要解决此问题，需在 AWS 请求中包含最新的安全令牌。以下是使用 AWS Java SDK 更新令牌的示例代码：

import com.amazonaws.auth.BasicSessionCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.S3ObjectInputStream;

public class S3Example {
    private static final String ACCESS_KEY = "YOUR_ACCESS_KEY";
    private static final String SECRET_KEY = "YOUR_SECRET_KEY";
    private static final String SESSION_TOKEN = "YOUR_SESSION_TOKEN";

    public static void main(String[] args) {
        BasicSessionCredentials sessionCredentials = new BasicSessionCredentials(ACCESS_KEY, SECRET_KEY, SESSION_TOKEN);

        AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(sessionCredentials))
                .withRegion(Regions.US_EAST_1)
                .build();

        S3Object s3Object = s3Client.getObject("my-bucket-name", "my-object-key");
        S3ObjectInputStream inputStream = s3Object.getObjectContent();
        // Do something with the input stream

        inputStream.close();
    }
}

在代码中使用 BasicSessionCredentials 类创建新令牌对象，并将其添加到 AmazonS3ClientBuilder 对象中。然后使用该对象创建 AmazonS3 客户端。在请求中使用从此客户端获得的新令牌，可以避免出现“安全令牌已过期”的错误。