javaamazon-s3downloadjava-web-start

Download file help for AWS S3 Java SDK


The code below only works for downloading text files from a bucket in S3. This does not work for an image. Is there an easier way to manage downloads/types using the AWS SDK? The example included in the documentation does not make it apparent.

AWSCredentials myCredentials = new BasicAWSCredentials(
       String.valueOf(Constants.act), String.valueOf(Constants.sk)); 
AmazonS3Client s3Client = new AmazonS3Client(myCredentials);        
S3Object object = s3Client.getObject(new GetObjectRequest("bucket", "file"));
    
BufferedReader reader = new BufferedReader(new InputStreamReader(
       object.getObjectContent()));
File file = new File("localFilename");      
Writer writer = new OutputStreamWriter(new FileOutputStream(file));
    
while (true) {          
     String line = reader.readLine();           
     if (line == null)
          break;            
     
     writer.write(line + "\n");
}
    
writer.close();

Solution

  • Instead of Reader and Writer classes you should be using InputStream and OutputStream classes:

    InputStream reader = new BufferedInputStream(
       object.getObjectContent());
    File file = new File("localFilename");      
    OutputStream writer = new BufferedOutputStream(new FileOutputStream(file));
    
    int read = -1;
    
    while ( ( read = reader.read() ) != -1 ) {
        writer.write(read);
    }
    
    writer.flush();
    writer.close();
    reader.close();