Spring Boot 实现多图片上传并回显，涨姿势了～

@Controller
public class FileUploadController {
 
    private final StorageService storageService;
 
    @Autowired
    public FileUploadController(StorageService storageService) {
        this.storageService = storageService;
    }
 
    @GetMapping("/")
    public String index() {
        return "index";
    }
 
    @PostMapping("/upload")
    public ResponseEntity<String> handleFileUpload(@RequestParam("files") MultipartFile[] files) {
        List<String> fileNames = new ArrayList<>();
        for (MultipartFile file : files) {
            fileNames.add(storageService.store(file));
        }
        return ResponseEntity.ok(fileNames.toString());
    }
 
    @GetMapping("/download/{filename:.+}")
    public ResponseEntity<Resource> downloadFile(@PathVariable String filename) {
        Resource file = storageService.load(filename);
        return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + file.getFilename() + "\"")
                .body(file);
    }
}

在这个代码实例中，我们定义了一个FileUploadController，它包含了文件上传和文件下载的逻辑。通过handleFileUpload方法，用户可以上传多个文件，文件名称会被存储起来并以字符串形式返回。downloadFile方法允许用户根据文件名下载文件。这里的StorageService是一个抽象层，需要在实际的应用中实现。