使用AWS SDK for Java 上傳和下載文件。 已有 amazonaws.cn 中國區賬號。
本文敘述了怎樣獲取訪問密鑰,進行demo配置,demo運行出錯的解決辦法。
1. 獲取訪問密鑰
登錄 https://console.amazonaws.cn/iam/home,點擊左側“用戶”,選擇自己的賬號;點擊“安全證書”,可以看到下方有訪問密鑰,我的賬號只能申請2個密鑰,之前的key已經不知道了,刪掉舊的申請個新的即可。得到的就是aws_access_key_id 和 aws_secret_access_key 。
2. 配置密鑰
2.1 配置文件方式
參考文章 http://docs.aws.amazon.com/zh_cn/sdk-for-java/v1/developer-guide/setup-credentials.html,在本地系統上的 AWS 憑證配置文件中設置憑證,該配置文件位於:
~/.aws/credentials (在 Linux、macOS 或 Unix) 上
C:\Users\USERNAME\.aws\credentials (在 Windows 上)
文件包含以下格式的行,用自己的 AWS 憑證值替換值 your_access_key_id 和 your_secret_access_key。
[default]
aws_access_key_id = your_access_key_id
aws_secret_access_key = your_secret_access_key
AmazonS3 的初始化
AmazonS3 s3client = new AmazonS3Client(new ProfileCredentialsProvider());
2.2 參數方式
官方文檔中給出的密鑰配置方式需要在特定目錄下放置配置文件,工程部署不方便。找了參數方式初始化的方法。
AWSCredentials credentials = new BasicAWSCredentials(
myConfig.AWS_ACCESS_KEY_ID, myConfig.AWS_SECRET_ACCESS_KEY);
AmazonS3 s3Client = new AmazonS3Client(credentials);
3. 我的第一個上傳demo
參考官方文檔
http://docs.aws.amazon.com/zh_cn/AmazonS3/latest/dev/UploadObjSingleOpJava.html,
在自己的工程裏新建了UploadObjectSingleOperation類,需要配置的三項如下:
private static String bucketName = "手動在AWS S3中創建的桶名稱";
private static String keyName = "希望這個文件上傳後的key,需要注意的,這個key不要重複,否則會覆蓋掉舊的文件";
private static String uploadFileName = "待上傳的本地文件路徑和名稱";
依賴包(gradle)
// https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk-s3
compile group: 'com.amazonaws', name: 'aws-java-sdk-s3', version: '1.11.238'
Demo失敗原因1
java.lang.reflect.InvocationTargetException: null
……
Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to englishresourcebucket.s3.amazonaws.com:443 [englishresourcebucket.s3.amazonaws.com/54.231.33.147] failed: Read timed out
……
Caused by: java.net.SocketTimeoutException: Read timed out
解決辦法,設置區域:
String regionName = "cn-north-1";
Region region = Region.getRegion(Regions.fromName(regionName));
s3client.setRegion(region);
String serviceEndpoint = region.getServiceEndpoint(ServiceAbbreviations.S3);
s3client.setEndpoint(serviceEndpoint);
s3client.putObject(new PutObjectRequest(bucketName, keyName, file));
4. 文件下載
參考官方文檔,
http://docs.aws.amazon.com/zh_cn/AmazonS3/latest/dev/GettingObjectsUsingAPIs.html
http://docs.aws.amazon.com/zh_cn/AmazonS3/latest/dev/RetrievingObjectUsingJava.html GetObject.java
同樣的也加上區域設置的代碼,就可以跑通這段demo了。
5. 我的Demo
private AmazonS3 s3Client;
private String bucketName;
public S3Service(MyConfig myConfig) {
AWSCredentials credentials = new BasicAWSCredentials(
myConfig.AWS_ACCESS_KEY_ID, myConfig.AWS_SECRET_ACCESS_KEY);
s3Client = new AmazonS3Client(credentials);
String regionName = myConfig.AWS_REGION;
Region region = Region.getRegion(Regions.fromName(regionName));
s3Client.setRegion(region);
final String serviceEndpoint = region.getServiceEndpoint(ServiceAbbreviations.S3);
s3Client.setEndpoint(serviceEndpoint);
bucketName = myConfig.AWS_BUCKET_NAME;
}
public void upload(MultipartFile file, String keyName)
throws MyException {
ObjectMetadata metadata = new ObjectMetadata();
metadata.setContentType(file.getContentType());
metadata.setContentLength(file.getSize());
try {
s3Client.putObject(new PutObjectRequest(
bucketName, keyName, file.getInputStream(), metadata));
} catch (AmazonServiceException ase) {
logger.warn("Caught an AmazonServiceException, which " +
"means your request made it " +
"to Amazon S3, but was rejected with an error response" +
" for some reason.");
logger.warn(printAse(ase));
throw new MyException ("upload file failed",
MyExceptionType.AWS_UPLOAD_FAILED);
} catch (AmazonClientException ace) {
logger.warn("Caught an AmazonClientException, which " +
"means the client encountered " +
"an internal error while trying to " +
"communicate with S3, " +
"such as not being able to access the network.");
logger.warn("Error Message: " + ace.getMessage());
throw new MyException ("upload file failed",
MyExceptionType.AWS_UPLOAD_FAILED);
} catch (IOException ioe) {
logger.warn("Caught an IOException: " + ioe.getMessage());
throw new MyException ("upload file failed",
MyExceptionType.AWS_UPLOAD_FAILED);
}
}