资源下载

/**
 * resource下文件下载
 * 
 * @param fName    文件位置（相对于resource）
 * @param dlName   下载文件名
 * @param response
 */
@ApiOperation(value = "resource目录下文件下载", notes = "resource目录下文件下载")
@ApiImplicitParams({
      @ApiImplicitParam(name = "fName", value = "文件相对于resource存储路径，例如'templates/import/import-stu-template.xlsx'", required = true),
      @ApiImplicitParam(name = "dlName", value = "文件下载显示名字", required = true) })
@GetMapping(value = "/res")
public void dlFromResource(String fName, String dlName, HttpServletResponse response) {
   InputStream in = null;
   try {
      in = this.getClass().getClassLoader().getResourceAsStream(fName);
      response.setContentType("application/octet-stream;charset=UTF-8");
      response.addHeader("Content-Disposition", " attachment;filename=" + dlName);
      int count = 0;
      byte[] buffer = new byte[4096];
      while ((count = in.read(buffer)) > 0) {
         response.getOutputStream().write(buffer, 0, count);
      }
   } catch (Exception e) {
      try {
         // 文件下载失败
         response.getWriter().write("对不起，文件下载失败。失败原因：" + e.getMessage());
         // 记录异常
         logger.error(e.getMessage());

      } catch (Exception e1) {
         // 记录异常
         logger.error(e1.getMessage());
      }
   } finally {
      try {
         if (in != null) {
            in.close();
            in = null;
         }
      } catch (Exception e) {
         // 记录异常
         logger.error(e.getMessage());
      }
   }
}