How to make a file download in a servlet

Connect and share knowledge within a single location that is structured and easy to search. The idea is that with the GET request index. That depends. If said file is publicly available via your HTTP server or servlet container you can simply redirect to via response.

The easiest way to implement the download is that you direct users to the file location, browsers will do that for you automatically. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Implementing a simple file download servlet [duplicate] Ask Question. Asked 12 years, 2 months ago. Active 1 year, 4 months ago.

Viewed k times. Improve this question. AlvinArulselvan 4 4 silver badges 15 15 bronze badges. You should give serious consideration to the security risks involved. Interview Questions. Company Questions.

Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. FileItem 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 FileItem write method.

Since the whole purpose of the servlet is to upload file, we will override init method to initialise the DiskFileItemFactory object instance of the servlet. We will use this object in the doPost 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 doGet method to implement file download process.

For implementing download file servlet, first we will open the InputStream for the file and use ServletContext. We will also need to set the response content length as length of the file. Once we are done with setting response configuration, we can read file content from InputStream and write it to ServletOutputStream and the flush the output to client.

Httpservletresponse Download File Servlet Download Zip File Example Servlet Download File Example The example below is a servlet that shows you how to create a zip file and send the generated zip file for user to download. Httpservletresponse Download File Search Download servlet-api. Related examples in the same category 1. Download servlet Download servlet-examples-jetty Download servlet-examples-war Download servlet-mapping-sip-servlet Download servlet-examples-tomcat Download servlet-api Download servlet-asset-fingerprinting