Object Storage Service:How do I obtain the URL of a single object or the URLs of multiple objects?

import com.aliyun.oss.*;
import java.net.URL;
import java.util.Date;

public class Demo {
    public static void main(String[] args) throws Throwable {
        // In this example, the endpoint of the China (Hangzhou) region is used. Specify your actual endpoint. 
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Specify the temporary AccessKey pair obtained from STS. The AccessKey pair consists of an AccessKey ID and an AccessKey secret. 
        String accessKeyId = "yourAccessKeyId";
        String accessKeySecret = "yourAccessKeySecret";
        // Specify the security token obtained from STS. 
        String securityToken = "yourSecurityToken";
        // Specify the name of the bucket. Example: examplebucket. 
        String bucketName = "examplebucket";
        // Specify the full path of the object. Example: exampleobject.txt. Do not include the bucket name in the full path. 
        String objectName = "exampleobject.txt";

        // Use the temporary access credentials obtained from STS to create an OSSClient instance. 
        // Create an OSSClient instance. 
        OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret, securityToken);

        try {
            // Specify the validity period of the signed URL. Unit: milliseconds. 
            Date expiration = new Date(new Date().getTime() + 3600 * 1000);
            // Generate a signed URL that allows HTTP GET requests. Visitors can enter the URL in a browser to access specific OSS resources. 
            URL url = ossClient.generatePresignedUrl(bucketName, objectName, expiration);
            System.out.println(url);
        } 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;
use OSS\Http\RequestCore;
use OSS\Http\ResponseCore;

// Specify the temporary AccessKey pair obtained from STS. An AccessKey pair consists of an AccessKey ID and an AccessKey secret. 
$accessKeyId = "yourAccessKeyId";
$accessKeySecret = "yourAccessKeySecret";
// Specify the security token obtained from STS. 
$securityToken = "yourSecurityToken";
// 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. 
$endpoint = "yourEndpoint";
// Specify the name of the bucket. 
$bucket= "examplebucket";
// Specify the full path of the object. Do not include the bucket name in the full path. 
$object = "exampleobject.txt";
// Set the validity period of a signed URL to 3,600 seconds. 
$timeout = 3600;
// Generate a signed URL that is used to preview the object and use the custom domain name that is mapped to the bucket to access the object. 
$options= array(
    "response-content-disposition"=>"inline",);
// Generate a signed URL that is used to download the object. 
/*$options = array(
    "response-content-disposition"=>"attachment",
);*/
try {
    $ossClient = new OssClient($accessKeyId, $accessKeySecret, $endpoint, false, $securityToken);
    $signedUrl = $ossClient->signUrl($bucket, $object, $timeout,'GET',$options);

} catch (OssException $e) {
    printf(__FUNCTION__ . ": FAILED\n");
    printf($e->getMessage() . "\n");
    return;
}
print(__FUNCTION__ . ": signedUrl: " . $signedUrl . "\n");               

const { default: axios } = require("axios");
const fs = require("fs");

const client = new OSS({
  // Specify the region in which the bucket is located. For example, if your bucket is located in the China (Hangzhou) region, set the region to oss-cn-hangzhou. 
  region: 'yourRegion',
  // The AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using these credentials to perform operations in OSS is a high-risk operation. We recommend that you use a RAM user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console. 
  accessKeyId: 'yourAccessKeyId',
  accessKeySecret: 'yourAccessKeySecret',
  // Specify the name of the bucket. 
  bucket: 'examplebucket'
});
// Generate a signed URL for the object. 
const url = client.signatureUrl("examplefile.txt");

// Use the signed URL to download the object to your local computer and enter the full path of the object. 
const file = "D:\\localpath\\examplefile.txt";

axios({
  url,
  method: "GET",
})
  .then((r) => {
    fs.writeFile(file, r.data, (err) => {
      if (err) {
        console.log(err);
      }
    });
  })
  .catch((e) => console.log(e));

using Aliyun.OSS;
using Aliyun.OSS.Common;
// 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. 
var endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// The AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using these credentials to perform operations in OSS is a high-risk operation. We recommend that you use a RAM user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console. 
var accessKeyId = "yourAccessKeyId";
var accessKeySecret = "yourAccessKeySecret";
// Specify the name of the bucket. Example: examplebucket. 
var bucketName = "examplebucket";
// Specify the full path of the object. The full path cannot contain the bucket name. Example: exampledir/exampleobject.txt. 
var objectName = "exampledir/exampleobject.txt";
// Specify the full path of the local file to which you want to download the object. Example: D:\\localpath\\examplefile.txt. If the specified local file exists, the object to download replaces the file. If the specified local file does not exist, the downloaded file is saved in the path. 
var downloadFilename = "D:\\localpath\\examplefile.txt";
// Create an OSSClient instance. 
var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
try
{
    var metadata = client.GetObjectMetadata(bucketName, objectName);
    var etag = metadata.ETag;
    // Generate the signed URL. 
    var req = new GeneratePresignedUriRequest(bucketName, objectName, SignHttpMethod.Get)
      {
        // Specify the validity period of the signed URL. Default value: 3600. Unit: seconds. 
        Expiration = DateTime.Now.AddHours(1),
    };
    var uri = client.GeneratePresignedUri(req);
}
catch (OssException ex)
{
    Console.WriteLine("Failed with error code: {0}; Error info: {1}. \nRequestID:{2}\tHostID:{3}",
        ex.ErrorCode, ex.Message, ex.RequestId, ex.HostId);
}
catch (Exception ex)
{
    Console.WriteLine("Failed with error info: {0}", ex.Message);
}

package main

import (
    "fmt"
    "github.com/aliyun/aliyun-oss-go-sdk/oss"
    "os"
)

func HandleError(err error) {
    fmt.Println("Error:", err)
    os.Exit(-1)
}

func main() {
    // After you obtain the temporary access credentials from STS, you can use the security token and temporary AccessKey pair that are contained in the credentials to create an OSSClient instance. 
    client, err := oss.New("yourEndpoint", "yourAccessKeyId", "yourAccessKeySecret", oss.SecurityToken("yourSecurityToken"))
    if err != nil {
        HandleError(err)
    }

    // Specify the name of the bucket. Example: examplebucket. 
    bucketName := "examplebucket"
    // Specify the full path of the object. Example: exampledir/exampleobject.txt. The full path cannot contain the bucket name. 
    objectName := "exampledir/exampleobject.txt"
    // Download the object to the specified path on your local computer. If a file that has the same name already exists in the specified path, the downloaded object overwrites the file. Otherwise, the downloaded file is saved in the path. 
    bucket, err := client.Bucket(bucketName)
    if err != nil {
        HandleError(err)
    }

    // Generate a signed URL with a specified validity period for downloading the object. In this example, the validity period of the URL is 60 seconds. 
    signedURL, err := bucket.SignURL(objectName, oss.HTTPGet, 60)
    if err != nil {
        HandleError(err)
    }
    fmt.Printf("Sign Url:%s\n", signedURL)
}

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

int main(void)
{
    /* Initialize the information about the account that is used to access OSS. */
    /* The AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using these credentials to perform operations in OSS is a high-risk operation. We recommend that you use a RAM user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console. */
    std::string AccessKeyId = "yourAccessKeyId";
    std::string AccessKeySecret = "yourAccessKeySecret";
    /* 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 = "yourEndpoint";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the full path of the object. The full path of the object cannot contain the bucket name. Example: exampledir/exampleobject.txt. */ 
    std::string GetobjectUrlName = "exampledir/exampleobject.txt";

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

    ClientConfiguration conf;
    OssClient client(Endpoint, AccessKeyId, AccessKeySecret, conf);

    /* Set the validity period of the signed URL. */
    std::time_t t = std::time(nullptr) + 1200;
    /* Generate the signed URL. */
    auto genOutcome = client.GeneratePresignedUrl(BucketName, GetobjectUrlName, t, Http::Get);
    if (genOutcome.isSuccess()) {
        std::cout << "GeneratePresignedUrl success, Gen url:" << genOutcome.result().c_str() << std::endl;
    }
    else {
        /* Handle exceptions. */
        std::cout << "GeneratePresignedUrl fail" <<
        ",code:" << genOutcome.error().Code() <<
        ",message:" << genOutcome.error().Message() <<
        ",requestId:" << genOutcome.error().RequestId() << std::endl;
        return -1;
    }

    /* 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";
/* The AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using these credentials to perform operations in OSS is a high-risk operation. We recommend that you use a RAM user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console. */
const char *access_key_id = "yourAccessKeyId";
const char *access_key_secret = "yourAccessKeySecret";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the full path of the object. The full path of the object cannot contain the bucket name. Example: exampledir/exampleobject.txt. */
const char *object_name = "exampledir/exampleobject.txt";
/* Specify the full path of the local file. */
const char *local_filename = "yourLocalFilename";
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);
    aos_str_set(&options->config->access_key_id, access_key_id);
    aos_str_set(&options->config->access_key_secret, access_key_secret);
    /* Specify whether to use CNAME to access OSS. The value of 0 indicates that CNAME is not used. */
    options->config->is_cname = 0;
    /* Configure 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 that is 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_string_t object;
    aos_string_t file;
    aos_table_t *headers = NULL;
    aos_table_t *params = NULL;
    aos_table_t *resp_headers = NULL; 
    aos_status_t *resp_status = NULL; 
    aos_http_request_t *req;
    apr_time_t now;
    char *url_str;
    aos_string_t url;
    int64_t expire_time; 
    int one_hour = 3600;
    aos_str_set(&bucket, bucket_name);
    aos_str_set(&object, object_name);
    aos_str_set(&file, local_filename);
    expire_time = now / 1000000 + one_hour;
    headers = aos_table_make(pool, 0);
    params = aos_table_make(pool, 0);
    req = aos_http_request_create(pool);
    req->method = HTTP_GET;
    now = apr_time_now(); /* Unit: microseconds */
    expire_time = now / 1000000 + one_hour;
    /* Generate a signed URL. */
    url_str = oss_gen_signed_url(oss_client_options, &bucket, &object, expire_time, req);
    aos_str_set(&url, url_str);    
    /* Release the memory pool. This operation releases memory resources that are allocated for the request. */
    aos_pool_destroy(pool);
    /* Release the allocated global resources. */
    aos_http_io_deinitialize();
    return 0;
}