SpringBoot（三）：文件下载-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_26641781/article/details/86579436

在原来的SpringBoot–uploadfile项目基础上添加文件下载的Controller：

 @RequestMapping(value = "/testDownload", method = RequestMethod.GET)
        public void Download(HttpServletResponse res) {
          String fileName = "1.png";
          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");
        }

需要下载的文件放在D盘。

 @RequestMapping(value = "/download", method = RequestMethod.GET)
     public String Download() {
         return "/fileDownload";
     }

fileDownload.html：

<html>
<head>
<meta charset="UTF-8"/>
<title>文件下载示例</title>
</head>
<body>
    <h2>文件下载示例</h2>
    <hr/>
    <a href="/testDownload">下载</a>
</body>
</html>