使用 Amazon S3 的代码示例 AWS SDKs

以下代码示例向您展示了如何使用带有 AWS 软件开发套件 (SDK) 的 Amazon 简单存储服务。

基础知识是向您展示如何在服务中执行基本操作的代码示例。

操作是大型程序的代码摘录，必须在上下文中运行。您可以通过操作了解如何调用单个服务函数，还可以通过函数相关场景的上下文查看操作。

场景是向您展示如何通过在一个服务中调用多个函数或与其他 AWS 服务服务结合来完成特定任务的代码示例。

更多资源

• Amazon S3 用户指南 — 有关 Amazon S3 的更多信息。

• Amazon S3 API 参考 — 有关所有可用的 Amazon S3 操作的详细信息。

• AWS 开发者中心 — 您可以按类别或全文搜索筛选的代码示例。

• AWS SDK 示例 — 包含首选语言完整代码的 GitHub 存储库。包括有关设置和运行代码的说明。

开始使用

Hello Amazon S3

以下代码示例演示了如何开始使用 Amazon S3。

C++

SDK for C++

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

CMakeLists.txt CMake 文件的代码。

# Set the minimum required version of CMake for this project.
cmake_minimum_required(VERSION 3.13)

# Set the AWS service components used by this project.
set(SERVICE_COMPONENTS s3)

# Set this project's name.
project("hello_s3")

# Set the C++ standard to use to build this target.
# At least C++ 11 is required for the AWS SDK for C++.
set(CMAKE_CXX_STANDARD 11)

# Use the MSVC variable to determine if this is a Windows build.
set(WINDOWS_BUILD ${MSVC})

if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK.
    string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all")
    list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH})
endif ()

# Find the AWS SDK for C++ package.
find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS})

if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS)
    # Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging.

    # set(BIN_SUB_DIR "/Debug") # if you are building from the command line you may need to uncomment this
    # and set the proper subdirectory to the executables' location.

    AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR})
endif ()

add_executable(${PROJECT_NAME}
        hello_s3.cpp)

target_link_libraries(${PROJECT_NAME}
        ${AWSSDK_LINK_LIBRARIES})

hello_s3.cpp 源文件的代码。

#include <aws/core/Aws.h>
#include <aws/s3/S3Client.h>
#include <iostream>
#include <aws/core/auth/AWSCredentialsProviderChain.h>
using namespace Aws;
using namespace Aws::Auth;

/*
 *  A "Hello S3" starter application which initializes an Amazon Simple Storage Service (Amazon S3) client
 *  and lists the Amazon S3 buckets in the selected region.
 *
 *  main function
 *
 *  Usage: 'hello_s3'
 *
 */

int main(int argc, char **argv) {
    Aws::SDKOptions options;
    // Optionally change the log level for debugging.
//   options.loggingOptions.logLevel = Utils::Logging::LogLevel::Debug;
    Aws::InitAPI(options); // Should only be called once.
    int result = 0;
    {
        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";
               
        // You don't normally have to test that you are authenticated. But the S3 service permits anonymous requests, thus the s3Client will return "success" and 0 buckets even if you are unauthenticated, which can be confusing to a new user. 
        auto provider = Aws::MakeShared<DefaultAWSCredentialsProviderChain>("alloc-tag");
        auto creds = provider->GetAWSCredentials();
        if (creds.IsEmpty()) {
            std::cerr << "Failed authentication" << std::endl;
        }

        Aws::S3::S3Client s3Client(clientConfig);
        auto outcome = s3Client.ListBuckets();

        if (!outcome.IsSuccess()) {
            std::cerr << "Failed with error: " << outcome.GetError() << std::endl;
            result = 1;
        } else {
            std::cout << "Found " << outcome.GetResult().GetBuckets().size()
                      << " buckets\n";
            for (auto &bucket: outcome.GetResult().GetBuckets()) {
                std::cout << bucket.GetName() << std::endl;
            }
        }
    }

    Aws::ShutdownAPI(options); // Should only be called once.
    return result;
}

• 有关 API 的详细信息，请参阅 AWS SDK for C++ API 参考ListBuckets中的。

Go

适用于 Go V2 的 SDK

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

package main

import (
	"context"
	"errors"
	"fmt"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/aws/smithy-go"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Storage Service
// (Amazon S3) client and list up to 10 buckets in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	s3Client := s3.NewFromConfig(sdkConfig)
	count := 10
	fmt.Printf("Let's list up to %v buckets for your account.\n", count)
	result, err := s3Client.ListBuckets(ctx, &s3.ListBucketsInput{})
	if err != nil {
		var ae smithy.APIError
		if errors.As(err, &ae) && ae.ErrorCode() == "AccessDenied" {
			fmt.Println("You don't have permission to list buckets for this account.")
		} else {
			fmt.Printf("Couldn't list buckets for your account. Here's why: %v\n", err)
		}
		return
	}
	if len(result.Buckets) == 0 {
		fmt.Println("You don't have any buckets!")
	} else {
		if count > len(result.Buckets) {
			count = len(result.Buckets)
		}
		for _, bucket := range result.Buckets[:count] {
			fmt.Printf("\t%v\n", *bucket.Name)
		}
	}
}

• 有关 API 的详细信息，请参阅 适用于 Go 的 AWS SDK API 参考ListBuckets中的。

Java

适用于 Java 的 SDK 2.x

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.Bucket;
import software.amazon.awssdk.services.s3.model.ListBucketsResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;
import java.util.List;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 * <p>
 * For more information, see the following documentation topic:
 * <p>
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class HelloS3 {
    public static void main(String[] args) {
        Region region = Region.US_EAST_1;
        S3Client s3 = S3Client.builder()
            .region(region)
            .build();

        listBuckets(s3);
    }

    /**
     * Lists all the S3 buckets associated with the provided AWS S3 client.
     *
     * @param s3 the S3Client instance used to interact with the AWS S3 service
     */
    public static void listBuckets(S3Client s3) {
        try {
            ListBucketsResponse response = s3.listBuckets();
            List<Bucket> bucketList = response.buckets();
            bucketList.forEach(bucket -> {
                System.out.println("Bucket Name: " + bucket.name());
            });

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
}

• 有关 API 的详细信息，请参阅 AWS SDK for Java 2.x API 参考ListBuckets中的。

JavaScript

适用于 JavaScript (v3) 的软件开发工具包

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

import {
  paginateListBuckets,
  S3Client,
  S3ServiceException,
} from "@aws-sdk/client-s3";

/**
 * List the S3 buckets in your configured AWS account.
 */
export const helloS3 = async () => {
  // When no region or credentials are provided, the SDK will use the
  // region and credentials from the local AWS config.
  const client = new S3Client({});

  try {
    /**
     * @type { import("@aws-sdk/client-s3").Bucket[] }
     */
    const buckets = [];

    for await (const page of paginateListBuckets({ client }, {})) {
      buckets.push(...page.Buckets);
    }
    console.log("Buckets: ");
    console.log(buckets.map((bucket) => bucket.Name).join("\n"));
    return buckets;
  } catch (caught) {
    // ListBuckets does not throw any modeled errors. Any error caught
    // here will be something generic like `AccessDenied`.
    if (caught instanceof S3ServiceException) {
      console.error(`${caught.name}: ${caught.message}`);
    } else {
      // Something besides S3 failed.
      throw caught;
    }
  }
};

• 有关 API 的详细信息，请参阅 AWS SDK for JavaScript API 参考ListBuckets中的。

PHP

适用于 PHP 的 SDK

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

use Aws\S3\S3Client;

$client = new S3Client(['region' => 'us-west-2']);
$results = $client->listBuckets();
var_dump($results);

• 有关 API 的详细信息，请参阅 AWS SDK for PHP API 参考ListBuckets中的。

Python

适用于 Python 的 SDK（Boto3）

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

import boto3


def hello_s3():
    """
    Use the AWS SDK for Python (Boto3) to create an Amazon Simple Storage Service
    (Amazon S3) client and list the buckets in your account.
    This example uses the default settings specified in your shared credentials
    and config files.
    """

    # Create an S3 client.
    s3_client = boto3.client("s3")

    print("Hello, Amazon S3! Let's list your buckets:")

    # Create a paginator for the list_buckets operation.
    paginator = s3_client.get_paginator("list_buckets")

    # Use the paginator to get a list of all buckets.
    response_iterator = paginator.paginate(
        PaginationConfig={
            "PageSize": 50,  # Adjust PageSize as needed.
            "StartingToken": None,
        }
    )

    # Iterate through the pages of the response.
    buckets_found = False
    for page in response_iterator:
        if "Buckets" in page and page["Buckets"]:
            buckets_found = True
            for bucket in page["Buckets"]:
                print(f"\t{bucket['Name']}")

    if not buckets_found:
        print("No buckets found!")


if __name__ == "__main__":
    hello_s3()

• 有关 API 的详细信息，请参阅适用ListBuckets于 Python 的AWS SDK (Boto3) API 参考。

Ruby

适用于 Ruby 的 SDK

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

# frozen_string_literal: true

# S3Manager is a class responsible for managing S3 operations
# such as listing all S3 buckets in the current AWS account.
class S3Manager
  def initialize(client)
    @client = client
    @logger = Logger.new($stdout)
  end

  # Lists and prints all S3 buckets in the current AWS account.
  def list_buckets
    @logger.info('Here are the buckets in your account:')

    response = @client.list_buckets

    if response.buckets.empty?
      @logger.info("You don't have any S3 buckets yet.")
    else
      response.buckets.each do |bucket|
        @logger.info("- #{bucket.name}")
      end
    end
  rescue Aws::Errors::ServiceError => e
    @logger.error("Encountered an error while listing buckets: #{e.message}")
  end
end

if $PROGRAM_NAME == __FILE__
  s3_client = Aws::S3::Client.new
  manager = S3Manager.new(s3_client)
  manager.list_buckets
end

• 有关 API 的详细信息，请参阅 AWS SDK for Ruby API 参考ListBuckets中的。

Rust

适用于 Rust 的 SDK

注意

还有更多相关信息 GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。

/// S3 Hello World Example using the AWS SDK for Rust.
///
/// This example lists the objects in a bucket, uploads an object to that bucket,
/// and then retrieves the object and prints some S3 information about the object.
/// This shows a number of S3 features, including how to use built-in paginators
/// for large data sets.
///
/// # Arguments
///
/// * `client` - an S3 client configured appropriately for the environment.
/// * `bucket` - the bucket name that the object will be uploaded to. Must be present in the region the `client` is configured to use.
/// * `filename` - a reference to a path that will be read and uploaded to S3.
/// * `key` - the string key that the object will be uploaded as inside the bucket.
async fn list_bucket_and_upload_object(
    client: &aws_sdk_s3::Client,
    bucket: &str,
    filepath: &Path,
    key: &str,
) -> Result<(), S3ExampleError> {
    // List the buckets in this account
    let mut objects = client
        .list_objects_v2()
        .bucket(bucket)
        .into_paginator()
        .send();

    println!("key\tetag\tlast_modified\tstorage_class");
    while let Some(Ok(object)) = objects.next().await {
        for item in object.contents() {
            println!(
                "{}\t{}\t{}\t{}",
                item.key().unwrap_or_default(),
                item.e_tag().unwrap_or_default(),
                item.last_modified()
                    .map(|lm| format!("{lm}"))
                    .unwrap_or_default(),
                item.storage_class()
                    .map(|sc| format!("{sc}"))
                    .unwrap_or_default()
            );
        }
    }

    // Prepare a ByteStream around the file, and upload the object using that ByteStream.
    let body = aws_sdk_s3::primitives::ByteStream::from_path(filepath)
        .await
        .map_err(|err| {
            S3ExampleError::new(format!(
                "Failed to create bytestream for {filepath:?} ({err:?})"
            ))
        })?;
    let resp = client
        .put_object()
        .bucket(bucket)
        .key(key)
        .body(body)
        .send()
        .await?;

    println!(
        "Upload success. Version: {:?}",
        resp.version_id()
            .expect("S3 Object upload missing version ID")
    );

    // Retrieve the just-uploaded object.
    let resp = client.get_object().bucket(bucket).key(key).send().await?;
    println!("etag: {}", resp.e_tag().unwrap_or("(missing)"));
    println!("version: {}", resp.version_id().unwrap_or("(missing)"));

    Ok(())
}

S3 ExampleError 实用程序。

/// S3ExampleError provides a From<T: ProvideErrorMetadata> impl to extract
/// client-specific error details. This serves as a consistent backup to handling
/// specific service errors, depending on what is needed by the scenario.
/// It is used throughout the code examples for the AWS SDK for Rust.
#[derive(Debug)]
pub struct S3ExampleError(String);
impl S3ExampleError {
    pub fn new(value: impl Into<String>) -> Self {
        S3ExampleError(value.into())
    }

    pub fn add_message(self, message: impl Into<String>) -> Self {
        S3ExampleError(format!("{}: {}", message.into(), self.0))
    }
}

impl<T: aws_sdk_s3::error::ProvideErrorMetadata> From<T> for S3ExampleError {
    fn from(value: T) -> Self {
        S3ExampleError(format!(
            "{}: {}",
            value
                .code()
                .map(String::from)
                .unwrap_or("unknown code".into()),
            value
                .message()
                .map(String::from)
                .unwrap_or("missing reason".into()),
        ))
    }
}

impl std::error::Error for S3ExampleError {}

impl std::fmt::Display for S3ExampleError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

• 有关 API 的详细信息，请参阅适用ListBuckets于 Rust 的AWS SDK API 参考。

代码示例

• 基本功能

  • Hello Amazon S3

  • 了解基础知识

  • 操作

    • AbortMultipartUpload

    • CompleteMultipartUpload

    • CopyObject

    • CreateBucket

    • CreateMultiRegionAccessPoint

    • CreateMultipartUpload

    • DeleteBucket

    • DeleteBucketAnalyticsConfiguration

    • DeleteBucketCors

    • DeleteBucketEncryption

    • DeleteBucketInventoryConfiguration

    • DeleteBucketLifecycle

    • DeleteBucketMetricsConfiguration

    • DeleteBucketPolicy

    • DeleteBucketReplication

    • DeleteBucketTagging

    • DeleteBucketWebsite

    • DeleteObject

    • DeleteObjectTagging

    • DeleteObjects

    • DeletePublicAccessBlock

    • GetBucketAccelerateConfiguration

    • GetBucketAcl

    • GetBucketAnalyticsConfiguration

    • GetBucketCors

    • GetBucketEncryption

    • GetBucketInventoryConfiguration

    • GetBucketLifecycleConfiguration

    • GetBucketLocation

    • GetBucketLogging

    • GetBucketMetricsConfiguration

    • GetBucketNotification

    • GetBucketPolicy

    • GetBucketPolicyStatus

    • GetBucketReplication

    • GetBucketRequestPayment

    • GetBucketTagging

    • GetBucketVersioning

    • GetBucketWebsite

    • GetObject

    • GetObjectAcl

    • GetObjectAttributes

    • GetObjectLegalHold

    • GetObjectLockConfiguration

    • GetObjectRetention

    • GetObjectTagging

    • GetPublicAccessBlock

    • HeadBucket

    • HeadObject

    • ListBucketAnalyticsConfigurations

    • ListBucketInventoryConfigurations

    • ListBuckets

    • ListMultipartUploads

    • ListObjectVersions

    • ListObjects

    • ListObjectsV2

    • PutBucketAccelerateConfiguration

    • PutBucketAcl

    • PutBucketCors

    • PutBucketEncryption

    • PutBucketLifecycleConfiguration

    • PutBucketLogging

    • PutBucketNotification

    • PutBucketNotificationConfiguration

    • PutBucketPolicy

    • PutBucketReplication

    • PutBucketRequestPayment

    • PutBucketTagging

    • PutBucketVersioning

    • PutBucketWebsite

    • PutObject

    • PutObjectAcl

    • PutObjectLegalHold

    • PutObjectLockConfiguration

    • PutObjectRetention

    • RestoreObject

    • SelectObjectContent

    • UploadPart

    • UploadPartCopy

• 场景

  • 检查存储桶是否存在

  • 将文本转换为语音以及将语音转换回文本

  • 创建预签名 URL

  • 创建无服务器应用程序来管理照片

  • 创建列出 Amazon S3 对象的网页

  • 创建 Amazon Textract 浏览器应用程序

  • 删除存储桶中的所有对象

  • 删除未完成的分段上传

  • 检测图像中的 PPE

  • 检测从图像中提取的文本中的实体

  • 检测图像中的人脸

  • 检测图像中的对象

  • 检测视频中的人物和对象

  • 下载 S3 的 “目录”

  • 将对象下载到本地目录

  • 下载大小未知的直播

  • 从多区域接入点中获取对象

  • 如果对象已修改，则从桶中获取该对象

  • 加密入门

  • 标签入门

  • 锁定 Amazon S3 对象

  • 提出有条件的请求

  • 管理访问控制列表 (ACLs)

  • 使用 Lambda 函数批量管理版本控制对象

  • 解析 URIs

  • 执行分段复制

  • 处理 S3 事件通知

  • 保存 EXIF 和其他图像信息

  • 将事件通知发送至 EventBridge

  • 跟踪上传和下载操作

  • 使用 S3 对象 Lambda 转换数据

  • 使用 SDK 进行单元测试和集成测试

  • 将目录上传到存储桶

  • 上传或下载大文件

  • 上传未知大小的流

  • 使用校验和

  • 使用 Amazon S3 对象完整性

  • 处理版本控制对象

• 无服务器示例

  • 通过 Amazon S3 触发器调用 Lambda 函数