手动搭建FastDFS

FastDFS体系结构

FastDFS是一个开源的轻量级分布式文件系统，它对文件进行管理，功能包括：文件存储、文件同步、文件访问（文件上传、文件下载）等，解决了大容量存储和负载均衡的问题。特别适合以文件为载体的在线服务，如相册网站、视频网站等等。FastDFS为互联网量身定制，充分考虑了冗余备份、负载均衡、线性扩容等机制，并注重高可用、高性能等指标，使用FastDFS很容易搭建一套高性能的文件服务器集群提供文件上传、下载等服务。

1.FastDFS搭建
我们使用Docker搭建FastDFS的开发环境
1.1 拉取镜像

docker pull morunchang/fastdfs

1.2 运行tracker

docker run -d --name tracker --net=host morunchang/fastdfs sh tracker.sh

1.3 运行storage

docker run -d --name storage --net=host -e TRACKER_IP=<your tracker server address>:22122 -e GROUP_NAME=<group name> morunchang/fastdfs sh storage.sh

• 使用的网络模式是–net=host, 替换为你机器的Ip即可
• 是组名，即storage的组
• 如果想要增加新的storage服务器，再次运行该命令，注意更换 新组名

2.1 修改nginx的配置
2.2 进入storage的容器内部，修改nginx.conf

docker exec -it storage /bin/bash

2.3 进入后

vi /data/nginx/conf/nginx.conf

2.4 添加以下内容

location /group1/M00 {
    proxy_next_upstream http_502 http_504 error timeout invalid_header;
        proxy_cache http‐cache;
        proxy_cache_valid 200 304 12h;
        proxy_cache_key $uri$is_args$args;
        proxy_pass http://fdfs_group1;
        expires 30d;
}

2.5 退出容器

docker restart storage

3.1 引入依赖

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>net.oschina.zcx7878</groupId>
<artifactId>fastdfs-client-java</artifactId>
<version>1.27.0.0</version>
</dependency>
<dependency>
<groupId>com.changgou</groupId>
<artifactId>changgou_common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>

3.2 fasfDFS的配置文件 fdfs_client.conf

connect_timeout = 60
network_timeout = 60
charset = UTF‐8
http.tracker_http_port = 8080
tracker_server = 192.168.200.128:22122

connect_timeout：连接超时时间，单位为秒。
network_timeout：通信超时时间，单位为秒。发送或接收数据时。假设在超时时间后还不能发送或接收数据，则本次网络通信失败
charset： 字符集
http.tracker_http_port ：.tracker的http端口
tracker_server： tracker服务器IP和端口设置

3.4 创建启动类FileApplication

@SpringBootApplication
@EnableEurekaClient
public class FileApplication {
    public static void main(String[] args) {
        SpringApplication.run(FileApplication.class);
    }
}

4.文件上传
4.1 文件信息封装
文件上传一般都有文件的名字、文件的内容、文件的扩展名、文件的md5值、文件的作
者等相关属性，我们可以创建一个对象封装这些属性，代码如下：

public class FastDFSFile {
    //文件名字
    private String name;
    //文件内容
    private byte[] content;
    //文件扩展名
    private String ext;
    //文件MD5摘要值
    private String md5;
    //文件创建作者
    private String author;

    public FastDFSFile(String name, byte[] content, String ext, String height,
                       String width, 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;
    }
}

4.2 文件操作
创建FastDFSClient类,在该类中实现FastDFS信息获取以及文件的相关操作，代码如下：

public class FastDFSClient {

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

    /***
     * 初始化加载FastDFS的TrackerServer配置
     */
    static {
        try {
            String filePath = new ClassPathResource("fdfs_client.conf").getFile().getAbsolutePath();
            ClientGlobal.init(filePath);
        } catch (Exception e) {
            logger.error("FastDFS Client Init Fail!",e);
        }
    }

    /***
     * 文件上传
     * @param file
     * @return 1.文件的组名  2.文件的路径信息
     */
    public static String[] upload(FastDFSFile file) {
        //获取文件的作者
        NameValuePair[] meta_list = new NameValuePair[1];
        meta_list[0] = new NameValuePair("author", file.getAuthor());

        //接收返回数据
        String[] uploadResults = null;
        StorageClient storageClient=null;
        try {
            //创建StorageClient客户端对象
            storageClient = getTrackerClient();

            /***
             * 文件上传
             * 1)文件字节数组
             * 2)文件扩展名
             * 3)文件作者
             */
            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());
        }
        //获取组名
        String groupName = uploadResults[0];
        //获取文件存储路径
        String remoteFileName = uploadResults[1];
        return uploadResults;
    }

    /***
     * 获取文件信息
     * @param groupName:组名
     * @param remoteFileName：文件存储完整名
     * @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;
    }

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

            //下载文件
            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;
    }

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

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

    /***
     * 获取Storage组
     * @param groupName
     * @return
     * @throws IOException
     */
    public static StorageServer[] getStoreStorages(String groupName)
            throws IOException {
        //创建TrackerClient
        TrackerClient trackerClient = new TrackerClient();
        //获取TrackerServer
        TrackerServer trackerServer = trackerClient.getConnection();
        //获取Storage组
        return trackerClient.getStoreStorages(trackerServer, groupName);
    }

    /***
     * 获取Storage信息,IP和端口
     * @param groupName
     * @param remoteFileName
     * @return
     * @throws IOException
     */
    public static ServerInfo[] getFetchStorages(String groupName,
                                                String remoteFileName) throws IOException {
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getConnection();
        return trackerClient.getFetchStorages(trackerServer, groupName, remoteFileName);
    }

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

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

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

4.3 文件上传的实现

@RestController
@RequestMapping("/file")
public class FileController {

    @PostMapping("/upload")
    public Result uploadFile(MultipartFile file){
        try{
            //判断文件是否存在
            if (file == null){
                throw new RuntimeException("文件不存在");
            }
            //获取文件的完整名称
            String originalFilename = file.getOriginalFilename();
            if (StringUtils.isEmpty(originalFilename)){
                throw new RuntimeException("文件不存在");
            }

            //获取文件的扩展名称  abc.jpg   jpg
            String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);

            //获取文件内容
            byte[] content = file.getBytes();

            //创建文件上传的封装实体类
            FastDFSFile fastDFSFile = new FastDFSFile(originalFilename,content,extName);

            //基于工具类进行文件上传,并接受返回参数  String[]
            String[] uploadResult = FastDFSClient.upload(fastDFSFile);

            //封装返回结果
            String url = FastDFSClient.getTrackerUrl()+uploadResult[0]+"/"+uploadResult[1];
            return new Result(true,StatusCode.OK,"文件上传成功",url);
        }catch (Exception e){
            e.printStackTrace();
        }
        return new Result(false, StatusCode.ERROR,"文件上传失败");
    }