OBS JAVA SDK 实践4：统计指定目录下的文件和子目录大小

1      背景介绍 & 效果展示

可以通过JAVA SDK统计指定目录下的文件和子目录大小，效果如下。

图1 指定目录share/下的所有文件

图2 统计指定目录下的文件和子目录大小

2      java代码参考

前提：

需要先下载OBS最新的JAVA SDK，参考官网链接：https://developer.huaweicloud.com/sdk?OBS，并在自己的项目中导入SDK中的JAR包。

       public static void main(String[] args) throws IOException {

                   String endPoint = "https://your-endpoint";

                   String ak = "*** Provide your Access Key ***";

                   String sk = "*** Provide your Secret Key ***";

                   // 创建ObsClient实例

                   ObsClient obsClient = new ObsClient(ak, sk, endPoint);

                   String bucketName = "chongchongtest";

                   ListObjectsRequest request = new ListObjectsRequest(bucketName);

                   // 统计文件夹对象名"share/"下面的子目录和文件的大小

                   request.setPrefix("share/");

                   request.setDelimiter("/");

                   ObjectListing result;

                   // 统计文件夹下对象的大小

                   System.out.println("Objects:");

                   do{

                       result = obsClient.listObjects(request);

                       for (ObsObject obsObject : result.getObjects())

                       {

                             double objectSize = obsObject.getMetadata().getContentLength() / 1024.0;

                           System.out.println("\t" + obsObject.getObjectKey() + ": " + String.format("%.2f", objectSize) + "KB");

                       }

                       System.out.println("------------------------------");

                       request.setMarker(result.getNextMarker());

                   }while(result.isTruncated());

                   // 统计子目录的大小

                   System.out.println("\nFolder:");

                   do{

                       result = obsClient.listObjects(request);

                       for (String commonPrefix : result.getCommonPrefixes())

                       {

                           double objectSize = countFolerLength(obsClient, bucketName, commonPrefix);

                           System.out.println("\t" + commonPrefix + ": " + String.format("%.2f", objectSize) + "KB");

                       }

                       System.out.println("------------------------------");

                       request.setMarker(result.getNextMarker());

                   }while(result.isTruncated());

          }

          //统计每个子目录的大小

          private static double countFolerLength(ObsClient obsClient, String bucketName, String folder) {

                   double size = 0L;

                   ListObjectsRequest request = new ListObjectsRequest(bucketName);

                   request.setPrefix(folder);

                   ObjectListing result;

                   do{

                       result = obsClient.listObjects(request);

                       for (ObsObject obsObject : result.getObjects())

                       {

                           size += obsObject.getMetadata().getContentLength() / 1024.0;

                       }

                       request.setMarker(result.getNextMarker());

                   }while(result.isTruncated());

                   return size;

          }                   

3      附录链接

OBS JAVA SDK 列举对象其它使用方法，官网参考链接：https://support.huaweicloud.com/sdk-java-devg-obs/zh-cn_topic_0142815500.html