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支持Fast DFS、服务器、OSS等上传方式

介绍

在实际的业务中，可以根据客户的需求设置不同的文件上传需求，支持普通服务器上传+分布式上传（Fast DFS）+云服务上传OSS（OSS）

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软件架构

为了方便演示使用，本项目使用的是前后端不分离的架构

前端：Jquery.uploadFile

后端：SpringBoot

前期准备：FastDFS、OSS（华为）、服务器

实现逻辑

通过 application 配置对上传文件进行一个自定义配置，从而部署在不同客户环境可以自定义选择方式。

优点：

1. 一键切换；
2. 支持当前主流方式；

缺点：

1. 迁移数据难度增加：因为表示FileID在对象存储和服务器上传都是生成的UUID，而FastDFS是返回存取ID，当需要迁移的时候，通过脚本可以快速将FastDFS的数据迁移上云，因为存储ID可以共用。但是对象存储和服务器上传的UUID无法被FastDFS使用，增加迁移成本

核心代码

package com.example.file.util;

import com.example.file.common.ResultBean;
import com.github.tobato.fastdfs.domain.StorePath;
import com.github.tobato.fastdfs.proto.storage.DownloadByteArray;
import com.github.tobato.fastdfs.service.FastFileStorageClient;
import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.DeleteObjectRequest;
import com.obs.services.model.GetObjectRequest;
import com.obs.services.model.ObsObject;
import com.obs.services.model.PutObjectResult;
import io.micrometer.common.util.StringUtils;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.util.Objects;
import java.util.UUID;

@Slf4j
public class FileUtil {

    /**
     *
     * @param file 文件
     * @param uploadFlag 标识
     * @param uploadPath 上传路径
     * @param endPoint 域名
     * @param ak    ak
     * @param sk sk
     * @param bucketName 桶名字
     * @return fileId 用于下载
     */
    public static ResultBean uploadFile(MultipartFile file, String uploadFlag, String uploadPath,
                                        FastFileStorageClient fastFileStorageClient,
                                        String endPoint, String ak, String sk,
                                        String bucketName) {

        if (StringUtils.isBlank(uploadFlag)){
            ResultBean.error("uploadFlag is null");
        }
        switch (uploadFlag){
            case "fastDFS":
                return uploadFileByFastDFS(file,fastFileStorageClient);
            case "huaweiOOS":
                return uploadFileByHuaweiObject(file, endPoint, ak, ak, bucketName);
            case "server":
            default:
                return uploadFileByOrigin(file,uploadPath);
        }}

    /**
     * 上传文件fastDFS
     * @param file 文件名
     * @return
     */
    private static ResultBean uploadFileByFastDFS(MultipartFile file,FastFileStorageClient fastFileStorageClient){
        Long size=file.getSize();
        String fileName=file.getOriginalFilename();
        String extName=fileName.substring(fileName.lastIndexOf(".")+1);
        InputStream inputStream=null;
        try {
            inputStream=file.getInputStream();
            //1-上传的文件流 2-文件的大小 3-文件的后缀 4-可以不管他
            StorePath storePath=fastFileStorageClient.uploadFile(inputStream,size,extName,null);
            log.info("[uploadFileByFastDFS][FullPath]"+storePath.getFullPath());
            return ResultBean.success(storePath.getPath());
        }catch (Exception e){
            log.info("[ERROR][uploadFileByFastDFS]"+e.getMessage());
            return ResultBean.error(e.getMessage());
        }finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 对象存储上传
     * @param file 文件名
     * @return
     */
    private static ResultBean uploadFileByHuaweiObject(MultipartFile file, String huaweiEndPoint,String huaweiobsAk,String huaweiobsSk,
                                                   String bucketName){
        String fileName = file.getOriginalFilename();
        fileName = renameToUUID(fileName);
        InputStream inputStream=null;
        try {
            inputStream=file.getInputStream();
            // 创建ObsClient实例
            ObsClient obsClient = new ObsClient(huaweiobsAk, huaweiobsSk, huaweiEndPoint);
            PutObjectResult result = obsClient.putObject(bucketName, fileName, inputStream);
            obsClient.close();
            return ResultBean.success(fileName);
        }catch (ObsException e){
            log.info("[ERROR][uploadFileByHuaweiObject]"+e.getErrorMessage());
            return ResultBean.error(e.getErrorMessage());
        }catch (Exception e){
            log.info("[ERROR][uploadFileByHuaweiObject]"+e.getMessage());
            return ResultBean.error(e.getMessage());
        }finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 上传文件原本方法
     * @param file 文件名
     * @return
     */
    private static ResultBean uploadFileByOrigin(MultipartFile file,String uploadPath){
        String fileName = file.getOriginalFilename();
        fileName = renameToUUID(fileName);
        File targetFile = new File(uploadPath);
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(uploadPath + fileName);
            out.write(file.getBytes());
        } catch (IOException e) {
            log.info("[ERROR][uploadFileByOrigin]"+e.getMessage());
            return ResultBean.error(e.getMessage());
        }finally {
            try {
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return ResultBean.success(fileName);
    }
    /**
     * 下载
     * @return
     */
    public static byte[] downloadFile(String fileId,String uploadFlag,String uploadPath
            ,FastFileStorageClient fastFileStorageClient, String group,
                                      String endPoint,String ak,String sk,
                                      String bucketName) {
        byte[] result=null;
        switch (uploadFlag){
            case "fastDFS":
                result =downloadFileByFastDFS(fileId,fastFileStorageClient,group);
                break;
            case "huaweiOOS":
                result =downloadFileByHuaweiObject(fileId, endPoint, ak, sk, bucketName);
                break;
            case "server":
            default:
                String path2 = uploadPath + fileId;
                path2 = path2.replace("//", "/");
                result=downloadFileByOrigin(path2);
                break;
        }
        return result;

    }

    /**
     * 下载文件fastDFS
     * @param fileId 文件名
     * @return
     */
    private static byte[] downloadFileByFastDFS(String fileId,FastFileStorageClient fastFileStorageClient,
                                                String group){
        DownloadByteArray callback=new DownloadByteArray();
        byte[] group1s=null;
        try {
            group1s = fastFileStorageClient.downloadFile(group, fileId, callback);
        }catch (Exception e){
            log.info("[ERROR][downloadFileByFastDFS]"+e.getMessage());

        }
        return group1s;
    }

    /**
     * 下载文件对象存储
     * @param fileId 文件名
     * @return
     */
    private static byte[] downloadFileByHuaweiObject(String fileId, String huaweiEndPoint,String huaweiobsAk,String huaweiobsSk,
                                                     String bucketName){
        byte[] bytes =null;
        try {
            // 创建ObsClient实例
            ObsClient obsClient = new ObsClient(huaweiobsAk, huaweiobsSk, huaweiEndPoint);
            // 构造GetObjectRequest请求
            GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, fileId);
            // 执行下载操作
            ObsObject obsObject = obsClient.getObject(getObjectRequest);
            bytes = inputStreamToByteArray(obsObject.getObjectContent());
            // 关闭OBS客户端
            obsClient.close();
            return bytes;
        }catch (ObsException e){
            log.info("[ERROR][downloadFileByHuaweiObject]"+e.getErrorMessage());
        }catch (Exception e) {
            log.info("[ERROR][downloadFileByHuaweiObject]"+e.getMessage());
        }
        return bytes;
    }

    /**
     *
     * @param input
     * @return
     * @throws IOException
     */
    private static byte[] inputStreamToByteArray(InputStream input) throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[4096];
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
        }
        return output.toByteArray();
    }

    /**
     * 下载文件
     * @param fileId 文件名
     * @return
     */
    private static byte[] downloadFileByOrigin(String fileId){
        File file  =new File(fileId);
        InputStream inputStream=null;
        byte[] buff = new byte[1024];
        byte[] result=null;
        BufferedInputStream bis = null;
        ByteArrayOutputStream os = null;
        try {
            os=new ByteArrayOutputStream();
            bis = new BufferedInputStream(new FileInputStream(file));
            int i = bis.read(buff);
            while (i != -1) {
                os.write(buff, 0, buff.length);
                i = bis.read(buff);
            }
            result=os.toByteArray();
            os.flush();
        } catch (Exception e) {
            log.info("[ERROR][downloadFile]"+e.getMessage());
        }finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }

    /**
     * 删除文件
     * @param fileId 文件ID
     * @return 删除失败返回-1，否则返回0
     */
    public static boolean deleteFile(String fileId,String fastDFSFlag,FastFileStorageClient fastFileStorageClient,
                                     String group,String uploadPath) {
        boolean result=false;
        if (StringUtils.isNotBlank(fastDFSFlag)&&
                fastDFSFlag.trim().equalsIgnoreCase("true")){
            result =deleteFileByFastDFS(fileId,fastFileStorageClient,group);
        }else {
            String path2 = uploadPath + fileId;
            path2 = path2.replace("//", "/");
            result=deleteByOrigin(path2);
        }
        return result;
    }
    private static boolean deleteByOrigin(String fileName) {
        File file = new File(fileName);
        // 如果文件路径所对应的文件存在，并且是一个文件，则直接删除
        if (file.exists() && file.isFile()) {
            if (file.delete()) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

    private static boolean deleteFileByFastDFS(String fileId,FastFileStorageClient fastFileStorageClient,
                                               String group) {
        try {
            String groupFieId=group+"/"+fileId;
            StorePath storePath = StorePath.praseFromUrl(groupFieId);
            fastFileStorageClient.deleteFile(storePath.getGroup(), storePath.getPath());
        } catch (Exception e) {
            log.info("[ERROR][deleteFileByFastDFS]"+e.getMessage());
            return false;
        }
        return true;
    }

    /**
     * 生成fileId
     * @param fileName
     * @return
     */
    private static String renameToUUID(String fileName) {
        return UUID.randomUUID() + "." + fileName.substring(fileName.lastIndexOf(".") + 1);
    }

    /**
     * 删除文件对象存储
     * @param fileId 文件名
     * @return
     */
    private static boolean deleteFileByHuaweiObject(String fileId, String huaweiEndPoint,String huaweiobsAk,String huaweiobsSk,
                                                    String bucketName){
        try {
            // 创建ObsClient实例
            ObsClient obsClient = new ObsClient(huaweiobsAk, huaweiobsSk, huaweiEndPoint);
            // 构造GetObjectRequest请求
            DeleteObjectRequest getObjectRequest = new DeleteObjectRequest(bucketName, fileId);

            // 执行删除操作
            obsClient.deleteObject(getObjectRequest);
            // 关闭OBS客户端
            obsClient.close();
        }catch (ObsException e){
            log.info("[ERROR][deleteFileByHuaweiObject]"+e.getErrorMessage());
        }catch (Exception e) {
            log.info("[ERROR][downloadFileByHuaweiObject]"+e.getMessage());
        }
        return true;
    }

    /**
     * 文件数据输出(image)
     * @param fileId
     * @param bytes
     * @param res
     */
    public static void fileDataOut(String fileId, byte[] bytes, HttpServletResponse res){

        String[] prefixArray = fileId.split("\\.");
        String prefix=prefixArray[1];
        File file  =new File(fileId);

        res.reset();
        res.setCharacterEncoding("utf-8");
//        res.setHeader("content-type", "");
        res.addHeader("Content-Length", "" + bytes.length);
        if(prefix.equals("svg"))
            prefix ="svg+xml";
        res.setContentType("image/"+prefix);
        res.setHeader("Accept-Ranges","bytes");
        OutputStream os = null;

        try {
//            os = res.getOutputStream();
//            os.write(bytes);
//            os.flush();
            res.getOutputStream().write(bytes);
        } catch (IOException e) {
            System.out.println("not find img..");
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

}

参考资料

假设个人实战使用可以采用docker快速安装，但是未安装过FastDFS建议普通安装部署，了解一下tracker和storage的使用，以及部署搭建集群。

FastDFS普通安装部署：https://www.cnblogs.com/chenliugou/p/15322389.html

FasdDFS docker安装部署：https://blog.csdn.net/weixin_44621343/article/details/117825755?utm_medium=distribute.pc_relevant.none-task-blog-2_defaultbaidujs_baidulandingword~default-0-117825755-blog-127896984.235^v43pc_blog_bottom_relevance_base6&spm=1001.2101.3001.4242.1&utm_relevant_index=3

OpenFeign和FastDFS的类冲突：https://www.cnblogs.com/chenliugou/p/18113183

Gitee地址：https://gitee.com/chen-liugou/file/new/master?readme=true

文章来源:https://www.cnblogs.com/chenliugou/p/18121894
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