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Java管理LiveChannel

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本文介绍Java SDK的LiveChannel常见操作,如创建LiveChannel、列举LiveChannel及删除LiveChannel等。

说明

本文示例由阿里云用户bin提供,仅供参考。

部分示例需要用到fastjson,请在使用前在pom文件下配置相关依赖,配置信息如下。

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>1.2.54</version>
</dependency>

创建LiveChannel

通过RTMP协议上传音视频数据前,必须先调用该接口创建一个LiveChannel。调用PutLiveChannel接口会返回RTMP推流地址,以及对应的播放地址。

说明

您可以使用返回的地址进行推流、播放,您还可以根据该LiveChannel的名称来发起相关的操作,如查询推流状态、查询推流记录、禁止推流等。

创建时如果已存在同名的LiveChannel,新创建的LiveChannel会覆盖之前的,且新建的LiveChannel设置和状态也会变成初始默认。

以下代码用于创建LiveChannel。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import java.util.List;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);


        try {
            CreateLiveChannelRequest request = new CreateLiveChannelRequest(bucketName,
                    liveChannelName, "desc", LiveChannelStatus.Enabled, new LiveChannelTarget());
            CreateLiveChannelResult result = ossClient.createLiveChannel(request);

            //获取推流地址。
            List<String> publishUrls = result.getPublishUrls();
            for (String item : publishUrls) {
                System.out.println(item);
            }

            //获取播放地址。
            List<String> playUrls = result.getPlayUrls();
            for (String item : playUrls) {
                System.out.println(item);
            }

        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

列举LiveChannel

以下代码用于列举指定的LiveChannel。

import com.alibaba.fastjson.JSON;
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);
        
        try {
            ListLiveChannelsRequest request = new ListLiveChannelsRequest(bucketName);
            LiveChannelListing liveChannelListing = ossClient.listLiveChannels(request);
            System.out.println(JSON.toJSONString(liveChannelListing));
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

删除LiveChannel

说明
  • 当有客户端正在向LiveChannel推流时,删除请求会失败。运行完毕未返回错误信息则代表删除成功。

  • DeleteLiveChannel接口只会删除LiveChannel本身,不会删除推流生成的文件。

以下代码用于删除指定的LiveChannel。

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            LiveChannelGenericRequest request = new LiveChannelGenericRequest(bucketName, liveChannelName);
            ossClient.deleteLiveChannel(request);
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

设置LiveChannel状态

以下代码用于设置LiveChannel状态,如果运行完毕为出现错误信息则表示设置成功。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            // 使用客户端设置状态,如需打开则配置为LiveChannelStatus.Enabled,如需关闭则配置为LiveChannelStatus.Disabled。
            ossClient.setLiveChannelStatus(bucketName, liveChannelName, LiveChannelStatus.Enabled);
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

获取LiveChannel鉴权地址

以下代码用于获取LiveChannel鉴权地址。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import java.util.List;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            CreateLiveChannelRequest request = new CreateLiveChannelRequest(bucketName,
                    liveChannelName, "desc", LiveChannelStatus.Enabled, new LiveChannelTarget());
            CreateLiveChannelResult result = ossClient.createLiveChannel(request);

            // 获取推流地址。
            List<String> publishUrls = result.getPublishUrls();
            for (String item : publishUrls) {
                // 获取不包含签名信息的推流地址。
                System.out.println(item);

                // 获取包含签名信息的推流地址。
                LiveChannelInfo liveChannelInfo = ossClient.getLiveChannelInfo(bucketName, liveChannelName);
                // expires表示过期时间,单位为Unix时间戳。本示例以设置过期时间为1小时为例。
                long expires = System.currentTimeMillis() / 1000 + 3600;
                // playlistName表示调用createLiveChannel接口时传入的具体名称。如果未传入该参数,则默认值为"playlist.m3u8"。您也可以通过调用getLiveChannelInfo接口获取该名称。
                String signRtmpUrl = ossClient.generateRtmpUri(bucketName, liveChannelName, liveChannelInfo.getTarget().getPlaylistName(), expires);
                System.out.println(signRtmpUrl);
            }

            // 获取播放地址。
            List<String> playUrls = result.getPlayUrls();
            for (String item : playUrls) {
                System.out.println(item);
            }
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

获取LiveChannel状态信息

以下代码用于获取指定LiveChannel的推流状态信息。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            LiveChannelStat liveChannelStat = ossClient.getLiveChannelStat(bucketName, liveChannelName);
            System.out.println(liveChannelStat.toString());
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

获取LiveChannel配置信息

以下代码用于获取指定LiveChannel的配置信息。

import com.alibaba.fastjson.JSON;
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.*;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            LiveChannelInfo liveChannelInfo = ossClient.getLiveChannelInfo(bucketName, liveChannelName);
            System.out.println(JSON.toJSONString(liveChannelInfo));
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

生成LiveChannel播放列表

PostVodPlaylist接口用于为指定的LiveChannel生成一个点播用的播放列表。OSS会查询指定时间范围内由该LiveChannel推流生成的ts文件,并将其拼装为一个m3u8播放列表。

以下代码用于生成LiveChannel播放列表。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";
        // 填写PlayList名称。
        String playListName = "yourPlayListName";


        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);
        // 查询的起止时间区间,间隔不能大于24小时。
        long startTime = getUnixTimestamp("2019-06-27 23:00:00");
        long endTIme = getUnixTimestamp("2019-06-28 22:00:00");
        try {
            ossClient.generateVodPlaylist(bucketName, liveChannelName, playListName, startTime, endTIme);
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }

    private static long getUnixTimestamp(String time) {
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date date = format.parse(time);
            return date.getTime() / 1000;
        } catch (ParseException e) {
            e.printStackTrace();
            return 0;
        }
    }
}

查看LiveChannel播放列表

以下代码用于查看指定LiveChannel推流生成的且满足指定时间段内的播放列表。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.OSSObject;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";


        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);
        long startTime = getUnixTimestamp("2019-06-27 23:00:00");
        long endTIme = getUnixTimestamp("2019-06-28 22:00:00");
        try {
            OSSObject ossObject = ossClient.getVodPlaylist(bucketName, liveChannelName, startTime, endTIme);
            System.out.println(ossObject.toString());
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }

    private static long getUnixTimestamp(String time) {
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date date = format.parse(time);
            return date.getTime() / 1000;
        } catch (ParseException e) {
            e.printStackTrace();
            return 0;
        }
    }
}

获取LiveChannel推流记录

GetLiveChannelHistory接口用于获取指定LiveChannel的推流记录。使用GetLiveChannelHistory接口最多会返回指定LiveChannel最近的10次推流记录。

以下代码用于获取LiveChannel推流记录。

import com.alibaba.fastjson.JSON;
import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.LiveRecord;
import java.util.List;
import com.aliyun.oss.common.auth.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前,请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写Bucket名称,例如examplebucket。
        String bucketName = "examplebucket";
        // 填写LiveChannel名称。
        String liveChannelName = "yourLiveChannelName";


        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            List<LiveRecord> list = ossClient.getLiveChannelHistory(bucketName, liveChannelName);
            System.out.println(JSON.toJSONString(list));
        } catch (OSSException oe) {
            oe.printStackTrace();
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}

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