AWS Credentials 使用

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To connect to any of the supported services with the AWS SDK for Java, you must provide AWS credentials. The AWS SDKs and CLIs use provider chains to look for AWS credentials in a number of different places, including system/user environment variables and local AWS configuration files.

This topic provides basic information about setting up your AWS credentials for local application development using the AWS SDK for Java. If you need to set up credentials for use within an EC2 instance or if you're using the Eclipse IDE for development, refer to the following topics instead:

• When using an EC2 instance, create an IAM role and then give your EC2 instance access to that role as shown in Using IAM Roles to Grant Access to AWS Resources on Amazon EC2.
• Set up AWS credentials within Eclipse using the AWS Toolkit for Eclipse. See Set up AWS Credentials in theAWS Toolkit for Eclipse User Guide for more information.

Setting AWS Credentials#

Setting your credentials for use by the AWS SDK for Java can be done in a number of ways, but here are the recommended approaches:

• Set credentials in the AWS credentials profile file on your local system, located at:

  • ~/.aws/credentials on Linux, macOS, or Unix
  • C:UsersUSERNAME.awscredentials on Windows

  This file should contain lines in the following format:

  [default]
  aws_access_key_id = your_access_key_id
  aws_secret_access_key = your_secret_access_key
  

  Substitute your own AWS credentials values for the values your_access_key_id andyour_secret_access_key.

• Set the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.

  To set these variables on Linux, macOS, or Unix, use export:

  export AWS_ACCESS_KEY_ID=your_access_key_id
  export AWS_SECRET_ACCESS_KEY=your_secret_access_key
  

  To set these variables on Windows, use set:

  set AWS_ACCESS_KEY_ID=your_access_key_id
  set AWS_SECRET_ACCESS_KEY=your_secret_access_key
  

• For an EC2 instance, specify an IAM role and then give your EC2 instance access to that role. See IAM Roles for Amazon EC2 in the Amazon EC2 User Guide for Linux Instances for a detailed discussion about how this works.

Once you have set your AWS credentials using one of these methods, they will be loaded automatically by the AWS SDK for Java by using the default credential provider chain. For further information about working with AWS credentials in your Java applications, see Working with AWS Credentials.

Setting the AWS Region#

You should set a default AWS Region that will be used for accessing AWS services with the AWS SDK for Java. For the best network performance, you should choose a region that's geographically close to you (or to your customers).

Note

If you don't select a region, then us-east-1 will be used by default.

You can use similar techniques to setting credentials to set your default AWS region:

• Set the AWS region in the AWS config file on your local system, located at:

  • ~/.aws/config on Linux, macOS, or Unix
  • C:UsersUSERNAME.awsconfig on Windows

  This file should contain lines in the following format:

  [default]
  region = your_aws_region
  

  Substitute your desired AWS region (for example, "us-west-2") for your_aws_region.

• Set the AWS_REGION environment variable.

  On Linux, macOS, or Unix, use export:

  export AWS_REGION=your_aws_region
  

  On Windows, use set:

  set AWS_REGION=your_aws_region
  

  Where your_aws_region is the desired AWS region name.
  

  来源： http://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html

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