分散ファイルストレージシステムFastDFSの使用

一、資料の参考

https://www.sohu.com/a/224411047_465959
https://blog.csdn.net/lonelymanontheway/article/details/80777849
https://www.cnblogs.com/hujunwei/p/11341614.html
https://www.cnblogs.com/ityouknow/p/8240976.html

https://github.com/happyfish100/fastdfs/wiki
https://www.cnblogs.com/handsomeye/p/9451568.html
springboot  fastDFS
https://www.cnblogs.com/felixzh/p/10721964.html
https://www.cnblogs.com/hujunwei/p/11341614.html

二、具体的なコード1 pomファイル構成(centerライブラリにはfastdfsのコードライブラリがないためgithubのコードをダウンロードしmavenローカルライブラリにアップロードする必要がある)

    
        org.csource
        fastdfs-client-java
        1.29-SNAPSHOT
    

②Controller

@RestController
@CrossOrigin
@RequestMapping(value = "sde/work/fastdfs/")
public class FileController {


    /**
     * @param groupName      ：group1(      traker,          ？？？？？)
     * @param remoteFileName   ：M00/00/00/Cqo6oF9GMf2AIEd9AABzjFPTGsI80..jpg
     * @return        
     */

    @GetMapping("/query")
    public FileInfo query(String groupName, String remoteFileName) {
        try {
            return FastDFSClient.getFile(groupName, remoteFileName);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    @PostMapping("/upload")
    public String upload(@RequestParam("file") MultipartFile file) {
        String path = "";
        try {
            path = FastDFSClient.saveFile(file);
            System.out.println(path);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return path;
    }
}

③Beanクラス

public class FastDFSFile {

    //    
    private String name;
    //    
    private byte[] content;
    //     
    private String ext;
    //  MD5   
    private String md5;
    //      
    private String author;

    public FastDFSFile(String name, byte[] content, String ext,
                        String author) {
        super();
        this.name = name;
        this.content = content;
        this.ext = ext;
        this.author = author;
    }

    public FastDFSFile(String name, byte[] content, String ext) {
        super();
        this.name = name;
        this.content = content;
        this.ext = ext;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public byte[] getContent() {
        return content;
    }

    public void setContent(byte[] content) {
        this.content = content;
    }

    public String getExt() {
        return ext;
    }

    public void setExt(String ext) {
        this.ext = ext;
    }

    public String getMd5() {
        return md5;
    }

    public void setMd5(String md5) {
        this.md5 = md5;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

④工具類

public class FastDFSClient {


    private static org.slf4j.Logger logger = LoggerFactory.getLogger(FastDFSClient.class);

    /***
     *      FastDFS TrackerServer  
     */
    static {
        try {
            Properties props = new Properties();
            props.put(ClientGlobal.PROP_KEY_TRACKER_SERVERS, "10.170.58.160:22122");
            ClientGlobal.initByProperties(props);
            logger.info("FastDFS Client Init success!");
        } catch (Exception e) {
            logger.error("FastDFS Client Init Fail!", e);
        }
    }


    /**
     *         MultipartFile    
     * @param multipartFile
     * @return
     * @throws IOException
     */
    public static String saveFile(MultipartFile multipartFile) throws IOException {
        //1.      
        String fileName = multipartFile.getOriginalFilename();
        //2.       
        byte[] content = multipartFile.getBytes();
        //3.        
        String ext = "";
        if (fileName != null && !"".equals(fileName)) {
            ext = fileName.substring(fileName.lastIndexOf("."));
        }
        //4.          
        FastDFSFile fastDFSFile = new FastDFSFile(fileName, content, ext,"lbing");
        //5.   
        String[] uploadResults = FastDFSClient.upload(fastDFSFile);
        //6.                 , uploadResults[0]   , uploadResults[1]        
        String path = FastDFSClient.getTrackerUrl() + uploadResults[0] + "/" + uploadResults[1];
        //7.   
        return path;
    }

    /***
     *     
     * @param file
     * @return
     */
    public static String[] upload(FastDFSFile file) {
        //       
        NameValuePair[] meta_list = new NameValuePair[1];
        meta_list[0] = new NameValuePair("author", file.getAuthor());

        //      
        String[] uploadResults = null;
        StorageClient storageClient = null;
        try {
            //  StorageClient     
            storageClient = getTrackerClient();

            /***
             *     
             * 1)      
             * 2)     
             * 3)    
             */
            uploadResults = storageClient.upload_file(file.getContent(), file.getExt(), meta_list);
        } catch (Exception e) {
            logger.error("Exception when uploadind the file:" + file.getName(), e);
        }

        if (uploadResults == null && storageClient != null) {
            logger.error("upload file fail, error code:" + storageClient.getErrorCode());
        }
        //    
        String groupName = uploadResults[0];
        //        
        String remoteFileName = uploadResults[1];

        return uploadResults;
    }

    /***
     *       
     * @param groupName:  
     * @param remoteFileName：       
     * @return
     */
    public static FileInfo getFile(String groupName, String remoteFileName) {
        try {
            StorageClient storageClient = getTrackerClient();
            return storageClient.get_file_info(groupName, remoteFileName);
        } catch (Exception e) {
            logger.error("Exception: Get File from Fast DFS failed", e);
        }
        return null;
    }

    /***
     *     
     * @param groupName
     * @param remoteFileName
     * @return
     */
    public static InputStream downFile(String groupName, String remoteFileName) {
        try {
            //  StorageClient
            StorageClient storageClient = getTrackerClient();

            //    
            byte[] fileByte = storageClient.download_file(groupName, remoteFileName);
            InputStream ins = new ByteArrayInputStream(fileByte);
            return ins;
        } catch (Exception e) {
            logger.error("Exception: Get File from Fast DFS failed", e);
        }
        return null;
    }

    /***
     *     
     * @param groupName
     * @param remoteFileName
     * @throws Exception
     */
    public static void deleteFile(String groupName, String remoteFileName)
            throws Exception {
        //  StorageClient
        StorageClient storageClient = getTrackerClient();

        //    
        int i = storageClient.delete_file(groupName, remoteFileName);
    }

    /***
     *   Storage 
     * @param groupName
     * @return
     * @throws IOException
     */
    public static StorageServer[] getStoreStorages(String groupName)
            throws IOException {
        //  TrackerClient
        TrackerClient trackerClient = new TrackerClient();
        //  TrackerServer
        TrackerServer trackerServer = trackerClient.getTrackerServer();
        //  Storage 
        try {
            return trackerClient.getStoreStorages(trackerServer, groupName);
        } catch (MyException e) {
            e.printStackTrace();
            return null;
        }
    }

    /***
     *   Storage  ,IP   
     * @param groupName
     * @param remoteFileName
     * @return
     * @throws IOException
     */
    public static ServerInfo[] getFetchStorages(String groupName,
                                                String remoteFileName) throws IOException {

        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getTrackerServer();
        try {
            return trackerClient.getFetchStorages(trackerServer, groupName, remoteFileName);
        } catch (MyException e) {
            e.printStackTrace();
            return null;
        }
    }

    /***
     *   Tracker    
     * @return
     * @throws IOException
     */
    public static String getTrackerUrl() throws IOException {
        return "http://" + getTrackerServer().getInetSocketAddress().getHostString() + ":" + ClientGlobal.getG_tracker_http_port() + "/";
    }

    /***
     *   Storage   
     * @return
     * @throws IOException
     */
    private static StorageClient getTrackerClient() throws IOException {
        TrackerServer trackerServer = getTrackerServer();
        StorageClient storageClient = new StorageClient(trackerServer, null);
        return storageClient;
    }

    /***
     *   Tracker
     * @return
     * @throws IOException
     */
    private static TrackerServer getTrackerServer() throws IOException {
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getTrackerServer();
        return trackerServer;
    }

}