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>