springboot(十八)：使用Spring Boot集成FastDFS

上篇文章介绍了如何使用Spring Boot上传文件，这篇文章我们介绍如何使用Spring Boot将文件上传到分布式文件系统FastDFS中。

这个项目会在上一个项目的基础上进行构建。

1、pom包配置

我们使用Spring Boot最新版本1.5.9、jdk使用1.8、tomcat8.0。

<dependency><groupId>org.csource</groupId><artifactId>fastdfs-client-java</artifactId><version>1.27-SNAPSHOT</version>
</dependency>

加入了fastdfs-client-java包，用来调用FastDFS相关的API。

2、配置文件

resources目录下添加fdfs_client.conf文件

connect_timeout = 60
network_timeout = 60
charset = UTF-8
http.tracker_http_port = 8080
http.anti_steal_token = no
http.secret_key = 123456tracker_server = 192.168.53.85:22122
tracker_server = 192.168.53.86:22122

配置文件设置了连接的超时时间，编码格式以及tracker_server地址等信息

详细内容参考：fastdfs-client-java

3、封装FastDFS上传工具类

封装FastDFSFile，文件基础信息包括文件名、内容、文件类型、作者等。

public class FastDFSFile {private String name;private byte[] content;private String ext;private String md5;private String author;//省略getter、setter

封装FastDFSClient类，包含常用的上传、下载、删除等方法。

首先在类加载的时候读取相应的配置信息，并进行初始化。

static {try {String filePath = new ClassPathResource("fdfs_client.conf").getFile().getAbsolutePath();;ClientGlobal.init(filePath);trackerClient = new TrackerClient();trackerServer = trackerClient.getConnection();storageServer = trackerClient.getStoreStorage(trackerServer);} catch (Exception e) {logger.error("FastDFS Client Init Fail!",e);}
}

文件上传

public static String[] upload(FastDFSFile file) {logger.info("File Name: " + file.getName() + "File Length:" + file.getContent().length);NameValuePair[] meta_list = new NameValuePair[1];meta_list[0] = new NameValuePair("author", file.getAuthor());long startTime = System.currentTimeMillis();String[] uploadResults = null;try {storageClient = new StorageClient(trackerServer, storageServer);uploadResults = storageClient.upload_file(file.getContent(), file.getExt(), meta_list);} catch (IOException e) {logger.error("IO Exception when uploadind the file:" + file.getName(), e);} catch (Exception e) {logger.error("Non IO Exception when uploadind the file:" + file.getName(), e);}logger.info("upload_file time used:" + (System.currentTimeMillis() - startTime) + " ms");if (uploadResults == null) {logger.error("upload file fail, error code:" + storageClient.getErrorCode());}String groupName = uploadResults[0];String remoteFileName = uploadResults[1];logger.info("upload file successfully!!!" + "group_name:" + groupName + ", remoteFileName:" + " " + remoteFileName);return uploadResults;
}

使用FastDFS提供的客户端storageClient来进行文件上传，最后将上传结果返回。

根据groupName和文件名获取文件信息。

public static FileInfo getFile(String groupName, String remoteFileName) {try {storageClient = new StorageClient(trackerServer, storageServer);return storageClient.get_file_info(groupName, remoteFileName);} catch (IOException e) {logger.error("IO Exception: Get File from Fast DFS failed", e);} catch (Exception e) {logger.error("Non IO Exception: Get File from Fast DFS failed", e);}return null;
}

下载文件

public static InputStream downFile(String groupName, String remoteFileName) {try {storageClient = new StorageClient(trackerServer, storageServer);byte[] fileByte = storageClient.download_file(groupName, remoteFileName);InputStream ins = new ByteArrayInputStream(fileByte);return ins;} catch (IOException e) {logger.error("IO Exception: Get File from Fast DFS failed", e);} catch (Exception e) {logger.error("Non IO Exception: Get File from Fast DFS failed", e);}return null;
}

删除文件

public static void deleteFile(String groupName, String remoteFileName)throws Exception {storageClient = new StorageClient(trackerServer, storageServer);int i = storageClient.delete_file(groupName, remoteFileName);logger.info("delete file successfully!!!" + i);
}

使用FastDFS时，直接调用FastDFSClient对应的方法即可。

4、编写上传控制类

从MultipartFile中读取文件信息，然后使用FastDFSClient将文件上传到FastDFS集群中。

public String saveFile(MultipartFile multipartFile) throws IOException {String[] fileAbsolutePath={};String fileName=multipartFile.getOriginalFilename();String ext = fileName.substring(fileName.lastIndexOf(".") + 1);byte[] file_buff = null;InputStream inputStream=multipartFile.getInputStream();if(inputStream!=null){int len1 = inputStream.available();file_buff = new byte[len1];inputStream.read(file_buff);}inputStream.close();FastDFSFile file = new FastDFSFile(fileName, file_buff, ext);try {fileAbsolutePath = FastDFSClient.upload(file);  //upload to fastdfs} catch (Exception e) {logger.error("upload file Exception!",e);}if (fileAbsolutePath==null) {logger.error("upload file failed,please upload again!");}String path=FastDFSClient.getTrackerUrl()+fileAbsolutePath[0]+ "/"+fileAbsolutePath[1];return path;
}

请求控制，调用上面方法saveFile()。

@PostMapping("/upload") //new annotation since 4.3
public String singleFileUpload(@RequestParam("file") MultipartFile file,RedirectAttributes redirectAttributes) {if (file.isEmpty()) {redirectAttributes.addFlashAttribute("message", "Please select a file to upload");return "redirect:uploadStatus";}try {// Get the file and save it somewhereString path=saveFile(file);redirectAttributes.addFlashAttribute("message","You successfully uploaded '" + file.getOriginalFilename() + "'");redirectAttributes.addFlashAttribute("path","file path url '" + path + "'");} catch (Exception e) {logger.error("upload file failed",e);}return "redirect:/uploadStatus";
}

上传成功之后，将文件的路径展示到页面，效果图如下：

在浏览器中访问此Url，可以看到成功通过FastDFS展示：

这样使用Spring Boot 集成FastDFS的案例就完成了。

示例代码-github

示例代码-码云

作者：纯洁的微笑
出处：www.ityouknow.com
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。

本文如对您有帮助，还请多帮 【推荐】 下此文。
如果喜欢我的文章，请关注我的公众号