文件服务器FastDFS

FastDFS可用于分布式系统环境中自行搭建文件服务器，可以达到服务器资源动静分离，请求分流的效果。本篇简单概述下其使用方法。

准备工作：

1. 搭建springboot脚手架并成功运行，可参考历史分享springboot+mybatis

2. 启动FastDFS服务(tracker, storage及nginx)（搭建配置FastDFS服务，后续会在运维章节另行讲述）

   

1. maven添加FastDFS client依赖

<dependency>    <groupId>com.github.tobato</groupId>    <artifactId>fastdfs-client</artifactId>    <version>1.26.7</version></dependency>

2.FastDFS配置

2.1 yml

fdfs:  # 文件下载拉取地址  web-server-url: https://img.xxx.com  so-timeout: 3000  connect-timeout: 1200  thumb-image: # 缩略图    width: 60    height: 60  tracker-list: 192.168.2.9:22122  pool:    jmx-enabled: false #禁止JMX重复注册，影响springboot JMX监控

2.2 FastDFS client config‍

import com.github.tobato.fastdfs.FdfsClientConfig;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Import;​@Import({FdfsClientConfig.class})@SpringBootApplicationpublic class FdfsApplication {
   ​    public static void main(String[] args) {
           SpringApplication.run(FdfsApplication.class, args);    }​}

3.FastDFS使用

3.1 fdfs util

import com.github.tobato.fastdfs.domain.fdfs.StorePath;import com.github.tobato.fastdfs.exception.FdfsUnsupportStorePathException;import com.github.tobato.fastdfs.exception.FdfsUploadImageException;import com.github.tobato.fastdfs.service.FastFileStorageClient;import lombok.extern.slf4j.Slf4j;import net.coobird.thumbnailator.Thumbnails;import org.apache.commons.io.FilenameUtils;import org.apache.commons.io.IOUtils;import org.apache.commons.lang3.StringUtils;import org.springframework.web.multipart.MultipartFile;​import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.*;import java.util.Arrays;import java.util.List;import java.util.UUID;​/** * @author Bruce * @date 2021/3/12 */@Slf4jpublic final class FdfsUtil {
   ​    private static final List<String> IMAGE_TYPE = 
            Arrays.asList("jpg", "jpeg", "png", "bmp", "tif", "gif", "webp");    private static final List<String> VIDEO_TYPE = Arrays.asList("mp4", "avi");    private static final String IMG_LINUX_LOCATION = "/usr/local/data/img";​    /**     * 前端 文件上传     * @param fastFileStorageClient     * @param file     * @param imageServer     * @param needThumbnail     * @param needSize     * @return     * @throws IOException     */    public static UploadFile upload(FastFileStorageClient fastFileStorageClient, 
                                    MultipartFile file, String imageServer, 
                                    Byte needThumbnail, Byte needSize) 
                                    throws IOException {
           UploadFile uploadFile = new UploadFile(
                  file.getOriginalFilename(), file.getSize(), file.getContentType());​        uploadFile(fastFileStorageClient, file.getInputStream(), 
                   uploadFile, imageServer, needThumbnail, needSize);        return uploadFile;    }​    /**     * 后端 文件上传     * @param fastFileStorageClient     * @param file     * @param imageServer     * @param needThumbnail     * @param needSize     * @return     */    public static UploadFile upload(FastFileStorageClient fastFileStorageClient, 
                                    File file, String imageServer, 
                                    Byte needThumbnail, Byte needSize) {
           try (InputStream is = new FileInputStream(file)) {
               UploadFile uploadFile = new UploadFile(
                       file.getName(), file.length(), null);​            uploadFile(fastFileStorageClient, is, uploadFile, 
                       imageServer, needThumbnail, needSize);​            return uploadFile;        } catch (Exception e){
               throw new CommonException("上传文件失败", e);        }    }​    /**     * 上传文件，处理图片     * @param fastFileStorageClient     * @param inputStream     * @param uploadFile     * @param imageServer     * @param needThumbnail     * @param needSize     * @throws IOException     */    private static void uploadFile(FastFileStorageClient fastFileStorageClient, 
                                   InputStream inputStream, UploadFile uploadFile, 
                                   String imageServer, Byte needThumbnail, 
                                   Byte needSize) throws IOException {
           log.info("文件上传 originalFileName={}, fileSize={}", 
                 uploadFile.getOriginalFilename(), uploadFile.getFileSize());​        // 获取文件后缀        String fileExtName = FilenameUtils.getExtension(
                             uploadFile.getOriginalFilename()).toLowerCase();​        // 限制图片文件上传大小        if(isSupportType(fileExtName)){
               validateUploadImage(uploadFile, fileExtName);        }​        // 缓存文件流        byte[] fileStream = IOUtils.toByteArray(inputStream);​        // 上传原图或文件        uploadOrigFile(fastFileStorageClient, uploadFile, 
                      imageServer, fileStream, fileExtName);​        // 上传图片缩略图        if(isSupportType(fileExtName)){
               uploadImageThumbnails(fastFileStorageClient, uploadFile, 
                  imageServer, fileStream, fileExtName, needThumbnail, needSize);        }​        log.info("上传文件地址={}", uploadFile.getFullFilename());    }​    /**     * 限制图片文件上传大小     * @param uploadFile     * @param fileExtName     */    private static void validateUploadImage(UploadFile uploadFile, 
                                            String fileExtName){
           // gif文件，大小校验，超过4兆，不上传        if("gif".equals(fileExtName)){
               if(uploadFile.getFileSize() > 4 * 1024 * 1024){
                   throw new CommonException("GIF动图大小不能超过4M");            }        } else if(VIDEO_TYPE.contains(fileExtName)){
               if(uploadFile.getFileSize() > 40 * 1024 * 1024){
                   throw new CommonException("视频大小不能超过40M");            }        } else{
               // 普通图片文件不能超过10M            if(uploadFile.getFileSize() > 10 * 1024 * 1024){
                   throw new CommonException("上传单张图片不能超过10M");            }        }    }​    /**     * 上传原文件     * @param fastFileStorageClient     * @param uploadFile     * @param imageServer     * @param fileStream     * @param fileExtName     */    private static void uploadOrigFile(FastFileStorageClient fastFileStorageClient, 
                                       UploadFile uploadFile, String imageServer,                                       byte[] fileStream, String fileExtName){
           try (ByteArrayInputStream is = new ByteArrayInputStream(fileStream)) {
               StorePath originalStorePath = fastFileStorageClient.uploadFile(
                      is, uploadFile.getFileSize(), fileExtName, null);            uploadFile.setFullFilename(imageServer.concat("/").concat(
                       originalStorePath.getFullPath()));        } catch (IOException e) {
               log.error("upload Image error", e.getCause());            throw new FdfsUploadImageException("upload Image error", e.getCause());        }    }​    /**     * 上传图片缩略图     * @param fastFileStorageClient     * @param uploadFile     * @param imageServer     * @param fileStream     * @param fileExtName     * @param needThumbnail     * @param needSize     * @throws IOException     */    private static void uploadImageThumbnails(
                                        FastFileStorageClient fastFileStorageClient, 
                                        UploadFile uploadFile, String imageServer,
                                        byte[] fileStream, String fileExtName, 
                                        Byte needThumbnail, Byte needSize) 
                                        throws IOException {
           // 默认图片缩略图取原图        uploadFile.setThumbnail(uploadFile.getFullFilename());        // 缩略图也需要计算图片尺寸大小        if(Constant.YES.equals(needSize) || Constant.YES.equals(needThumbnail)){
               // 获取图片尺寸            BufferedImage bufferedImage = ImageIO.read(new ByteArrayInputStream(
                                          fileStream));​            if(bufferedImage != null){
                   uploadFile.setWidth(bufferedImage.getWidth());                uploadFile.setHeight(bufferedImage.getHeight());​                // 压缩处理                if(Constant.YES.equals(needThumbnail)){
                       InputStream is = null;                    try {
                           ByteArrayOutputStream out = new ByteArrayOutputStream();                        float outputQuality = getOutputQuality(
                                               uploadFile.getFileSize());                        if(!"jpg".equals(fileExtName)){
                               // 先转成jpg                            String newPicPath = IMG_LINUX_LOCATION + File.separator 
                                             + UUID.randomUUID().toString() + ".jpg";                            Thumbnails.of(new ByteArrayInputStream(fileStream))
                                                  .scale(1f).toFile(newPicPath);                            // 原比例不变，大小压缩                            Thumbnails.of(newPicPath).scale(1f)
                                  .outputQuality(outputQuality).toOutputStream(out);                            // 删除jpg图片                            new File(newPicPath).delete();                        } else {
                               Thumbnails.of(new ByteArrayInputStream(fileStream))
                                        .scale(1f).outputQuality(outputQuality)
                                        .toOutputStream(out);                        }                        is = new ByteArrayInputStream(out.toByteArray());​                        // 上传缩略图                        StorePath thumbnailStorePath = fastFileStorageClient
                          .uploadFile(is, is.available(), fileExtName, null);                        uploadFile.setThumbnail(imageServer.concat("/")
                            .concat(thumbnailStorePath.getFullPath()));​                        log.info("上传缩略图地址={}", uploadFile.getThumbnail());                    } catch (IOException e) {
                           log.error("upload ThumbImage error", e.getCause());                        throw new FdfsUploadImageException(
                                  "upload ThumbImage error",e.getCause());                    } finally {
                           IOUtils.closeQuietly(is);                    }                }            }        }    }​    /**     * 设置压缩比例     * @param fileSize     * @return     */    private static float getOutputQuality(long fileSize){
           if (fileSize < 64 * 1024) {
               return 1f;        } else if (fileSize < 256 * 1024) {
               return 0.4f;        } else if (fileSize < 2 * 1024 * 1024) {
               return 0.2f;        }​        return 0.1f;    }​    /**     * 判断文件格式是否支持     * @param fileExtName     * @return     */    private static boolean isSupportType(String fileExtName) {
           return IMAGE_TYPE.contains(fileExtName) || VIDEO_TYPE.contains(fileExtName);    }​    /**     * 删除文件     * @param fileUrl 文件访问地址     * @param fastFileStorageClient     */    public static void deleteFile(FastFileStorageClient fastFileStorageClient, 
                                                               String fileUrl) {
           if (StringUtils.isEmpty(fileUrl)) {
               return;        }        try {
               StorePath storePath = StorePath.parseFromUrl(fileUrl);            fastFileStorageClient.deleteFile(
                                storePath.getGroup(), storePath.getPath());        } catch (FdfsUnsupportStorePathException e) {
               log.warn("异常信息：", e);        }    }​}

3.2 前端上传文件API

import com.github.tobato.fastdfs.service.FastFileStorageClient;import io.swagger.annotations.Api;import io.swagger.annotations.ApiOperation;import lombok.extern.slf4j.Slf4j;import org.apache.commons.io.FilenameUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.http.MediaType;import org.springframework.http.ResponseEntity;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.multipart.MultipartFile;​import java.util.ArrayList;import java.util.List;​@Slf4j@RestController@RequestMapping("/fdfs")@Api(tags = "文件上传")public class FdfsController {
   ​    @Value("${fdfs.web-server-url}")    private String imageServer;​    @Autowired    private FastFileStorageClient fastFileStorageClient;​    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
                                    produces = MediaType.APPLICATION_JSON_VALUE)    @ApiOperation(value = "文件上传", httpMethod = "POST")    public String upload(@RequestParam("file") MultipartFile file,     @RequestParam(value = "needSize", defaultValue = "0") Byte needSize,     @RequestParam(value = "needThumbnail", defaultValue = "0") Byte needThumbnail) {
           try {
               long start = System.currentTimeMillis();​            // 获取文件后缀            String fileExtName = FilenameUtils.getExtension(
                                  file.getOriginalFilename()).toUpperCase();​            UploadFile uploadFile = FdfsUtil.upload(
                 fastFileStorageClient, file, imageServer, needThumbnail, needSize);​            long end = System.currentTimeMillis();​            log.info("文件上传耗时：{} 耗秒", (end - start));​             return JSON.toJSONString(uploadFile);        } catch (Exception e) {
               log.error("上传文件异常:", e);        }​        log.warn(String.format("文件 %s 上传失败", file.getOriginalFilename()));​        return "上传文件异常";    }​}

3.3 服务端上传文件

  @Value("${fdfs.web-server-url}")  private String imageServer;​  @Autowired  private FastFileStorageClient fastFileStorageClient;

  File file = new File("xxxx");  UploadFile uploadFile = FdfsUtil.upload(
                    fastFileStorageClient, file, imageServer, null, null);  String fileUrl = uploadFile.getFullFilename();  file.deleteOnExit();  return fileUrl;

4.FastDFS工作过程

  

client 连接请求FastDFS，需借助Nginx做http请求代理转发​。