Spring Boot 파일 등록 관리

여 파일 에 밑에글을 복붙해준다

 

## MULTIPART (MultipartProperties)
# Enable multipart uploads
spring.servlet.multipart.enabled=true
# Threshold after which files are written to disk.
spring.servlet.multipart.file-size-threshold=2KB
# Max file size.
spring.servlet.multipart.max-file-size=200MB
# Max Request Size
spring.servlet.multipart.max-request-size=215MB

 

 이거를 붙혀 넣는다

 

jsp나 html 에는 

<form > teg 안에는

  enctype = "multipart/form-data" <- 이걸 꼭 적어줘야 한다

 

'서버 로직

package com.ezen.demo.Controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/files/")
public class UploadController 
{
   @Autowired
   ResourceLoader resourceLoader;

   @GetMapping("upload")
   public String getForm() {
      return "/Upload/upload_form";
   }
   
   @PostMapping("upload")
   @ResponseBody
   public String upload(@RequestParam("files")MultipartFile[] mfiles,
         HttpServletRequest request,
         @RequestParam("author") String author) {
      ServletContext context = request.getServletContext();
      String savePath = context.getRealPath("/WEB-INF/files");

      /* static/upload 디렉토리에 업로드하려면, 아래처럼 절대경로를 구하여 사용하면 된다
      * Resource resource = resourceLoader.getResource("classpath:/static");
      * String absolutePath = resource.getFile().getAbsolutePath();
      */ 
      try {
         for(int i=0;i<mfiles.length;i++) {
            mfiles[i].transferTo(
              new File(savePath+"/"+mfiles[i].getOriginalFilename()));
            /* MultipartFile 주요 메소드
            String cType = mfiles[i].getContentType();
            String pName = mfiles[i].getName();
            Resource res = mfiles[i].getResource();
            long fSize = mfiles[i].getSize();
            boolean empty = mfiles[i].isEmpty();
            */
         }
         String msg = String.format("파일(%d)개 저장성공(작성자:%s)", mfiles.length,author);
         return msg;
      } catch (Exception e) {
         e.printStackTrace();
         return "파일 저장 실패:";
      }
   }
   
   @GetMapping("download/{filename}")
   public ResponseEntity<Resource> download(
         HttpServletRequest request,
         @PathVariable String filename){
      Resource resource = resourceLoader.getResource("WEB-INF/upload/"+filename);
      System.out.println("파일명:"+resource.getFilename());
        String contentType = null;
        try {
            contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        if(contentType == null) {
            contentType = "application/octet-stream";
        }
 
        return ResponseEntity.ok()
                .contentType(MediaType.parseMediaType(contentType))
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
                .body(resource);
   }
}