# SPRING-파일 업로드&다운로드

파일업로드

<form 태그에 enctype=“multipart/form-data” 설정>

< form action="fileupload" method="post" enctype="multipart/form-data“
accept-charset="UTF-8" >
< input type="file" name="uploadfile" />
< input type="submit" value="업로드">
< /form>

<MultipartResolver 사용>

1) pom.xml 의존성 설정

< dependency >
< groupId >commons-fileupload< /groupId >
< artifactId >commons-fileupload< /artifactId >
< version >버전< /version >
< /dependency >

2) 빈 객체 등록

< bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver“/>
< property name="maxUploadSize" value="5242880" /> <!-- 5MB -->
< property name="maxInMemorySize" value="1048576" /> <!-- 1MB -->

<MultipartFile 객체 사용하여 서버 업로드>

@RequestMapping(value = "/fileupload", method = RequestMethod.POST)
public void upload(MultipartFile uploadfile, HttpServletRequest req) {  
String uploadPath = req.getRealPath("upload"); // 서버 실제 경로
String saveName = uploadfile.getOriginalFilename();
File saveFile = new File(uploadPath, saveName); // 저장할 폴더 이름, 저장할 파일 이름
try {
	uploadfile.transferTo(saveFile); 
	} catch (IOException e) {
		e.printStackTrace();
	}
}

<다중파일 업로드>

• MultipartHttpServletRequest 사용
• < input type="file" name="uploadfile" multiple="multiple" />

 @RequestMapping(value = "/fileupload")
public String requestupload2(MultipartHttpServletRequest multiPart, 
HttpServletRequest req) {
	List<MultipartFile> fileList = multiPart.getFiles("uploadfile”);
	String name = multiPart.getParameter(input name);
	String uploadPath = req.getRealPath(“upload”);
	for (MultipartFile mf : fileList) {
	String originFileName = mf.getOriginalFilename(); // 원본 파일 명
	String safeFile = uploadPath + System.currentTimeMillis() + originFileName;
    mf.tarnsferTo(new File(safeFile));
    }
 	return "경로";
 }

파일 다운로드

 String fileName = request.getParameter(＂filename＂);
String sFilePath = request.getRealPath("upload")+"/" + fileName;
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + 			
									URLEncoder.encode(fileName, "utf-8"));                                    
BufferedInputStream bis = new BufferedInputStream(new 		
FileInputStream(sFilePath));
BufferedOutputStream bos = new 		
BufferedOutputStream(response.getOutputStream());
byte b[] = new byte [4096];
int numRead;
while((numRead = bis.read(b, 0, b.length)) != -1) {
	bos.write(b, 0, numRead);
}
bos.flush();
bos.close();
bis.close();