It's possible to convert an Image object To FormFile object ..?
Are you referring to the Apache Struts FormFile? If so, then you'd probably want to be creating a CommonsMultipartRequestHandler.CommonsFormFile which simply wraps an implementation of the FileItem interface, the only one of which I could find (that isn't deprecated) is a DiskFileItem. But this is for content that's been received within a multipart/form-data POST request, and not something that I would have thought you'd have an Image object for. Which makes me wonder what exactly you're trying to accomplish.
update:
Based on your feedback I would imagine you could create a BufferedImage object based on the FileItem, which should then be able to be manipulated:
InputStream is = fileItem.getInputStream();
BufferedImage image = ImageIO.read(is);
Once you're happy with the BufferedImage that you've tweaked you can write it to the file system using ImageIO.write().
Related
I am trying to upload a Flux object into azure blob storage, but I'm not sure how to send a Flux pojo using BlobAsyncClient. BlobAsyncClient has upload methods that take Flux or BinaryData but I have no luck trying to convert CombinedResponse to BYteBuffer or BinaryData. Does anyone have any suggestions or know how to upload a flux object to blob storage?
You will need an asynch blob container client:
#Bean("blobServiceClient")
BlobContainerAsyncClient blobServiceClient(ClientSecretCredential azureClientCredentials, String storageAccount, String containerName) {
BlobServiceClientBuilder blobServiceClientBuilder = new BlobServiceClientBuilder();
return blobServiceClientBuilder
.endpoint(format("https://%s.blob.core.windows.net/", storageAccount))
.credential(azureClientCredentials)
.buildAsyncClient()
.getBlobContainerAsyncClient(containerName);
}
And in your code you can use it to get a client, and save your Flux to it:
Flux<ByteBuffer> content = getContent();
blobServiceClient.getBlobAsyncClient(id)
.upload(content, new ParallelTransferOptions(), true);
I get that the getContent() step is the part you are struggling with. You can save either a BinaryData object or a Flux<ByteBuffer> stream.
To turn your object into a BinaryData object, use the static helper method:
BinaryData foo = BinaryData.fromObject(myObject);
BinaryData is meant for exactly what the name says: binary data. For example the content of an image file.
If you want to turn it into a ByteBuffer, keep in mind that you're trying to turn an object into a stream of data here. You will probably want to use some standardized way of doing that, so it can be reliably reversed, so rather than a stream of bytes that may break if you ever load the data in a different client, or even just a different version of the same, we usually save a json or xml representation of the object.
My go-to tool for this is Jackson:
byte[] myBytes = new ObjectMapper().writeValueAsBytes(myObject);
var myByteBuffer = ByteBuffer.wrap(myBytes);
And return it as a Flux:
Flux<ByteBuffer> myFlux = Flux.just(myByteBuffer);
By the way, Azure uses a JSON serializer under the hood in the BinaryData.fromObject() method. From the JavaDoc:
Creates an instance of BinaryData by serializing the Object using the default JsonSerializer.
Note: This method first looks for a JsonSerializerProvider
implementation on the classpath. If no implementation is found, a
default Jackson-based implementation will be used to serialize the object
I have a Web Service that takes a photo through a POST statement and returns a modified copy of that photo back. We are making changes to the way it processes the photo, and I want to verify that the photo at least has different properties coming back than it did before our changes went into effect.
The photo is being returned as a byte stream inside one of the fields of a JSON object. I can analyze the JSON object pretty easily, but I'm trying to figure out how to get the byte stream into an Java image object so that I can get its dimensions.
Possible duplicate of this question
... I'm trying to figure out how to get the byte stream into an Java image object so that i can get its dimensions.
I'd suggest using a BufferedImage in the following format/snippet. Note: I load my image in from disk for the example and use try-with-resources (which you may revert to 1.6-prior if needed).
String fp = "C:\\Users\\Nick\\Desktop\\test.png";
try (FileInputStream fis = new FileInputStream(new File(fp));
BufferedInputStream bis = new BufferedInputStream(fis)) {
BufferedImage img = ImageIO.read(bis);
final int w = img.getWidth(null);
final int h = img.getHeight(null);
}
You can use:
OS Process Sampler and 3rd-party tool like ImageMagick
JSR223 Test Elements, to wit
JSR223 PreProcessor to get information on the photo, you're trying to upload
JSR223 PostProcessor to get information on the photo, returned by the Web Service
JSR223 Assertion to compare two photos
Depending on what parameters you need to compare you can use ImageIO API (out of the box, bundled with JDK), Commons Imaging, ImageJ and so on.
I would like to know if is possible get the image via POST method with a HTTP server implemented in Java (With a simple input file form). I already implemented the Java server but I can only get text files via POST method it's because that the my application only copies the file content to another empty file creating the same file with the same characteristics. This does not work with image file or other files, this can only work with text file.
Anyone know how to implement it with images?
Some coordinates would be of great help!
Thanks in advance!
As far as i know you should create something like it:
Server-side: If you use a servlet that receive data in post you have to get the outputStream from the response. Once you have it it is done because you write the data image on the stream.
For example let's suppose your image is a file stored in the server you could do:
response.setContentLength((int) fileSize);
byte b[] = new byte[1024];
while ( fOutStream.read(b) != -1)
response.getOutputStream().write(b);
fOutStream.close() ;
Where the fOutStream is the source stream (your image).
I have image data coming in from over a socket connection as a byte[]. All examples I have seen using cvLoadImage() is passed a file name. Do I have to save every image to file and re-open it to do the processing? This seems to have a lot of overhead for what needs to happen, is it possible to load the image from the byte[] data?
Simple solution in the end, you can use the following method to create an Image from a BufferedImage which solved my problem:
IplImage src = IplImage.createFrom(buffered);
Assuming the data is encoded in some standard format like JPG or PNG, and assuming you are using JavaCV, for a byte array b, this works as well:
IplImage image = cvDecodeImage(cvMat(1, b.length, CV_8UC1, new BytePointer(b)));
I am a newer for java, now I need to write a software related with image process with java. I want to get the valid image dataļ¼for example:a bitmap named "abc.bmp", it include filehead, infohead, RGBquad and valid image data. What I want is just valid image data, so one solution is knowing the image format, then get the data. But this is really bottom, I know Java has a lot of standard class, so I hope that I can just use a class variable to get the valid data, no care about the image format.OK, in my code, now I get a image object through these code:
String imageName;
File imageFile = new File(imageName);
Image image = ImageIO.read(imageFile);
so how can i get the valid data from the object---"image" or need use other class?
thank you!