FastDFS实现文件上传下载实战

正好，淘淘商城讲这一块的时候，我又想起来当时老徐让我写过一个关于实现FastDFS实现文件上传下载的使用文档，当时结合我们的ITOO的视频系统和毕业论文系统，整理了一下，有根据网上查到的知识，总结了一点东西，下面分享一下

一、FastDFS简介：

        参见博客：http://blog.csdn.NET/liweizhong193516/article/details/53234486

二、FastDFS使用流程介绍：        

       我们在itoo的dobbu+zk框架中使用fastdfs+nginx+MySQL实现上传附件的功能，主要原理就是将附件上传到fastdfs得到一个文件的链接路径url，我们获取到这个url将他以字符串形式保存到我们的mysql中，下载的时候获取到这个url直接打开或者下载附件。（url内容参见博客：http://blog.csdn.Net/liweizhong193516/article/details/52556526）

               

               

        默认的，我们就知道fastdfs后面还有一个nginx服务器，当我们进行存储文件的时候，我们要通过fastdfs给我们生成一个保存地址，也就是grounpID 和保存地址，然后将文件已key-value方式存进nginx服务器中；当我们进行读取文件的时候，我们要通过获取mysql里面的相应文件的存储地址去nginx服务器中通过key，去取出我们的文件进行展示。（所以下载图，有点问题，在这里解释一下）

三、实现流程：

1、配置依赖：因为我们使用的maven来管理工程，所以，我们需要去陪pom文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.leech</groupId>
    <artifactId>fastdfs-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>fastdfs-demo</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.csource</groupId>
            <artifactId>fastdfs-client-java</artifactId>
            <version>1.25</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
            </dependency>
        </dependencies>
    </project>

当然，更多时候我们利用maven的继承特性，直接配置在父工程中，然后继承下来就o了。

2、新建fdfs_client.conf文件，在我们的itoo中，我们建立在（src/main/resources底下）

connect_timeout = 2
network_timeout = 30
charset = UTF-8
http.tracker_http_port = 80
#没什么用
http.anti_steal_token = no
http.secret_key = FastDFS1234567890
tracker_server = 192.168.17.112:22122
#tracker_server = 192.168.0.119:22122

3、实现文件上传：

      public void save(HttpServletRequest request,HttpServletResponse response){
    String videoName=request.getParameter("videoName");
    String videoType=request.getParameter("videoType");
    String videoDesc=request.getParameter("videoDesc");
    String videoPath=request.getParameter("videoPath");
    String picturePath=request.getParameter("picturePath");

    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date uploadTime=null;
    try {
        uploadTime = formatter.parse(formatter.format(new Date()));
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    JacksonJsonUntil jackJsonUtil =new JacksonJsonUntil ();

    String dataBaseName = "itoo_video";

    Video video=new Video();
    video.setUserName("why");
    video.setUserID("why");
    video.setVideoName(videoName);
    video.setVideoPath(videoPath);
    video.setVideoType(videoType);
    video.setVideoDesc(videoDesc);
    video.setDataBaseName(dataBaseName);
    video.setPicturePath(picturePath);
    video.setUploadTime(uploadTime);

    uploadFileService.save(video);

       jackJsonUtil.beanToJson(response,video);

}

/*
 * 上传文件
 */
@RequestMapping(value={"/upload"})
@ResponseBody
public void upload( MultipartFile file, HttpServletRequest request,HttpServletResponse response){

    String ext_Name = file.getOriginalFilename().split("\.")[1];
    String videoName=file.getOriginalFilename().split("\.")[0];

       byte[] bytes = null;
    try {
        bytes = file.getBytes();
    } catch (IOException e) {
        e.printStackTrace();
    }
    String videoPath=uploadFile(bytes,ext_Name);

    JacksonJsonUntil jackJsonUtil =new JacksonJsonUntil ();

    Video video=new Video();
    video.setVideoPath(videoPath);
    video.setVideoName(videoName);

    jackJsonUtil.beanToJson(response,video);
}

public String uploadFile(byte[] byteFile, String ext_file) {
    // 拼接服务区的文件路径
    StringBuffer sbPath = new StringBuffer();
    sbPath.append("http://192.168.22.252");
    try {
        // 初始化文件资源
        ClientGlobal
                .init("C:\Users\alsr\Desktop\ITOO-5.0\itoo-video-Test\dmsd-itoo-video-parent\dmsd-itoo-video-web\src\main\resources\fdfs_client.conf");

        // 链接FastDFS服务器，创建tracker和Stroage
        TrackerClient trackerClient = new TrackerClient();
        TrackerServer trackerServer = trackerClient.getConnection();
        StorageServer storageServer = null;
        StorageClient storageClient = new StorageClient(trackerServer,
                storageServer);
        //利用字节流上传文件
        String[] strings = storageClient.upload_file(byteFile, ext_file, null);

        for (String string : strings) {
            sbPath.append("/" + string);
            System.out.println(string);
        }
        // 全路径
        System.out.println(sbPath);
    } catch (IOException | MyException e) {
        e.printStackTrace();
    }
    return sbPath.toString();
}

       只要我们能正常接收到一个json类型的字符串（url地址），就证明我们已经上传成功了，如果不信，可以直接用浏览器去验证一下，看看能不能得到文件展示。

4、FastDFS实现文件下载：

public void testDownload() {
        try {
            ClientGlobal.init(conf_filename);
            TrackerClient tracker = new TrackerClient();
            TrackerServer trackerServer = tracker.getConnection();
            StorageServer storageServer = null;
            StorageClient storageClient = new StorageClient(trackerServer, storageServer);
            byte[] b = storageClient.download_file("group1", "M00/00/00/wKgRcFV_08OAK_KCAAAA5fm_sy874.conf");
            System.out.println(b);
            IOUtils.write(b, new FileOutputStream("D:/"+UUID.randomUUID().toString()+".conf"));
            }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

5、FastDFS获取将上传文件信息：

public void testGetFileInfo(){
        try {
            ClientGlobal.init(conf_filename);
            TrackerClient tracker = new TrackerClient();
            TrackerServer trackerServer = tracker.getConnection();
            StorageServer storageServer = null;
            StorageClient storageClient = new StorageClient(trackerServer, storageServer);
            FileInfo fi = storageClient.get_file_info("group1", "M00/00/00/wKgRcFV_08OAK_KCAAAA5fm_sy874.conf");
            System.out.println(fi.getSourceIpAddr());             System.out.println(fi.getFileSize());
            System.out.println(fi.getCreateTimestamp());             System.out.println(fi.getCrc32());
            }
        catch (Exception e) {
            e.printStackTrace();
            }
        }

6、FastDFS获取文件名称：

public void testGetFileMate(){
        try {
            ClientGlobal.init(conf_filename);
            TrackerClient tracker = new TrackerClient();
            TrackerServer trackerServer = tracker.getConnection();
            StorageServer storageServer = null;
            StorageClient storageClient = new StorageClient(trackerServer,
            storageServer);
            NameValuePair nvps [] = storageClient.get_metadata("group1", "M00/00/00/wKgRcFV_08OAK_KCAAAA5fm_sy874.conf");
            for(NameValuePair nvp : nvps){
                System.out.println(nvp.getName() + ":" + nvp.getValue());
                }
            }
        catch (Exception e) {
            e.printStackTrace();
            }
    }

7、FastDFS实现删除文件：

          public void testDelete(){
try {
    ClientGlobal.init(conf_filename);
    TrackerClient tracker = new TrackerClient();
    TrackerServer trackerServer = tracker.getConnection();
    StorageServer storageServer = null;
    StorageClient storageClient = new StorageClient(trackerServer,storageServer);
    int i = storageClient.delete_file("group1", "M00/00/00/wKgRcFV_08OAK_KCAAAA5fm_sy874.conf");
    System.out.println( i==0 ? "删除成功" : "删除失败:"+i);
    }
catch (Exception e) {
    e.printStackTrace();
    }
          }