使用Spring Boot集成FastDFS的示例代码

使用Spring Boot集成FastDFS的示例代码

这篇文章我们介绍如何使用Spring hxgkJwSVgBoot将文件上传到分布式文件系统FastDFS中。

这个项目会在上一个项目的基础上进行构建。

1、pom包配置

我们使用Spring Boot最新版本1.5.9、jdk使用1.8、tomcat8.0。

org.csource

fastdfs-client-java

1.27-SNAPSHOT

加入了fastdfs-client-java包，用来调用FastDFS相关的API。

2、配置文件

resources目录下添加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

配置文件设置了连接的超时时间，编码格式以及tracker_server地址等信息

详细内容参考：fastdfs-client-java

3、封装FastDFS上传工具类

public class FastDFSFile {

private String name;

private byte[] content;

private String ext;

private String md5;

private String author;

//省略getter、setter

封装FastDFSClient类，包含常用的上传、下载、删除等方法。

首先在类加载的时候读取相应的配置信息，并进行初始化。

static {

try {

String filePath = new ClassPathResource("fdfs_client.conf").getFile().getAbsolutePath();;

ClientGlobal.init(filePath);

trackerClient = new TrackerClient();

trackerServer = trackerClient.getConnection();

hxgkJwSVg storahxgkJwSVggeServer = trackerClient.getStoreStorage(trackerServer);

} catch (Exception e) {

logger.error("FastDFS Client Init Fail!",e);

}

}

文件上传

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提供的客户端storageClient来进行文件上传，最后将上传结果返回。

根据groupName和文件名获取文件信息。

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;

}

下载文件

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;

}

删除文件

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时，直接调用FastDFSClient对应的方法即可。

4、编写上传控制类

从MultipartFile中读取文件信息，然后使用FastDFSClient将文件上传到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=multipartFilehttp://.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;

}

请求控制，调用上面方法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";

}

上传成功之后，将文件的路径展示到页面，效果图如下：

在浏览器中访问此Url，可以看到成功通过FastDFS展示：

这样使用Spring Boot 集成FastDFS的案例就完成了。

示例代码-github

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