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The Java file upload Servlet will contain a doPost method to handle the form submission. In this doPost method, the uploaded file is processed in parts. When the file has finished uploaded, the Java Servlet saves each part to a like-named file in the C:\upload\ folder on the server’s file system.

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The multipart processing capabilities of the Servlet are provided through the addition of the @MultipartConfig annotation at the start of the class. This annotation also allows the developer to set various file upload properties, such as the maxFileSize, maxRequestSize and the fileSizeThreshold.

The complete code for the file upload Servlet example is as follows:

Source : https://www.theserverside.com/blog/Coffee-Talk-Java-News-Stories-and-Opinions/Java-File-Upload-Servlet-Ajax-Example

Simple file uploads with Java Servlets and JSPs example
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