Srping MVC 파일 다운로드 메모

'HttpServletRequest' & 'HttpServletResponse' 를 숨겨서 파일을 다운로드하는 방법을 기록합니다.
 

@RequestMapping(value="/download/")
public ResponseEntity<byte[]> download(){
                       HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.setContentDispositionFormData("attachment", fileName);
return new ResponseEntity<byte[]>(fileBytes,headers,HttpStatus.CREATED);
 
}

 
 
일반 구현:
 

@RequestMapping(value="/download",method=RequestMethod.POST)
public String download(HttpServletRequest request, HttpServletResponse response){
String fileName= "    ";
InputStream is = null;
BufferedInputStream bis= null;
BufferedOutputStream bos = null;
try{
response.setCharacterEncoding("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
 
response.setContentType("application/x-msdownload;");
response.setHeader("Content-disposition", "attachment; filename="+new String(fileName.getBytes("utf-8"),"ISO8859-1"));
response.setHeader("Content-Length", String.valueOf(inputBytes.length));
 
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(response.getOutputStream());
byte[] buff = new byte[2048];
int bytesRead =0;
while(-1 != (bytesRead = bis.read(buff,0,buff.length))){
bos.write(buff,0,bytesRead);
}
 
}catch(IOException e){
e.printStackTrace();//TODO
}finally{
if(bis != null){
try {
bis.close();
} catch(IOException e){
}
}
if(bos != null){
try {
bos.close();
} catch(IOException e){
}
}
}
return null;
}