How does Java obtain the object content type? For example: image/gif, javaimage

How does Java obtain the object content type? For example: image/gif, javaimage
After a website uploads a file, if it is an image, it must process the file, compress, scale, and so on.
Import java. nio. file .*;

// If it is an image file, perform the scaling process Path source = Paths. get (newFilePath); String contentType = Files. probeContentType (source); if (contentType. startsWith ("image") {String thumbPath = this. getImgAbsolutePath (request, "thumb"); ImageUtils. resize (maid, thumbPath, 94,222, true );}

In java, how does one store an image-format object into a specific file?

ObjectOutPutStream is not necessarily related to "saving to actual files.
Only ObjectOutPutStream links a File... can be used to "save to the actual File"


How to pass parameters to the Image data type in Java

Upload an Image object
You can obtain Image objects in the following ways:
Image img = Toolkit. getDefaultToolkit. createImage (String filename );
Image img = Toolkit. getDefaultToolkit. createImage (URL url );
Image img = ImageIO. read (File file );
Image img = ImageIO. read (URL url );