Day14_05_FastDFS教程之Springboot实现

Springboot中利用FASTDFS实现图片上传

 

一. 解决fastdfs-client-java-1.27-SNAPSHOT依赖包不存在的问题

因为fastdfs-client-java-1.27-SNAPSHOT.jar这个依赖包在maven中央仓库是没有的，需要自己编译源码成jar本地安装到maven 的本地仓库,安装完以后就能正常引用了(注意:本地必须安装了Maven,并配置好Maven环境变量).

    org.csource
    fastdfs-client-java
    1.27-SNAPSHOT

1. 下载fastdfs-client-java开发工具包

https://github.com/happyfish100/fastdfs-client-java



2. 需要把fastdfs-client-java开发工具包打包到本地的Maven仓库 2.1 解压fastdfs-client-java-master 2.2 进入fastdfs-client-java目录,在此处打开命令窗口 cmd



2.3 输入 mvn clean install



3. 构建一会,如出现以下提示,则成功把fastdfs-client-java打包到本地的Maven仓库.



至此,更新项目Maven,pom.xml文件就不会出现找不到fastdfs-client-java依赖了(成功导入fastdfs-client-java依赖).



二. 代码实现 1. pom包配置

    org.csource
    fastdfs-client-java
    1.27-SNAPSHOT

添加fastdfs-client-java依赖包,用来调用 FastDFS 的相关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.

3. 封装 FastDFS 上传工具类 3.1 封装FastDFSFile,文件基础信息包括文件名、内容、文件类型、作者等.

public class FastDFSFile {
    private String name;
    private byte[] content;
    private String ext;
    private String md5;
    private String author;
    //省略getter、setter
}

3.2 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();
        storageServer = trackerClient.getStoreStorage(trackerServer);
    } catch (Exception e) {
        logger.error("FastDFS Client Init Fail!",e);
    }
}

文件上传代码

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的代码

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;
}

下载文件代码

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;
}

删除文件代码

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=multipartFile.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.