = uploadFilePath.substring(
        uploadFilePath.lastIndexOf('\\') + 1, uploadFilePath.indexOf('.'));
    System.out.println("multiReq.getFile()" + uploadFileName);
    // 截取上传文件的后缀
    String uploadFileSuffix = uploadFilePath.substring(
        uploadFilePath.indexOf('.') + 1, uploadFilePath.length());
    System.out.println("uploadFileSuffix:" + uploadFileSuffix);
    FileOutputStream fos = null;
    FileInputStream fis = null;
    try {
      fis = (FileInputStream) multiReq.getFile("file1").getInputStream();
      fos = new FileOutputStream(new File(".//uploadFiles//" + uploadFileName
          + ".")
          + uploadFileSuffix);
      byte[] temp = new byte[1024];
      int i = fis.read(temp);
      while (i != -1){
        fos.write(temp,0,temp.length);
        fos.flush();
        i = fis.read(temp);
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      if (fis != null) {
        try {
          fis.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      if (fos != null) {
        try {
          fos.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

多文件

@RequestMapping(value = "testUploadFiles", method = RequestMethod.POST)  @ResponseBody  public void handleFileUpload(HttpServletRequest request) {    List<MultipartFile> files = ((MultipartHttpServletRequest) request)        .getFiles("file");    MultipartFile file = null;    BufferedOutputStream stream = null;    for (int i = 0; i < files.size(); ++i) {      file = files.get(i);      if (!file.isEmpty()) {        try {          String uploadFilePath = file.getOriginalFilename();          System.out.println("uploadFlePath:" + uploadFilePath);          // 截取上传文件的文件名          String uploadFileName = uploadFilePath              .substring(uploadFilePath.lastIndexOf('\\') + 1,                  uploadFilePath.indexOf('.'));          System.out.println("multiReq.getFile()" + uploadFileName);          // 截取上传文件的后缀          String uploadFileSuffix = uploadFilePath.substring(              uploadFilePath.indexOf('.') + 1, uploadFilePath.length());          System.out.println("uploadFileSuffix:" + uploadFileSuffix);          stream = new BufferedOutputStream(new FileOutputStream(new File(              ".//uploadFiles//" + uploadFileName + "." + uploadFileSuffix)));          byte[] bytes = file.getBytes();          stream.write(bytes,0,bytes.length);        } catch (Exception e) {          e.printStackTrace();        } finally {          try {            if (stream != null) {              stream.close();            }          } catch (IOException e) {            e.printStackTrace();          }        }      } else {        System.out.println("上传文件为空");      }    }    System.out.println("文件接受成功了");  }

下载文件 服务器端代码:

  public void testDownload(HttpServletResponse res) {    String fileName = "upload.jpg";    res.setHeader("content-type", "application/octet-stream");    res.setContentType("application/octet-stream");    res.setHeader("Content-Disposition", "attachment;filename=" + fileName);    byte[] buff = new byte[1024];    BufferedInputStream bis = null;    OutputStream os = null;    try {      os = res.getOutputStream();      bis = new BufferedInputStream(new FileInputStream(new File("d://"          + fileName)));      int i = bis.read(buff);      while (i != -1) {        os.write(buff, 0, buff.length);        os.flush();        i = bis.read(buff);      }    } catch (IOException e) {      e.printStackTrace();    } finally {      if (bis != null) {        try {          bis.close();        } catch (IOException e) {          e.printStackTrace();        }      }    }    System.out.println("success");  }}

浏览器代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><form action="http://localhost:8080/testUploadFile" method="POST" enctype="multipart/form-data">    <p>单文件上传：</><br/>    <input type="file" name="file1"/>    <input type="submit" value = "上传"/></form><form method="POST" enctype="multipart/form-data"     action="http://localhost:8080/testUploadFiles">    <p>多文件上传：</>    <p>文件1：<input type="file" name="file" /></p>    <p>文件2：<input type="file" name="file" /></p>    <p><input type="submit" value="上传" /></p></form><a href="http://localhost:8080/testDownload">下载</a></body></html>