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YoonTaeMinnnnYoonTaeMinnnn
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[파일다운로드]
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‎upload/src/main/java/hello/upload/controller/ItemController.java

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package hello.upload.controller;
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import hello.upload.domain.Item;
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import hello.upload.domain.ItemRepository;
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import hello.upload.domain.UploadFile;
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import hello.upload.file.FileStore;
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import lombok.RequiredArgsConstructor;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.coyote.Response;
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import org.springframework.core.io.Resource;
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import org.springframework.core.io.UrlResource;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.ResponseEntity;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.*;
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import org.springframework.web.multipart.MultipartFile;
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import org.springframework.web.servlet.mvc.support.RedirectAttributes;
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import org.springframework.web.util.UriUtils;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.nio.charset.StandardCharsets;
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import java.util.List;
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@Slf4j
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@Controller
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@RequiredArgsConstructor
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public class ItemController {
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private final ItemRepository itemRepository;
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private final FileStore fileStore;
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@GetMapping("/items/new")
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public String newForm(@ModelAttribute ItemForm form) {
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return "item-form";
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}
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@PostMapping("/items/new")
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public String saveForm(@ModelAttribute ItemForm form, RedirectAttributes redirectAttributes) throws IOException {
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MultipartFile attachFile = form.getAttachFile();
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UploadFile uploadFile = fileStore.storeFile(attachFile);
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List<MultipartFile> imageFiles = form.getImageFiles();
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List<UploadFile> uploadFiles = fileStore.storeFiles(imageFiles);
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//데이터베이스에 저장 (보통 파일의 경로만 저장) (실제 파일은 s3 같은 곳에 저장)
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Item item = new Item();
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item.setItemName(form.getItemName());
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item.setAttachFile(uploadFile);
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item.setImageFiles(uploadFiles);
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itemRepository.save(item);
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redirectAttributes.addAttribute("itemId", item.getId());
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return "redirect:/items/{itemId}";
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}
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@GetMapping("/items/{id}")
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public String items(@PathVariable Long id, Model model) {
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Item item = itemRepository.findById(id);
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model.addAttribute("item", item);
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return "item-view";
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}
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@ResponseBody
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@GetMapping("/images/{fileName}")
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public Resource downloadImage(@PathVariable String fileName) throws MalformedURLException {
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return new UrlResource("file:" + fileStore.getFullPath(fileName)); //해당 리소스에 있는 파일을 가져온다.
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}
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//첨부파일 다운로드
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@GetMapping("/attach/{itemId}")
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public ResponseEntity<Resource> downloadAttach(@PathVariable Long itemId) throws MalformedURLException {
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Item item = itemRepository.findById(itemId);
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String storeFileName = item.getAttachFile().getStoreFileName();
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String uploadFileName = item.getAttachFile().getUploadFileName();
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UrlResource urlResource = new UrlResource("file:" + fileStore.getFullPath(storeFileName));
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log.info("uploadFileName={}", uploadFileName);
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String encodedUploadFileName = UriUtils.encode(uploadFileName, StandardCharsets.UTF_8); //파일명 인코딩 => 한글 안깨짐
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String contentDisposition = "attachment; filename=\"" + encodedUploadFileName + "\"";
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return ResponseEntity.ok()
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.header(HttpHeaders.CONTENT_DISPOSITION, contentDisposition) //body에 있는 파일을 다운로드 하라 (contentDisposition 이라는 이름으로)
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.body(urlResource);
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}
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}

‎upload/src/main/java/hello/upload/controller/ItemForm.java

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package hello.upload.controller;
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import lombok.Data;
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import org.springframework.web.multipart.MultipartFile;
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import java.util.List;
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@Data
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public class ItemForm {
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private Long itemId;
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private String itemName;
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private MultipartFile attachFile;
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private List<MultipartFile> imageFiles;
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}

‎upload/src/main/java/hello/upload/domain/Item.java

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package hello.upload.domain;
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import lombok.Data;
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import java.util.List;
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@Data
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public class Item {
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private Long id;
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private String itemName;
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private UploadFile attachFile;
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private List<UploadFile> imageFiles;
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}

‎upload/src/main/java/hello/upload/domain/ItemRepository.java

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package hello.upload.domain;
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import org.springframework.stereotype.Repository;
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import java.util.HashMap;
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import java.util.Map;
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@Repository
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public class ItemRepository {
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private final Map<Long, Item> store = new HashMap<>();
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private Long sequence = 0L;
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public Item save(Item item) {
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item.setId(++sequence);
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store.put(item.getId(), item);
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return item;
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}
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public Item findById(Long id) {
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return store.get(id);
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}
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}

‎upload/src/main/java/hello/upload/domain/UploadFile.java

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package hello.upload.domain;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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@Data
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@AllArgsConstructor
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public class UploadFile {
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private String uploadFileName; //사용자가 업로드 한 이름
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private String storeFileName; //서버에서 저장한 이름 (중복 되지 않게 하기 위해)
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}

‎upload/src/main/java/hello/upload/file/FileStore.java

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package hello.upload.file;
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import hello.upload.domain.UploadFile;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.stereotype.Component;
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import org.springframework.web.multipart.MultipartFile;
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import java.io.File;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.UUID;
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@Component
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public class FileStore {
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@Value("${file.dir}")
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private String fileDir;
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public String getFullPath(String fileName) {
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return fileDir + fileName;
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}
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//여러개 저장
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public List<UploadFile> storeFiles(List<MultipartFile> multipartFiles) throws IOException {
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List<UploadFile> store = new ArrayList<>();
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for (MultipartFile multipartFile : multipartFiles) {
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if (!multipartFile.isEmpty()) {
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UploadFile uploadFile = storeFile(multipartFile);
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store.add(uploadFile);
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}
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}
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return store;
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}
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//단일 저장
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public UploadFile storeFile(MultipartFile multipartFile) throws IOException {
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if (multipartFile.isEmpty()) {
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return null;
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}
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String originalFilename = multipartFile.getOriginalFilename(); //asdas.png
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String storeFile = getStoreFile(originalFilename);
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multipartFile.transferTo(new File(getFullPath(storeFile)));
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return new UploadFile(originalFilename, storeFile);
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}
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private String getStoreFile(String originalFileName) {
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String ext = extractExt(originalFileName); // png
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String uuid = UUID.randomUUID().toString(); // asdas-asfa-asf
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return uuid + "." + ext; //ads-ads-ads.png
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}
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private String extractExt(String originalFileName) {
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int i = originalFileName.lastIndexOf(".");
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return originalFileName.substring(i + 1);
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}
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}

‎upload/src/main/resources/templates/item-form.html

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!DOCTYPE HTML>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<div class="container">
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<div class="py-5 text-center">
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<h2>상품 등록</h2>
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</div>
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<form th:action method="post" enctype="multipart/form-data">
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<ul>
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<li>상품명 <input type="text" name="itemName"></li>
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<li>첨부파일<input type="file" name="attachFile" ></li>
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<li>이미지 파일들<input type="file" multiple="multiple"
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name="imageFiles" ></li>
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</ul>
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<input type="submit"/>
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</form>
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</div> <!-- /container -->
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</body>
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</html>

‎upload/src/main/resources/templates/item-view.html

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<!DOCTYPE HTML>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<div class="container">
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<div class="py-5 text-center">
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<h2>상품 조회</h2>
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</div>
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상품명: <span th:text="${item.itemName}">상품명</span><br/>
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첨부파일: <a th:if="${item.attachFile}" th:href="|/attach/${item.id}|"
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th:text="${item.getAttachFile().getUploadFileName()}" /><br/>
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<img th:each="imageFile : ${item.imageFiles}" th:src="|/images/${imageFile.getStoreFileName()}|" width="300" height="300"/>
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</div> <!-- /container -->
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</body>
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</html>

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