使用Spring Boot集成FastDFS的示例代碼

這篇文章我們介紹如何使用Spring Boot將文件上傳到分佈式文件系統FastDFS中。

這個項目會在上一個項目的基礎上進行構建。

1、pom包配置

我們使用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，用來調用FastDFS相關的API。

2、配置文件

resources目錄下添加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

配置文件設置了連接的超時時間，編碼格式以及tracker_server地址等信息

詳細內容參考：fastdfs-client-java

3、封裝FastDFS上傳工具類

封裝FastDFSFile，文件基礎信息包括文件名、內容、文件類型、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

封裝FastDFSClient類，包含常用的上傳、下載、刪除等方法。

首先在類加載的時候讀取相應的配置信息，並進行初始化。

 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); }}

文件上傳

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提供的客戶端storageClient來進行文件上傳，最後將上傳結果返回。

根據groupName和文件名獲取文件信息。

 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;}

下載文件

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;}

刪除文件

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時，直接調用FastDFSClient對應的方法即可。

4、編寫上傳控制類

從MultipartFile中讀取文件信息，然後使用FastDFSClient將文件上傳到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;}

請求控制，調用上面方法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";}

上傳成功之後，將文件的路徑展示到頁面，效果圖如下：

在瀏覽器中訪問此Url，可以看到成功通過FastDFS展示：

這樣使用Spring Boot 集成FastDFS的案例就完成了。

示例代碼-github

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。