파일 업로드

[namyesol]

Spring File Download 정리

Content-Disposition

• RFC6266
• RFC6266
• Test Cases for HTTP Content-Disposition header field (RFC 6266) and the Encodings defined in RFCs 2047, 2231 and 5987

Spring

• org.springframework.http.ContentDisposition@Spring+5.0
• [Spring] 파일 다운로드 시 한글 깨짐 처리
• Spring Boot File Download Example
• 파일 다운로드 시 Content-Disposition 한글 파일 이름 깨지는 오류 조치
• Out Of Memory 이슈로 인해 Buffer를 사용하도록 구현되어야 함.
• 일간에러 2021-12-22 파일 다운로드시 한글 파일명 처리
• [JAVA] 이미지 파일 업로드

AJAX

• XMLHttpRequest
• FormData

[namyesol]

Spring 4

@RequestMapping(value = "/{resourceIdentifier}", method = RequestMethod.GET, produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
// @ResponseBody // Needed for @Controller but not for @RestController.
public ResponseEntity<InputStreamResource> download(@PathVariable(name = "resourceIdentifier") final String filename) throws Exception
{
    final String resourceName = filename + ".dat";
    final File iFile = new File("/some/folder", resourceName);
    final long resourceLength = iFile.length();
    final long lastModified = iFile.lastModified();
    final InputStream resource = new FileInputStream(iFile);

    return ResponseEntity.ok()
            .header("Content-Disposition", "attachment; filename=" + resourceName)
            .contentLength(resourceLength)
            .lastModified(lastModified)
            .contentType(MediaType.APPLICATION_OCTET_STREAM_VALUE) // For Spring 5: APPLICATION_OCTET_STREAM
            .body(resource);
}

[namyesol]

For big size files, an user should, when downloading, wait for a period of time. You need to provide some following information to the browser:

Content-Disposition Content-Disposition: means information on the Header part of Response. It shows the contents expected to be displayed on the browser. inline: Content that will display automatically. attachment: Attached file form-data: Form data. ....

Content-Disposition: inline
Content-Disposition: attachment
Content-Disposition: attachment; filename="java-tutorial.pdf"

Content-Length contentLength: This is the size of content (Unit: byte). This information helps the browser to inform to users of the size of content prepared to be downloaded. Therefore, while downloading the browser, it is possible to notify to users of the number of bytes downloaded, display percentage downloaded, estimate remaining time.

Content-Type This information helps the browser to know which applications can open this content and suggest users to open by a program available on their computer when the content is downloaded successfully. Set Content-Type=application/octet-stream if you want the browser to download such content immediately without asking users.

Content-Type: application/octet-stream
Content-Disposition: attachment; filename="picture.png"

Content-Type: image/png
Content-Disposition: attachment; filename="picture.png"

Content-Type: image/png
Content-Disposition: inline; filename="picture.png"

[namyesol]

개념 정리 -- MVC / JSP / Spring(Boot) / JDBC / MyBatis / JPA / REST api