![]() The servlet FileUploadServlet.java can be found in the tut-install/examples/web/fileupload/src/java/fileupload/ directory. This is what submitted data from the fileupload form looks like, after selecting sample.txt as the file that will be uploaded to the tmp directory on the local file system:Ĭontent-Disposition: form-data name=”file” filename=”sample.txt”Ĭontent-Disposition: form-data name=”destination”Ĭontent-Disposition: form-data name=”upload” Parts are named after the input elements and are separated from each other with string delimiters named boundary. When submitting a form, the browser streams the content in, combining all parts, with each part representing a field of a form. A header field in the POST request usually indicates the message body’s Internet media type. This allows arbitrary-length data of any type to be sent to the server. In contrast, a GET request method sends a URL and headers only to the server, whereas POST requests also include a message body. Pressing the Upload button at the bottom of the form posts the data to the servlet, which saves the file in the specified destination.Ī POST request method is used when the client needs to send data to the server as part of the request, such as when uploading a file or submitting a completed form. The destination is the path to the location where the file will be saved on your computer. The servlet then handles the request to process the incoming file data and to extract a file from the stream. ![]() When the form is specified in this manner, the entire request is sent to the server in encoded form. During this process two mandatory restrictions are applied to the form with input type file:ġ.The enctype attribute must be set to a value of multipart/form-data. When the file is selected, it is sent to the server as a part of a POST request. The input type, file, enables a user to browse the local file system to select the file. This example includes a very simple HTML form with two fields, File and Destination. The fileupload example application consists of a single servlet and an HTML form that makes a file upload request to the servlet. The browser associates a Browse button with each of them.Īrchitecture of the fileupload Example Application. To allow multiple files uploading, include more than one input tags with different values for the name attribute.
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