在 中指定特定的登入資料提供者 AWS SDK for Java 2.x

預設供應商鏈結會依序檢查多個來源，這會新增延遲：

// The default provider chain checks might check multiple sources until it finds
// sufficient configuration.
S3Client s3Client = S3Client.builder().build();

// You can specify exactly where to look.
S3Client optimizedClient = S3Client.builder()
    .credentialsProvider(InstanceProfileCredentialsProvider.create())
    .build();

您需要使用非標準位置來存取登入資料組態：

// Use configuration from a custom file location.
S3Client s3Client = S3Client.builder()
    .credentialsProvider(ProfileCredentialsProvider.builder()
            .profileFile(ProfileFile.builder()
                    .content(Paths.get("/custom/path/to/configuration/file"))
                    .type(ProfileFile.Type.CONFIGURATION) // Expects all non-default profiles to be prefixed with "profile".
                    .build())
            .profileName("custom")
            .build())
    .build();

針對不同的服務用戶端使用不同的登入資料。例如，如果您的應用程式需要存取多個 AWS 帳戶或使用不同服務的不同許可：

// S3 client using one set of credentials.
S3Client s3Client = S3Client.builder()
    .credentialsProvider(ProfileCredentialsProvider.create("s3-readonly"))
    .build();

// DynamoDB client using different credentials.
DynamoDbClient dynamoDbClient = DynamoDbClient.builder()
    .credentialsProvider(ProfileCredentialsProvider.create("dynamodb-admin"))
    .build();

控制登入資料重新整理行為：

// Create a provider with custom refresh behavior.
StsAssumeRoleCredentialsProvider customRefreshProvider = 
    StsAssumeRoleCredentialsProvider.builder()
        .refreshRequest(AssumeRoleRequest.builder()
            .roleArn("arn:aws:iam::123456789012:role/my-role")
            .roleSessionName("custom-session")
            .build())
        .stsClient(StsClient.create())
        .asyncCredentialUpdateEnabled(true) // Use a background thread to prefetch credentials.
        .build();

S3Client s3Client = S3Client.builder()
    .credentialsProvider(customRefreshProvider)
    .build();