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关于FastDFS蛋疼的集群和负载均衡(十)之编写FastDFSUtil

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Java Linux

diary_report.jpg

Interesting things

因为元旦，公司放3天假。但是这3天里面也不敢松懈，继续撸FastDFS了。

What did you do today

  • 我们查看fastdfs-client-java的源码，根据自己的需求封装FastDFSUtil，核心方法为upload()、download()、delete()、getFileInfo()、getFileMetaData()。代码没什么好说的，用到的设计模式是单例模式，是用静态内部类实现的单例。

    public class FastDFSUtil {

private static String classPath = FastDFSUtil.class.getProtectionDomain().getCodeSource().getLocation().getPath();

private static String FASTDFS_CLIENT_CONF = classPath + "fdfs_client.conf";

private static TrackerClient trackerClient = null;

private static TrackerServer trackerServer = null;

private static StorageClient storageClient = null;

private static StorageServer storageServer = null;

private FastDFSUtil () {
    FastDFSUtil.init();
}

private static void init() {
    try {
        ClientGlobal.init(FASTDFS_CLIENT_CONF);
        trackerClient = new TrackerClient();
        trackerServer = trackerClient.getConnection();
        storageServer = trackerClient.getStoreStorage(trackerServer);
        storageClient = new StorageClient(trackerServer, storageServer);

    } catch (Exception e) {
        throw new RuntimeException("init exception");
    }
}

public static FastDFSUtil getInstance() {
    return FastDFSUtilHolder.INSTANCE;
}

private static class FastDFSUtilHolder {
    private static final FastDFSUtil INSTANCE = new FastDFSUtil();
}

public static String upload(String maydayImg, String fileExtName, NameValuePair[] metaDataList) {
    try {
        String fileIds[] = storageClient.upload_file(maydayImg, fileExtName, metaDataList);

        System.out.println(fileIds.length);
        System.out.println("group:" + fileIds[0]);
        System.out.println("path:" + fileIds[1]);

        return fileIds[0] + fileIds[1];
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException("upload exception");
    }
}

public static void download(String group, String file, String storePath) {
    try {
        byte[] data = storageClient.download_file(group, file);
        IOUtils.write(data, new FileOutputStream(new File(storePath
                + "/" + file.substring(file.lastIndexOf("/") + 1))));
        System.out.println("download success");
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException("download exception");
    }
}

public static FileInfo getFileInfo(String group, String file) {
    try {
        FileInfo fileInfo = storageClient.get_file_info(group, file);
        System.out.println("source ip=" + fileInfo.getSourceIpAddr());
        System.out.println("file sizes=" + fileInfo.getFileSize());
        System.out.println("timestamp=" + fileInfo.getCreateTimestamp());
        System.out.println("crc32=" + fileInfo.getCrc32());

        return fileInfo;
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException("gets file info exception");
    }
}

public static NameValuePair[] getFileMataData(String group, String file) {
    try {
        NameValuePair[] metas = storageClient.get_metadata(group, file);
        return metas;
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException("gets file metadata exception");
    }
}

public static void delete(String group, String file) {
    try {
        storageClient.delete_file(group, file);
        System.out.println("detele file success");
    } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException("deletes file exception");
    }
}
}

  • 整个项目结构是这样子的。
    image.png

  • resources目录下，还需要添加fdfs_client.conf。具体如下: 
    
connect_timeout = 2
network_timeout = 30
charset = UTF-8
http.tracker_http_port = 8000
http.anti_steal_token = no
http.secret_key = FastDFS1234567890

tracker_server = 192.168.12.11:22122
tracker_server = 192.168.12.22:22122


* 测试upload()方法，我们上传resources/upload/目录下的mayday_life.png。
public static String BASE_UPLOAD_PATH = TestFastDFS.class.getProtectionDomain().getCodeSource()
        .getLocation().getPath();

public static String MAYDAY_IMG = BASE_UPLOAD_PATH + "upload/mayday_life.jpg";

    NameValuePair[] metaDataList = new NameValuePair[] {
            new NameValuePair("bound_name", "mayday"),
            new NameValuePair("masterpiece", "juejiang")
    };

    //tests upload mayday_life.jpg
    FastDFSUtil.getInstance().upload(MAYDAY_IMG, "jpg", metaDataList);
* 上传成功！我们可以去访问http://192.168.12.111/fastdfs/group1/M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg
![image.png](http://upload-images.jianshu.io/upload_images/4636177-6a5d45a6bc7534bb.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![image.png](http://upload-images.jianshu.io/upload_images/4636177-87c9f39aebacbe0a.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 测试download()方法
    public static String BASE_DOWNLOAD_PATH =
        "D:/myeclipse_workspace/fastdfs_demo/src/main/resources/download";

    //download group1/M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg
    FastDFSUtil.getInstance().download("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg"
            , BASE_DOWNLOAD_PATH);

* 下载成功！我们可以看到download文件夹下多了wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg。
![image.png](http://upload-images.jianshu.io/upload_images/4636177-9ffa0afc8ac0cc9a.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

![image.png](http://upload-images.jianshu.io/upload_images/4636177-0d53c5d27105610c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 测试getFileInfo()方法
    //gets "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg" file info
    FastDFSUtil.getInstance().getFileInfo("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg");

* 获取文件信息成功！
![image.png](http://upload-images.jianshu.io/upload_images/4636177-81c16a6023bff133.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 测试getFileMetaData()方法
    //gets "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg" file metadata
    NameValuePair[] metaLists = FastDFSUtil.getInstance().getFileMataData("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg");

    for (NameValuePair nvp : metaDataList) {
        System.out.println(nvp.getName() + ":" + nvp.getValue());
    }
* 获取文件元信息成功！
![image.png](http://upload-images.jianshu.io/upload_images/4636177-d9d98112a917710b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 测试detele()方法
    //detele "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg" file
    FastDFSUtil.getInstance().delete("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg");
![image.png](http://upload-images.jianshu.io/upload_images/4636177-b7f52a33a23fb228.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 删除成功！我们进入192.168.12.33和192.168.12.44的cd /fastdfs/storage/data/M00/00/00/目录下面已经找不到wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg了。
![image.png](http://upload-images.jianshu.io/upload_images/4636177-9dd29e85c016cf0e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![image.png](http://upload-images.jianshu.io/upload_images/4636177-1261167ca5dffc27.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

* 最后附上完整测试用例。

public class TestFastDFS {

public static String BASE_UPLOAD_PATH = TestFastDFS.class.getProtectionDomain().getCodeSource()
        .getLocation().getPath();

public static String MAYDAY_IMG = BASE_UPLOAD_PATH + "upload/mayday_life.jpg";

public static String BASE_DOWNLOAD_PATH =
        "D:/myeclipse_workspace/fastdfs_demo/src/main/resources/download";

public static void main(String[] args) {
    NameValuePair[] metaDataList = new NameValuePair[] {
            new NameValuePair("bound_name", "mayday"),
            new NameValuePair("masterpiece", "juejiang")
    };

    //tests upload mayday_life.jpg
    //FastDFSUtil.getInstance().upload(MAYDAY_IMG, "jpg", metaDataList);

    //upload success
    //group:group1
    //path:M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg

    //download group1/M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg
    //FastDFSUtil.getInstance().download("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg"
            //, BASE_DOWNLOAD_PATH);

    //gets "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg" file info
    //FastDFSUtil.getInstance().getFileInfo("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg");

    //gets "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg" file metadata
    //NameValuePair[] metaLists = FastDFSUtil.getInstance().getFileMataData("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg");

    //for (NameValuePair nvp : metaDataList) {
        //System.out.println(nvp.getName() + ":" + nvp.getValue());
    //}

    //detele "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg" file
    FastDFSUtil.getInstance().delete("group1", "M00/00/00/wKgMLFpHPe-AOvAYAAd8hCbLY3Y881.jpg");

}

}


***
###Summary
> 写完了，就要陪女朋友吃螺蛳粉，逛万达广场，看电影咯。
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发表于 2018.01.12 15:59， 共 2591 人浏览

本文原创发布于慕课网 ，转载请注明出处，谢谢合作

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