@RequestMapping(value = "download.html", method = RequestMethod.GET) 
public void download(String resourceid, HttpServletRequest request, HttpServletResponse response) { 
response.setContentType("charset=UTF-8"); 
File file = new File(path); 
response.setHeader("Content-Disposition", "attachment; filename=a"); 
BufferedInputStream bis = null; 
BufferedOutputStream bos = null; 
OutputStream fos = null; 
InputStream fis = null; 
try { 
fis = new FileInputStream(file.getAbsolutePath()); 
bis = new BufferedInputStream(fis); 
fos = response.getOutputStream(); 
bos = new BufferedOutputStream(fos); 
int bytesRead = 0; 
byte[] buffer = new byte[5 * 1024]; 
while ((bytesRead = bis.read(buffer)) != -1) { 
bos.write(buffer, 0, bytesRead); 
} 
bos.flush(); 
}catch(E e){ 
}finally { 
try { 
bis.close(); 
bos.close(); 
fos.close(); 
fis.close(); 
} catch (IOException e) { 
e.printStackTrace(); 
} 
} 
}

<form action='download.html' method='post'> 
<input type='submit'/> 
</form>

var iframe = "<iframe style='display:none' src='download.html'></iframe>" 
body.append(iframe);

window.open("download.html");