背景
公司有一套基於k8s的paas系統,現在pod中安裝了aws 命令行工具
RUN apk add py-pip && pip install awscli
可以使用命令直接get、put文件,如下:
由於java使用命令行時可能會出現卡死現象,所以這裏想使用aws提供的sdk來直接上傳下載文件。
默認有兩種方式,一種是程序中配置key:
BasicAWSCredentials awsCredentials = new BasicAWSCredentials(accessKey, awsSecretKey);
s3 = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(awsCredentials)).withRegion(Regions.DEFAULT_REGION).build();
另外一種如下:
s3 = AmazonS3ClientBuilder.standard().withCredentials(new ProfileCredentialsProvider()).withRegion(Regions.DEFAULT_REGION).build();
報錯
報錯一:java.lang.IllegalArgumentException: profile file cannot be null
原因:這裏是沒找到配置文件,~/.aws/credentials
解決方案:
在dorker中需要直接使用下面方式來初始化s3client
AmazonS3 s3Client = new AmazonS3Client();
或者
AmazonS3 s3Client = new AmazonS3Client(DefaultAWSCredentialsProviderChain.getInstance());
最終初始化代碼如下:
s3 = AmazonS3ClientBuilder.standard().withCredentials(DefaultAWSCredentialsProviderChain.getInstance()).withRegion(Regions.DEFAULT_REGION).build();
參考鏈接:
https://stackoverflow.com/questions/41796355/aws-error-downloading-object-from-s3-profile-file-cannot-be-null
報錯二:Amazon S3 exception: “The specified key does not exist”
詳細報錯:
com.amazonaws.services.s3.model.AmazonS3Exception:
The specified key does not exist.
(Service: Amazon S3; Status Code: 404; Error Code: NoSuchKey;
代碼如下:
public static void downloadFile(String fileName,String savePath) {
S3Object s3Object = s3.getObject(bucketName, fileName);
FileOutputStream fos = null;
try (S3ObjectInputStream s3input = s3Object.getObjectContent()){
fos = new FileOutputStream(new File(savePath));
byte[] read_buf = new byte[1024];
int read_len = 0;
while ((read_len = s3input.read(read_buf)) > 0) {
fos.write(read_buf, 0, read_len);
}
s3Object.close();
fos.close();
} catch (Exception e) {
log.warn("獲取文件異常:fileName={},savePath={}",fileName,savePath,e);
throw new AppException("獲取文件異常:fileName="+fileName+",savePath="+savePath);
} finally {
try{
if(fos!=null) {
fos.close();
}
}catch (IOException e){
log.warn("關閉文件流異常:fileName={},savePath={}",fileName,savePath,e);
}
}
}
原因:這裏是只找不到文件
解決方案:檢查s3上的文件路徑是否正確,
舉個例子:s3://bucket_name/aa/bb/mm.csv
這裏的fileName參數應該傳“aa/bb/mm.csv”;
報錯三:/data/xx/xx/aa.csv not exists
這個原因比較明顯,是目標文件找不到,請先確認號父目錄是否創建