FileDownloadWithEncodingSupport.java

import org.springframework.http.HttpHeaders;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import java.net.URLEncoder;
import java.util.Base64;

@RestController
public class FileDownloadController {

    @GetMapping("/download")
    public ResponseEntity<Resource> downloadFile(HttpServletRequest request) throws UnsupportedEncodingException {
        String fileName = "파일명 예시.txt";
        String encodedFileName = null;
        String userAgent = request.getHeader("User-Agent");

        if (userAgent.contains("MSIE") || userAgent.contains("Trident") || userAgent.contains("Edge")) {
            // Internet Explorer, Edge 브라우저인 경우
            encodedFileName = URLEncoder.encode(fileName, "UTF-8").replaceAll("\\+", "%20");
        } else {
            // Chrome, Firefox 등 그 외 브라우저인 경우
            encodedFileName = "=?UTF-8?B?" + Base64.getEncoder().encodeToString(fileName.getBytes("UTF-8")) + "?=";
        }

        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + encodedFileName + "\"");

        // 파일 리소스 및 콘텐츠 타입 설정
        Resource resource = ...;
        return ResponseEntity.ok()
                .headers(headers)
                .body(resource);
    }
}