使用Spring Boot集成FastDFS的示例代码

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 = 60network_timeout = 60charset = UTF-8http.tracker_http_port = 8080http.anti_steal_token = nohttp.secret_key = 123456tracker_server = 192.168.53.85:22122tracker_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 4.3public 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 somewhere    String 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

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