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如何生成使用临时安全凭证签名的HTTPS API请求（URL）以访问AWS S3对象。我能够使用Amazon Java SDK访问对象，但我想使用临时安全凭证（如预签名的url）生成完整的url。包com.siriusxm.repo.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import com.amazonaws.auth.BasicSessionCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Region;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient;
import com.amazonaws.services.securitytoken.model.Credentials;
import com.amazonaws.services.securitytoken.model.GetSessionTokenRequest;
import com.amazonaws.services.securitytoken.model.GetSessionTokenResult;
import com.siriusxm.repo.DownloadServiceImpl;

public class TemporaryCredential {

    private static String bucketName = "myrepo"; 
    private static String key  =  "test.pdf";

    public static void main(String[] args) {
        System.out.println("");

        AWSSecurityTokenServiceClient stsClient = new AWSSecurityTokenServiceClient(
                new ProfileCredentialsProvider());
    //  stsClient.setRegion(regionName);sts.us-west-2.amazonaws.com
        //
        // Start a session.
        GetSessionTokenRequest getSessionTokenRequest = new GetSessionTokenRequest();
        GetSessionTokenResult sessionTokenResult = …