Object Storage Service:List objects

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

public class Demo {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint of the China (Hangzhou) region is used. Specify your actual endpoint. 
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the name of the bucket. Example: examplebucket. 
        String bucketName = "examplebucket";
        // Specify the prefix in the names of the objects that you want to list. Example: exampledir/object. 
        String keyPrefix = "exampledir/object";

        // Create an OSSClient instance. 
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        try {
            // List objects. If you do not specify keyPrefix, all objects in the bucket are listed. If you specify keyPrefix, the objects whose names contain the specified prefix are listed. 
            ObjectListing objectListing = ossClient.listObjects(bucketName, keyPrefix);
            List<OSSObjectSummary> sums = objectListing.getObjectSummaries();
            for (OSSObjectSummary s : sums) {
                System.out.println("\t" + s.getKey());
            }
        } catch (OSSException oe) {
            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();
            }
        }
    }
}                  

<?php
if (is_file(__DIR__ . '/../autoload.php')) {
    require_once __DIR__ . '/../autoload.php';
}
if (is_file(__DIR__ . '/../vendor/autoload.php')) {
    require_once __DIR__ . '/../vendor/autoload.php';
}

use OSS\OssClient;
use OSS\Core\OssException;

// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
$accessKeyId = getenv("OSS_ACCESS_KEY_ID");
$accessKeySecret = getenv("OSS_ACCESS_KEY_SECRET");
// In this example, the endpoint of the China (Hangzhou) region is used. Specify your actual endpoint. 
$endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// Specify the name of the bucket. Example: examplebucket. 
$bucket= "examplebucket";

$ossClient = new OssClient($accessKeyId, $accessKeySecret, $endpoint, false);
// List objects. If you do not specify the prefix parameter, all objects in the root directory are listed. If you specify the prefix parameter, the objects whose names contain the specified prefix are listed. 
$prefix = 'dir/';
$options = array(
  'prefix' => $prefix,
);
try {
  $listObjectInfo = $ossClient->listObjects($bucket, $options);
} catch (OssException $e) {
  printf($e->getMessage() . "\n");
    return;
}
// Show the listed objects. 
$objectList = $listObjectInfo->getObjectList();
if (!empty($objectList)) {
    print("objectList:\n");
    foreach ($objectList as $objectInfo) {
        print($objectInfo->getKey() . "\n");
    }
}

const OSS = require('ali-oss');

const client = new OSS({
  // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to oss-cn-hangzhou. 
  region: 'yourregion',
  // Obtain access credentials from environment variables. Before you run the sample code, make sure that you have configured environment variables OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET. 
  accessKeyId: process.env.OSS_ACCESS_KEY_ID,
  accessKeySecret: process.env.OSS_ACCESS_KEY_SECRET,
  // Specify the name of the bucket. 
  bucket: 'yourbucketname'
});

async function list () {
    // By default, if no parameter is specified, up to 100 objects can be returned. 
    const result = await client.list();
    console.log(result);
}

list();

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
# Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
auth = oss2.ProviderAuth(EnvironmentVariableCredentialsProvider())
# Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
# Specify the name of the bucket. Example: examplebucket. 
bucket = oss2.Bucket(auth, 'https://oss-cn-hangzhou.aliyuncs.com', 'examplebucket')

# List all objects in the bucket. 
for obj in oss2.ObjectIteratorV2(bucket):
    print(obj.key)

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="https://gosspublic.alicdn.com/aliyun-oss-sdk-6.18.0.min.js"></script>
  </head>
  <body>
    <script>      
      const client = new OSS({
        // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to oss-cn-hangzhou. 
        region: "yourRegion",
        // Specify the temporary AccessKey pair obtained from STS. The AccessKey pair consists of an AccessKey ID and an AccessKey secret. 
        accessKeyId: 'yourAccessKeyId',
        accessKeySecret: 'yourAccessKeySecret',
        // Specify the security token that you obtained from STS. 
        stsToken: 'yourSecurityToken',
        // Specify the name of the bucket. Example: examplebucket. 
        bucket: "examplebucket",
      });

      async function list(dir) {
        try {
          // By default, up to 1,000 objects are listed. 
          let result = await client.list();
          console.log(result);

          // The list operation continues from the last object that was stopped in the previous list operation. 
          if (result.isTruncated) {
            let result = await client.list({ marker: result.nextMarker });
          }

          // List the objects whose names start with the prefix 'ex'. 
          result = await client.list({
            prefix: "ex",
          });
          console.log(result);

          // List all objects whose names start with the prefix 'ex' and are alphabetically after the 'example' object. 
          result = await client.list({
            prefix: "ex",
            marker: "example",
          });
          console.log(result);
        } catch (e) {
          console.log(e);
        }
      }

      list();
    </script>
  </body>
</html>
          

using Aliyun.OSS;
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
var endpoint = "yourEndpoint";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. Example: examplebucket. 
var bucketName = "examplebucket";
// Create an OSSClient instance. 
var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
try
{
    var listObjectsRequest = new ListObjectsRequest(bucketName);
    // List objects in the bucket by using simple list. By default, 100 objects are returned. 
    var result = client.ListObjects(listObjectsRequest);
    Console.WriteLine("List objects succeeded");
    foreach (var summary in result.ObjectSummaries)
    {
        Console.WriteLine("File name:{0}", summary.Key);
    }
}
catch (Exception ex)
{
    Console.WriteLine("List objects failed. {0}", ex.Message);
}

// Specify the name of the bucket. Example: examplebucket. 
ListObjectsRequest request = new ListObjectsRequest("examplebucket");
// Specify the maximum number of objects that you want to return. If you do not specify this parameter, the value of this parameter is 100. The maximum value of MaxKeys that you can specify is 1000. 
request.setMaxKeys(20);

oss.asyncListObjects(request, new OSSCompletedCallback<ListObjectsRequest, ListObjectsResult>() {
    @Override
    public void onSuccess(ListObjectsRequest request, ListObjectsResult result) {
        for (OSSObjectSummary objectSummary : result.getObjectSummaries()) {
            Log.i("ListObjects", objectSummary.getKey());
        }
    }

    @Override
    public void onFailure(ListObjectsRequest request, ClientException clientException, ServiceException serviceException) {
        // Handle request exceptions. 
        if (clientException != null) {
            // Handle client-side exceptions such as network errors. 
            clientException.printStackTrace();
        }
        if (serviceException != null) {
            // Handle server-side exceptions. 
            Log.e("ErrorCode", serviceException.getErrorCode());
            Log.e("RequestId", serviceException.getRequestId());
            Log.e("HostId", serviceException.getHostId());
            Log.e("RawMessage", serviceException.getRawMessage());
        }
    }
});

package main
import (
    "fmt"
    "os"
    "github.com/aliyun/aliyun-oss-go-sdk/oss"
)
func HandleError(err error) {
    fmt.Println("Error:", err)
    os.Exit(-1)
}
func main() {
    // Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
    provider, err := oss.NewEnvironmentVariableCredentialsProvider()
    if err != nil {
        fmt.Println("Error:", err)
        os.Exit(-1)
    }

    // Create an OSSClient instance. 
    // Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
    client, err := oss.New("yourEndpoint", "", "", oss.SetCredentialsProvider(&provider))
    if err != nil {
         HandleError(err)
    }
    // Specify the name of the bucket. 
    bucketName := "yourBucketName"
    bucket, err := client.Bucket(bucketName)
    if err != nil {
         HandleError(err)
    }
    continueToken := ""
    for {
         lsRes, err := bucket.ListObjectsV2(oss.ContinuationToken(continueToken))
         if err != nil {
             HandleError(err)
          }
          // Display the listed objects. By default, up to 100 objects are returned at a time. 
          for _, object := range lsRes.Objects {
              fmt.Println(object.Key, object.Type, object.Size, object.ETag, object.LastModified, object.StorageClass)
          }
          if lsRes.IsTruncated {
              continueToken = lsRes.NextContinuationToken
          } else {
              break
          }
      }
}

OSSGetBucketRequest * getBucket = [OSSGetBucketRequest new];
// Specify the name of the bucket. Example: examplebucket. 
getBucket.bucketName = @"examplebucket";
// Specify the maximum number of objects that you want to return. If you do not specify this parameter, the value of this parameter is 100. The maximum value of MaxKeys that you can specify is 1000. 
getBucket.maxKeys = 20;

OSSTask * getBucketTask = [client getBucket:getBucket];
[getBucketTask continueWithBlock:^id(OSSTask *task) {
    if (!task.error) {
        OSSGetBucketResult * result = task.result;
        NSLog(@"get bucket success!");
        for (NSDictionary * objectInfo in result.contents) {
            NSLog(@"list object: %@", objectInfo);
        }
    } else {
        NSLog(@"get bucket failed, error: %@", task.error);
    }
    return nil;
}];

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize information about the account that is used to access OSS. */
            
    /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";

    /* Initialize resources such as network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);

    /* List objects. */
    ListObjectsRequest request(BucketName);
    auto outcome = client.ListObjects(request);

    if (!outcome.isSuccess())  {    
        /* Handle exceptions. */
        std::cout << "ListObjects fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;  
    }
    else {
        for (const auto& object : outcome.result().ObjectSummarys()) {
            std::cout << "object"<<
            ",name:" << object.Key() <<
            ",size:" << object.Size() <<
            ",lastmodify time:" << object.LastModified() << std:: endl;
         }      
    }

    /* Release resources such as network resources. */
    ShutdownSdk();
    return 0;
}

#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
void init_options(oss_request_options_t *options)
{
    options->config = oss_config_create(options->pool);
    /* Use a char* string to initialize data of the aos_string_t type. */
    aos_str_set(&options->config->endpoint, endpoint);
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
    aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
    /* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
    options->config->is_cname = 0;
    /* Specify network parameters, such as the timeout period. */
    options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
    /* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
    if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
        exit(1);
    }
    /* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
    aos_pool_t *pool;
    /* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
    aos_pool_create(&pool, NULL);
    /* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
    oss_request_options_t *oss_client_options;
    /* Allocate the memory resources in the memory pool to the options. */
    oss_client_options = oss_request_options_create(pool);
    /* Initialize oss_client_options. */
    init_options(oss_client_options);
    /* Initialize the parameters. */
    aos_string_t bucket;
    aos_status_t *resp_status = NULL; 
    oss_list_object_params_t *params = NULL;
    oss_list_object_content_t *content = NULL;
    int size = 0;
    char *line = NULL;
    char *prefix = "";
    char *nextMarker = "";
    aos_str_set(&bucket, bucket_name);
    params = oss_create_list_object_params(pool);
    /* Set the max_ret parameter to specify the maximum number of objects to return. */
    /* By default, a maximum of 1,000 objects can be listed at a time. If the number of objects to list exceed 1,000, only the first 1,000 objects in alphabetical order are returned. In the returned results, the value of truncated is true, and the value of next_marker is returned as the start point for the next query. */
    params->max_ret = 100;
    aos_str_set(&params->prefix, prefix);
    aos_str_set(&params->marker, nextMarker);
    printf("Object\tSize\tLastModified\n");
    /* List all objects. */
    do {
        resp_status = oss_list_object(oss_client_options, &bucket, params, NULL);
        if (!aos_status_is_ok(resp_status))
        {
            printf("list object failed\n");
            break;
        }
        aos_list_for_each_entry(oss_list_object_content_t, content, &params->object_list, node) {
            ++size;
            line = apr_psprintf(pool, "%.*s\t%.*s\t%.*s\n", content->key.len, content->key.data, 
                content->size.len, content->size.data, 
                content->last_modified.len, content->last_modified.data);
            printf("%s", line);
        }
        nextMarker = apr_psprintf(pool, "%.*s", params->next_marker.len, params->next_marker.data);
        aos_str_set(&params->marker, nextMarker);
        aos_list_init(&params->object_list);
        aos_list_init(&params->common_prefix_list);
    } while (params->truncated == AOS_TRUE);
    printf("Total %d\n", size);
    /* Release the memory pool. This operation releases the memory resources allocated for the request. */
    aos_pool_destroy(pool);
    /* Release the allocated global resources. */
    aos_http_io_deinitialize();
    return 0;
}