Java implementation of uploading pictures for cutting

This paper describes the method of uploading pictures for cutting in Java. Share with you for your reference. The specific analysis is as follows:

Why should I cut the uploaded image? The image of my project is the Department logo, and each department can choose a different logo. However, to cope with the compatibility and stretching of the browser, I chose to cut a picture into left, middle, right and the rest, because there may be patterns or words on the left and middle changes, so it can't be stretched, Only the right part is stretched, and the rest is adaptive. Therefore, the imagereader of javax is used to operate. Finally, it is saved in the database as blob type. First, write enctype = "multipart / form data" in the form