Servlet Upload File and Download File Example. Servlet Upload File and Download File is a common task in java web application. 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.

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Our use case is to provide a simple HTML page where client can select a local file to be uploaded to server. 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.

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. We will create a dynamic web project in Eclipse and the project structure will look like below image.

Let’s look into all the components of our web application and understand the implementation. HTML Page for Java Uploading File to Server.

We can upload a file to server by sending a post request to servlet and submitting the form. We can’t use GET method for uploading file. Another point to note is that enctype of form should be multipart/form- data. To select a file from user file system, we need to use input element with type as file. So we can have a simple HTML page index. Also we will add our upload file html page to the welcome file list.

Our web. xml file will look like below: < ? We can set absolute directory location and File object as context attribute to be used by other servlets. Our Servlet. Context. Listener implementation code is like below. File. import javax. Servlet. Context. Servlet. Context.

Event. import javax. Servlet. Context.

Listener. import javax. Web. Listener. public class File. Location. Context. Listener implements Servlet. Context. Listener .

Please check out Servlet 3 Upload File. For File upload, we will use Apache Commons File. Upload utility, for our project we are using version 1. File. Upload depends on Apache Commons IO jar, so we need to place both in the lib directory of the project, as you can see that in above image for project structure. Windows Xp Professional Corporate Pl Sp3 For Windows. We will use Disk. File. Item. Factory factory that provides a method to parse the Http.

Servlet. Request object and return list of File. Item. File. Item provides useful method to get the file name, field name in form, size and content type details of the file that needs to be uploaded. To write file to a directory, all we need to do it create a File object and pass it as argument to File. Item write() method. Since the whole purpose of the servlet is to upload file, we will override init() method to initialise the Disk. File. Item. Factory object instance of the servlet.

We will use this object in the do. Post() method implementation to upload file to server directory. Once the file gets uploaded successfully, we will send response to client with URL to download the file, since HTML links use GET method,we will append the parameter for file name in the URL and we can utilise the same servlet do. Get() method to implement file download process. For implementing download file servlet, first we will open the Input.

Stream for the file and use Servlet. Context. get. Mime. Type() method to get the MIME type of the file and set it as response content type. We will also need to set the response content length as length of the file. To make sure that client understand that we are sending file in response, we need to set “Content- Disposition” header with value as “attachment; filename=”file. Name”. Once we are done with setting response configuration, we can read file content from Input. Stream and write it to Servlet.

Output. Stream and the flush the output to client. Our final implementation of Upload.

Download. File. Servlet servlet looks like below. File. import java. File. Input. Stream. IOException. import java. Input. Stream. import java. Print. Writer. import java.

Iterator. import java. List. import javax.

Servlet. Context. Boss Gt 6 Patches Settings Firefox. Servlet. Exception. Servlet. Output. Stream. Web. Servlet. import javax. Http. Servlet. import javax. Http. Servlet. Request.

Http. Servlet. Response. File. Item. import org. File. Upload. Exception. Disk. File. Item.

Factory. import org. Servlet. File. Upload.