在Spring Boot中实现分布式文件存储：FastDFS的应用

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import com.github.tobato.fastdfs.domain.fdfs.StorePath;
import com.github.tobato.fastdfs.service.FastFileStorageClient;
 
@RestController
public class FileController {
 
    @Autowired
    private FastFileStorageClient fastFileStorageClient;
 
    @PostMapping("/upload")
    public String uploadFile(@RequestParam("file") MultipartFile file) throws Exception {
        StorePath storePath = fastFileStorageClient.uploadFile(file.getInputStream(), file.getSize(),
                "jpg", null);
        return storePath.getFullPath();
    }
 
    @GetMapping("/download")
    public void downloadFile(@RequestParam("fileUrl") String fileUrl, @RequestParam("response") HttpServletResponse response) {
        try {
            StorePath storePath = StorePath.parseFromUrl(fileUrl);
            byte[] bytes = fastFileStorageClient.downloadFile(storePath.getGroup(), storePath.getPath(), new DownloadByteArray());
            response.getOutputStream().write(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

这个代码实例提供了文件上传和下载的简单操作。上传操作接收一个MultipartFile对象，并使用FastFileStorageClient上传到FastDFS。下载操作接收一个文件路径，并使用FastFileStorageClient下载文件。这里假设DownloadByteArray是一个实现了DownloadCallback<byte[]>的类，用于处理下载的字节数据。