Spring boot file download

Thanks for all this great content, really comprehensive and beginner-friendly. Can you please share an example code of how to build a spring web application to upload any excel file, contents of which we do not know in advance?

How can we create an entity with no certain primary key, column names, etc.? First of all, greetings from Brazil and thank you so much for this tutorial. Well, in my case, in the controller, the length of List of files was returning a integer. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Necessary cookies are absolutely essential for the website to function properly.

This category only includes cookies that ensures basic functionalities and security features of the website. Viewed k times. I am trying to download a file from a Spring boot rest service. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. I am trying to do it for word document. Any suggestion? Create a Configuration class that extends WebMvcConfigurerAdapter , implement the configureMessageConverters method and add a converters.

Questions: Option 1 does not seem to close the stream. Where is the magic? Option 2 seems to load the complete file into memory before sending. See this: stackoverflow. Show 1 more comment. The below Sample code worked for me and might help someone.

ByteArrayResource; import org. Resource; import org. Sheet ; import org. Workbook ; import org. XSSFWorkbook ; import simplesolution. In order to public the web page for downloading Excel file we create the DownloadExcelController as below.

ArrayList ; import java. List ; import javax. HttpServletResponse ; import org. Here I have used a few more new classes which I will be explaining in a later section of this article, so if you get any compilation issues, ignore them for the moment.

There are two important methods in the Service class; one is storeFile , which will store the file at the required location and save the file details in the database. Before storing the file, we will check whether a user has already given the type of file available, and if it is available, then replace the latest file on a server and update the database with the latest information.

Otherwise, it will create a new entry in the database and save the file at the required location. The second method is loadFileAsResource which returns the file as a Resource on the basis of file name given. Also, we have an autowired repository object to this service which we have created in thr previous step and autowired fileStorageLocation on basis of upload-dir properties. Now let's create a controller that will handle the HTTP request and send the proper response back.