![]() ![]() Since we need to read context parameter for file location and create a File object from it, we can write a ServletContextListener to do it when context is initialized. ServletContextListener for File Upload Location Also we will add our upload file html page to the welcome file list. We need to store file into some directory at server, we can have this directory hardcoded in program but for better flexibility, we will keep it configurable in deployment descriptor context params. So we can have a simple HTML page index.html for uploading file as: ![]() To select a file from user file system, we need to use input element with type as file. Another point to note is that enctype of form should be multipart/form-data. ![]() We can’t use GET method for uploading file. We can upload a file to server by sending a post request to servlet and submitting the form. HTML Page for Java Uploading File to Server Let’s look into all the components of our web application and understand the implementation. We will create a dynamic web project in Eclipse and the project structure will look like below image. For security reason, user will not be provided direct URL for downloading the file, rather they will be given a link to download the file and our servlet will process the request and send the file to user. On submission of request to upload the file, our servlet program will upload the file into a directory in the server and then provide the URL through which user can download the file. Our use case is to provide a simple HTML page where client can select a local file to be uploaded to server. Since I have written a lot about java servlet recently, I thought to provide a sample example of servlet file upload to server and then download from server to client. Servlet Upload File and Download File is a common task in java web application. ![]()
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