使用Spring Boot集成FastDFS的示例代碼

更新時(shí)間：2018年02月01日 10:58:05 作者：純潔的微笑

本篇文章主要介紹了使用Spring Boot集成FastDFS的示例代碼，小編覺(jué)得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

這篇文章我們介紹如何使用Spring Boot將文件上傳到分布式文件系統(tǒng)FastDFS中。

這個(gè)項(xiàng)目會(huì)在上一個(gè)項(xiàng)目的基礎(chǔ)上進(jìn)行構(gòu)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(lái)調(diào)用FastDFS相關(guān)的API。

2、配置文件

resources目錄下添加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 = 123456

tracker_server = 192.168.53.85:22122
tracker_server = 192.168.53.86:22122

配置文件設(shè)置了連接的超時(shí)時(shí)間，編碼格式以及tracker_server地址等信息

詳細(xì)內(nèi)容參考：fastdfs-client-java

3、封裝FastDFS上傳工具類(lèi)

封裝FastDFSFile，文件基礎(chǔ)信息包括文件名、內(nèi)容、文件類(lèi)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(lèi)，包含常用的上傳、下載、刪除等方法。

首先在類(lèi)加載的時(shí)候讀取相應(yīng)的配置信息，并進(jìn)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(hù)端storageClient來(lái)進(jìn)行文件上傳，最后將上傳結(jié)果返回。

根據(jù)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(shí)，直接調(diào)用FastDFSClient對(duì)應(yīng)的方法即可。

4、編寫(xiě)上傳控制類(lèi)

從MultipartFile中讀取文件信息，然后使用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(qǐng)求控制，調(diào)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 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";
}

上傳成功之后，將文件的路徑展示到頁(yè)面，效果圖如下：