如何使用Java SDK访问受IAM角色保护的S3 Bucket？

import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;

// 初始化AmazonS3Client对象
AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                    .withCredentials(DefaultAWSCredentialsProviderChain.getInstance())
                    .withRegion(Regions.US_EAST_1)
                    .build();

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.AssumeRoleRequest;
import com.amazonaws.auth.BasicSessionCredentials;
import com.amazonaws.services.securitytoken.AWSSecurityTokenService;
import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClientBuilder;
import com.amazonaws.services.securitytoken.model.AssumeRoleResult;

// 创建AssumeRoleRequest对象
AssumeRoleRequest assumeRoleRequest = new AssumeRoleRequest()
                    .withRoleArn("arn:aws:iam::ACCOUNT_ID:role/ROLE_NAME")
                    .withRoleSessionName("SESSION_NAME");

// 初始化AWSSecurityTokenService客户端
AWSSecurityTokenService stsClient = AWSSecurityTokenServiceClientBuilder.standard()
                    .withCredentials(DefaultAWSCredentialsProviderChain.getInstance())
                    .withRegion(Regions.US_EAST_1)
                    .build();

// 调用AssumeRole方法获取临时凭证
AssumeRoleResult assumeRoleResult = stsClient.assumeRole(assumeRoleRequest);

// 从AssumeRoleResult中获取临时凭证
AWSCredentials sessionCredentials = new BasicSessionCredentials(
                    assumeRoleResult.getCredentials().getAccessKeyId(),
                    assumeRoleResult.getCredentials().getSecretAccessKey(),
                    assumeRoleResult.getCredentials().getSessionToken());

// 使用临时凭证更新AmazonS3Client对象的凭证
s3Client.setCredentials(new AWSStaticCredentialsProvider(sessionCredentials));

// 使用AmazonS3Client对象访问S3 Bucket
List<Bucket> buckets = s3Client.listBuckets();
for (Bucket bucket : buckets) {
    System.out.println(bucket.getName());
}