spring mvc 模板下載

最新推荐文章于 2019-04-07 10:46:00 发布

pingdouble

最新推荐文章于 2019-04-07 10:46:00 发布

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分类专栏： spring 文章标签： mvc down

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本文介绍了一种在Java Web应用中实现文件下载的方法。通过使用Spring MVC框架的@Controller注解和@RequestMapping注解来指定处理文件下载请求的具体路径，并展示了如何设置HTTP响应头以允许客户端下载文件。此外还涉及了文件读取、流操作等步骤。

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@RequestMapping(value = "/download", method = RequestMethod.GET)
public void download(HttpServletRequest request, HttpServletResponse response, HttpSession session) throws Exception {
  try {
   String tempPath = "/template/import.txt";
   String path = session.getServletContext().getRealPath("/");
   path = new String(path.getBytes("ISO-8859-1"), "UTF-8");
   path = path.replace("\\\\", "/");
   File file = new File(path + tempPath);
   if (!file.isFile() || !file.exists() || file.isDirectory()) {
    throw new RuntimeException("下載的文件路徑或文件不存在！");
   }
   response.setContentType("octets/stream");
   response.setContentLength((int) file.length());
   response.addHeader("Content-Disposition", "attachment;filename=" + file.getName());
   FileInputStream fis = new FileInputStream(file);
   BufferedInputStream buff = new BufferedInputStream(fis);
   byte b[] = new byte[1024];
   long k = 0;
   OutputStream out = response.getOutputStream();
   while (k < file.length()) {
    int j = buff.read(b, 0, 1024);
    k += j;
    out.write(b, 0, j);
   }
   out.flush();
   buff.close();
   out.close();
  } catch (Exception e) {
   logger.error(ExceptionUtils.getStackTrace(e));
   throw new RuntimeException(e);
  }
}