Question

我在MySQL表中将员工照片存储为具有员工ID的BLOB类型字段。我必须将这些Blob图像作为图像文件迁移到S3存储桶。我正在用Java检索该图像的InputStream对象。现在如何获取图像的扩展名和该图像的内容类型。如何将其上传到S3存储桶

Answer 1

我不确定是否可以识别图像扩展名，除非将其保存到文件系统中，因为它已保存为Blob。这是示例代码，您可以将其用于此类操作

AmazonS3 client = AmazonS3ClientBuilder.defaultClient();
    //Load the blob as a byte array
    byte [] imageData = <load the image data from db> ;// resultSet.getBytes("image");
    //create a input stream from byte array
    ByteArrayInputStream inputStream = new ByteArrayInputStream(imageData);
    //Create the buffered image from input stream
    BufferedImage image = ImageIO.read(inputStream);
    //File which you are going to save the image as
    File file = new File(String.format("$s/%s.png", folderLocation, fileName));
    //Regardless of your original image extension save the image as png as it's loseless 
    ImageIO.write(image, "PNG", file);
    //Create a s3 put request 
    PutObjectRequest request = new PutObjectRequest(bucketName, UUID.randomUUID().toString()+".png", file);
    //Upload to s3
    client.putObject(request);

如何将存储为mysql中的blob的映像上传到AWS S3存储桶

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