Spring Boot简单集成fastDFS

FastDFS简介

FastDFS是一个开源的轻量级分布式文件系统，它解决了大容量存储和负载均衡的问题。FastDFS架构包括Tracker server和Storage server。客户端请求Tracker server进行文件上传、下载，Tracker server负责负载均衡和调度，最终由Storage server完成文件上传和下载。

Spring Boot项目集成FastDFS

添加Maven依赖

在你的Spring Boot项目的pom.xml文件中添加FastDFS Java客户端的依赖。例如：

<dependency>
  <groupId>com.github.tobato</groupId>
  <artifactId>fastdfs-client-spring-boot-starter</artifactId>
    <version>最新版本号</version>
</dependency>

注意：这里的版本号应该替换为FastDFS Java客户端的最新稳定版本。

配置FastDFS连接

在Spring Boot的配置文件（如application.properties或application.yml）中添加FastDFS的连接配置。
例如，在application.yml中配置，

fdfs:
  so-timeout: 1500
  connect-timeout: 600
  thumb-image:
    height: 50
    width: 50
  tracker-list:
    - Tracker服务器地址:端口

创建一个Controller来处理文件上传和下载请求

import com.github.tobato.fastdfs.domain.StorePath;
import com.github.tobato.fastdfs.service.FastFileStorageClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@RestController
@RequestMapping("/file")
public class FileController {

    @Autowired
    private FastFileStorageClient storageClient;

    @PostMapping("/upload")
    public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("文件为空");
        }

        try {
            StorePath storePath = storageClient.uploadFile(
                    file.getInputStream(),
                    file.getSize(),
                    FileUtils.getExtension(file.getOriginalFilename()),
                    null
            );
            return ResponseEntity.ok(storePath.getFullPath());
        } catch (IOException e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("文件上传失败");
        }
    }

    @GetMapping("/download")
    public ResponseEntity<byte[]> downloadFile(@RequestParam("group") String group, @RequestParam("path") String path) {
        if (StringUtils.isEmpty(group) || StringUtils.isEmpty(path)) {
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new byte[0]);
        }

        try {
            byte[] fileContent = storageClient.downloadFile(group, path, null);
            HttpHeaders headers = new HttpHeaders();
            headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + path.substring(path.lastIndexOf("/") + 1) + "\"");
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            return new ResponseEntity<>(fileContent, headers, HttpStatus.OK);
        } catch (IOException e) {
            return ResponseEntity.status(HttpStatus.NOT_FOUND).body(new byte[0]);
        }
    }
}