AWSs3文件上传，下载（Androiddemo），类似minio_怎么用s3客户端的指定目录下下载文件资源-CSDN文库

共2000个文件

class：2151个

rawproto：53个

xml：34个

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**正文** 在本文中，我们将深入探讨如何在Android应用程序中实现AWS S3（Amazon Simple Storage Service）的文件上传和下载功能，以及如何自定义服务器配置，包括设置IP、Access Key和Secret Key。让我们理解AWS S3的基本概念。 **AWS S3简介** AWS S3是一种云存储服务，允许开发者和企业存储和检索任意数量的数据，具有高可用性、耐用性和安全性。它提供了一个简单的Web服务接口，用于存储和检索任何数量的数据，无论何时何地都可以访问。 **S3 Transfer Utility** 为了简化文件上传和下载操作，AWS SDK提供了S3TransferUtility类。这是一个高级API，能够处理多线程上传和下载，以及断点续传。在Android应用中使用这个工具，可以极大地提高用户体验，因为它会自动处理网络中断和恢复。 **Android集成AWS S3** 1. **添加依赖**: 在Android项目的build.gradle文件中，添加AWS SDK for Android的依赖项。 ```groovy dependencies { implementation 'com.amazonaws:aws-android-sdk-s3:2.17.+' } ``` 2. **初始化**: 在应用的Application类中初始化AWS SDK，配置Region和CredentialsProvider。 ```java AWS.config = new AWS.Configuration.Builder() .region(Regions.US_EAST_1) // 设置AWS区域 .credentialsProvider(new CognitoCachingCredentialsProvider( getApplicationContext(), "YOUR_COGNITO_POOL_ID", // 替换为你的Cognito身份池ID Regions.US_EAST_1)) // 匹配上面的区域 .build(); ``` 如果你不使用Cognito，可以使用BasicAWSCredentials并传递Access Key和Secret Key。 3. **上传文件**: 使用S3TransferUtility上传文件。 ```java S3TransferUtility transferUtility = S3TransferUtility.create(this, AWS.config); Upload upload = transferUtility.upload( "your-bucket-name", // 存储桶名称 "path/to/your/file", // 目标路径 new File("/path/to/local/file")); // 本地文件路径 upload.setCancellationToken cancellationToken); // 可选：取消令牌 ``` 4. **下载文件**: 下载文件的步骤类似，使用S3TransferUtility.download()方法。 ```java S3TransferUtilityDownloadTask downloadTask = transferUtility.download( "your-bucket-name", // 存储桶名称 "path/to/your/file", // 源路径 new File("/path/to/local/file")); // 本地保存路径 downloadTask.setCancellationToken(cancellationToken); // 可选：取消令牌 ``` **自定义服务器配置** 在某些情况下，你可能需要连接到自定义的S3兼容服务器，例如MinIO。这时，你需要创建一个AmazonS3ClientBuilder实例，并指定服务器的端点、Access Key和Secret Key。 ```java AmazonS3 s3Client = AmazonS3ClientBuilder.standard() .withEndpointConfiguration(new EndpointConfiguration("http://your-server-ip:9000", "us-east-1")) .withCredentials(new AWSStaticCredentialsProvider( new BasicAWSCredentials("ACCESS_KEY", "SECRET_KEY"))) .build(); ``` 之后，你可以使用这个s3Client对象进行上传和下载操作。 **安全与最佳实践** - 总是使用IAM用户或角色的最小权限访问S3。 - 对敏感数据进行加密，无论是客户端加密还是服务器端加密。 - 定期审计S3存储桶的权限和访问控制列表（ACLs）。在实际项目中，你需要根据需求对上述代码进行适当的修改和扩展，确保与你的业务逻辑和安全策略相匹配。同时，不要忘记在发布应用程序之前删除或替换示例中的敏感信息，如Access Key和Secret Key。总结，AWS S3在Android应用中的集成可以通过S3TransferUtility简化文件上传和下载，同时允许自定义服务器配置，以适应各种云存储场景。遵循最佳实践，确保应用程序的安全性与性能。

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AWS s3 文件上传，下载（Android demo），类似minio （2000个子文件）

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GsonBuilder.class 9KB

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Running S3TransferUtility Sample ============================================= This sample demonstrates how to use the high-level class TransferUtility to perform download and upload tasks and manage the tasks. You can also follow the tutorial for a step-by-step guide in understanding the S3TransferUtilitySample. 1. Create a identity pool * Go to https://console.aws.amazon.com/cognito/ and create a new identity pool. Make sure to enable access to unauthenticated identities and use the default roles. * Download the starter code at the last step of the wizard. * The starter code, has your Identity Pool ID. Keep this, you will need to add it to the sample later. 2. Set up permissions * Go to https://console.aws.amazon.com/iam/home and select "Roles". * Select the unauthenticated role you just created in step 1. * Select "Attach Policy", then find "AmazonS3FullAccess" and attach it it to the role. * Note: This will grant users in the identity pool full access to all buckets and operations in S3. In a real app, you should restrict users to only have access to the resources they need. 3. Create a bucket * Go to https://console.aws.amazon.com/s3/home * Create a bucket with a name you want. 4. Import the sample project * Import the sample as Android project into your IDE of choice. * Open com.amazonaws.demo.s3transferutility.Constants.java. * Update "COGNITO_POOL_ID" with the value you got from step 1. * Update "COGNITO_POOL_REGION" with the region of your cognito identity pool from step 1. For example, `us-east-1`. * Update "BUCKET_NAME" with the value in step 3. * Update "BUCKET_REGION" with the region of your s3 bucket from step 3. For example, `us-east-1`. 5. Import the AWS SDK for Android * You can download the newest AWS Android SDK from http://aws.amazon.com/mobile/sdk/ and copy the jars into libs directory. Include the following jars + aws-android-sdk-core-X.X.X.jar + extras/aws-android-sdk-cognito-X.X.X.jar + aws-android-sdk-s3-X.X.X.jar 6. Run the sample 上传下载代码示例（上传两种方式，下载两种方式） ============================================ 一、Uploading To upload an object to Amazon S3, use the AmazonS3EncryptionClient you initialized, and then use either PutObjectRequest or TransferUtility. 1.Using PutObjectRequest Java: final PutObjectRequest putObjectRequest = new PutObjectRequest(<bucketName>, <key>, <file>); final PutObjectResult putObjectResult = s3Client.PutObject(putObjectRequest); 2.Using TransferUtility Java: final TransferUtility transferUtility = new TransferUtility(s3Client, <context>); final TransferObserver transferObserver = transferUtility .upload(<bucketName>, <key>, <file>); 二、Downloading To download an object from Amazon S3, use the AmazonS3EncryptionClient you initialized earlier, and then use either GetObjectRequest or TransferUtility. 1.Using GetObjectRequest Java: final InputStream inputStream = s3Client.getObject(<bucketName>, <key>).getObjectContent(); 2.Using TransferUtility: Java: final File tempDownloadFile = temp.newFile(); final TransferObserver observer = transferUtility .download(<bucketName>, <key>, <tempDownloadFile>);

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