<dependencies>
        <!-- 文件上传组件 -->
        <dependency>
            <groupId>org.csource.fastdfs</groupId>
            <artifactId>fastdfs</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>

FastDFSClient.java
package util;
import org.csource.common.NameValuePair;
import org.csource.fastdfs.ClientGlobal;
import org.csource.fastdfs.StorageClient1;
import org.csource.fastdfs.StorageServer;
import org.csource.fastdfs.TrackerClient;
import org.csource.fastdfs.TrackerServer;
public class FastDFSClient {
  private TrackerClient trackerClient = null;
  private TrackerServer trackerServer = null;
  private StorageServer storageServer = null;
  private StorageClient1 storageClient = null;
  public FastDFSClient(String conf) throws Exception {
  if (conf.contains("classpath:")) {
    conf = conf.replace("classpath:", this.getClass().getResource("/").getPath());
  }
  ClientGlobal.init(conf);
  trackerClient = new TrackerClient();
  trackerServer = trackerClient.getConnection();
  storageServer = null;
  storageClient = new StorageClient1(trackerServer, storageServer);
  }
  /**
  * 上传文件方法
  * <p>Title: uploadFile</p>
  * <p>Description: </p>
  * @param fileName 文件全路径
  * @param extName 文件扩展名，不包含（.）
  * @param metas 文件扩展信息
  * @return
  * @throws Exception
  */
  public String uploadFile(String fileName, String extName, NameValuePair[] metas) throws Exception {
  String result = storageClient.upload_file1(fileName, extName, metas);
  return result;
  }
  public String uploadFile(String fileName) throws Exception {
  return uploadFile(fileName, null, null);
  }
  public String uploadFile(String fileName, String extName) throws Exception {
  return uploadFile(fileName, extName, null);
  }
  /**
  * 上传文件方法
  * <p>Title: uploadFile</p>
  * <p>Description: </p>
  * @param fileContent 文件的内容，字节数组
  * @param extName 文件扩展名
  * @param metas 文件扩展信息
  * @return
  * @throws Exception
  */
  public String uploadFile(byte[] fileContent, String extName, NameValuePair[] metas) throws Exception {
  String result = storageClient.upload_file1(fileContent, extName, metas);
  return result;
  }
  public String uploadFile(byte[] fileContent) throws Exception {
  return uploadFile(fileContent, null, null);
  }
  public String uploadFile(byte[] fileContent, String extName) throws Exception {
  return uploadFile(fileContent, extName, null);
  }
}

import entity.Result;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import util.FastDFSClient;
@RestController
public class UploadController {
    @Value("${FILE_SERVER_URL}")
    private String file_server_url;
    @RequestMapping("/upload")
    public Result upload(MultipartFile file) {
        String originalFilename = file.getOriginalFilename();//获取文件名
        String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);//得到扩展名
        try {
            util.FastDFSClient client = new FastDFSClient("classpath:config/fdfs_client.conf");
            String fileId = client.uploadFile(file.getBytes(), extName);
            String url = file_server_url + fileId;//图片完整地址
            return new Result(true, url);
        } catch (Exception e) {
            e.printStackTrace();
            return new Result(false, "上传失败");
        }
    }
}