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

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<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）

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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：

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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：

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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：

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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：

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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：

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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();

}

}