FastDFS操作文件上传，下载，删除

FastDFS是一个开源的轻量级分布式文件系统，它对文件进行管理，功能包括：文件存储、文件同步、文件访问（文件上传、文件下载）等，解决了大容量存储和负载均衡的问题。特别适合以文件为载体的在线服务，如相册网站、视频网站等等。 -----《百度百科》

最近有在项目里面使用到FastDFS，于是在这里做个记录，以便后续使用查看，至于FastDfs的配置，我会专门出一篇文章进行记录，这里不再赘述。
以下是我写的一个简单的工具类，用于做文件的上传，下载，删除等基础功能。
我们首先需要在SpringBoot项目里面集成FastDFS:

• 添加Maven依赖

<dependency>
			<groupId>com.github.tobato</groupId>
			<artifactId>fastdfs-client</artifactId>
			<version>1.26.1-RELEASE</version>
			<--! 加入fastdfs的依赖之后会和spring的logback冲突，产生了依赖冲突。
             解决办法：在fastdfs的依赖中排除自身的logback依赖。当然，如果你的项目里面没有集成logback，可能不需要加这个-->
			<exclusions>
				<exclusion>
					<groupId>ch.qos.logback</groupId>
					<artifactId>logback-classic</artifactId>
				</exclusion>
			</exclusions>
		</dependency>

• 在yml文件里面配置FastDFS的参数

fdfs:
  soTimeout: 1500
  connectTimeout: 600
  thumbImage:             #缩略图生成参数
    width: 150
    height: 150
  trackerList:            #TrackerList参数,支持多个
    - 192.168.x.xxx:22122
  resHost: http://192.168.xxx/
  storagePort: 8888

• 添加Fast DFS的配置类

@Configuration
@Import(FdfsClientConfig.class)
@EnableMBeanExport(registration = RegistrationPolicy.IGNORE_EXISTING)
public class FdfsClientConf {
}

• 编写FastDFS工具类

/**
	 * 
	 * @description file upload of type Mutilpart
	 * @author feifei.yuan
	 * @param file: the file will to be uploaded
	 * @return String
	 * @throws IOException
	 * @date Aug 27, 2020 10:30:26 AM
	 */
	public    String upLoadFile(MultipartFile file) {
		StorePath storePath = null;
		try {
			storePath = storageClient.uploadFile(file.getInputStream(), file.getSize(),
					FilenameUtils.getExtension(file.getOriginalFilename()), null);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return getResAccessUrl(storePath);
	}

	/**
	 * 
	 * @description normal file upload
	 * @author feifei.yuan
	 * @param file : the file to be uploaded
	 * @return String
	 * @throws FileNotFoundException
	 * @date Aug 27, 2020 10:31:08 AM
	 */
	public  String upLoadFile(File file) {
		InputStream inputStream;
		StorePath storePath = null;
		try {
			inputStream = new FileInputStream(file);
			storePath = storageClient.uploadFile(inputStream, file.length(), FilenameUtils.getExtension(file.getName()),
					null);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		return getResAccessUrl(storePath);
	}

	

	

	/**
	 * 
	 * @description return the address of the uploaded file
	 * @author feifei.yuan
	 * @param storePath
	 * @return String
	 * @date Aug 27, 2020 10:32:32 AM
	 */
	public  String getResAccessUrl(StorePath storePath) {
		String fileUrl = storePath.getFullPath();
		return fileUrl;
	}

	/*
	 * why the next tow  functions need to add lock?
	 * <p>
	 * In the case of concurrency, deleting files and downloading files will cause IO exceptions
	 * <p>
	 * 
	 * <p>
	 * There is no high concurrency problem here, but it may be due to network reasons 
	 * or the file download or delete time is too long, the last operation has not been completed,
	 * the next operation is coming, at this time you need to lock to ensure that there is 
	 * no concurrency security
	 * <p>
	 * <p>
	 * Don't ask me why I know, I just know.
	 * <p>
	 */
	
	
	/**
	 * 
	 * @description delete the file based the given fileUrl
	 * @author feifei.yuan
	 * @param fileUrl: the file will be deleted on the fastdfs server path
	 * @return void
	 * @date Aug 27, 2020 10:32:47 AM
	 */
	public synchronized  void  deleteFile(String fileUrl) {
		if (StringUtils.isEmpty(fileUrl))
			return;
		StorePath storePath = StorePath.praseFromUrl(fileUrl);
		
		storageClient.deleteFile(storePath.getGroup(), storePath.getPath());
	}

	
	/**
	 * 
	 * @description  download file form fastdfs
	 * @author       fefei.yuan
	 * @param        group:   the fastdfs group 
	 *               path:    the file path 
	 * @return       byte[]    
	 * @date         Aug 28, 2020 5:37:28 PM
	 */
	public void   downLoadFile(HttpServletResponse response, String fileUrl, String fileName) {
		ReentrantLock lock = new ReentrantLock();
		lock.lock();
		byte[] bs = null;
		try {
			response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
			StorePath storePath = StorePath.praseFromUrl(fileUrl);
			bs = storageClient.downloadFile(storePath.getGroup(), storePath.getPath(), new DownloadByteArray());
			response.getOutputStream().write(bs);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			lock.unlock();
		}
	}

非非也是第一次使用FastDFS，里面踩了很多坑呢，希望我写的文章可以帮助到大家少踩坑，后续我会出一篇FastDFS+Nginx+FastDFS_Nginx_Moudle的服务器配置，大家敬请期待。

码字不易，动动你们的小手指，给非非一个赞吧，你们的给力就是我写作的动力，我是袁非非！！！

最后

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