Download file in spring boot

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. HttpHeaders; import org. MediaType; import org. ResponseEntity; import org. RequestMapping; import org. RequestMethod; import org. RequestParam; import org. RestController; import java. File; import java. IOException; import java. Files; import java. If you are on the internet then you definitely upload or download some files such as movies, songs, or any documents like pdf, images, etc.

These are very frequently used feature of any applications or software. Here we will build a Restful API for uploading and downloading the files and we also develop a very simple front end using Javascript for uploading and downloading the file.

And it is completely optional. You can skip if you are not interested or if you want to add front end code also in your application, then please download the Source code from the last section of this article. Note: Video Tutorial is available in the bottom section of this article. Note: You can change the path file.

If you are a developer and want to implement an upload feature on your project, then please change the upload storage file location as per your requirement. Spring Boot provides us a very unique feature to automatically bind or assign the properties values to parameter present in a Pojo Class.

To achieve this we need to use the ConfigurationProperties annotation in the Pojo Class as shown below. In order to enable this property, we need to add EnableConfigurationProperties annotation in the Main Class or the class which is tagged with SpringBootApplication or you can add the EnableConfigurationProperties to any other Configuration class. The multiple files upload internally invokes above method to repeat the single file upload.

We can also have a functionality to upload a. To add an extra parameter with file upload, we can append that extra parameter in the form data at the client-side and the same can be retrieved as a request param at the server-side. Below is an example where we appended the key as extraParam in the form data at client-side. For this, we need to have a database configuration first. Spring boot provides a very convenient way to do so by adding a few properties in application.

We will be using spring data JPA for our purpose. To save the uploaded file in the DB, we have a model class and we are using byte[] as a data type to save it in the DB. Below is the REST implementation for this. The implementation is similar to above logic except it has a DB call to save the file instead of saving it to the local file system.

You have already noticed the response of the file upload. The below implementation only difers in the process of getting the file from databse rather then a file system. While downloading multiple files, we can create a zip file in spring boot and download that zip file alone rather then downloading multiple files individually.

Here, we will be using ZipOutputStream from java. Below is the example. To test this functionality, we can make a GET request with name as a query parameter which includes all the file names that we want to be included in the final.

We tested the above implementation with Postman. But in my previous tutorial, we have created other tutorials to achieve the same functionality with popular Javascript framework and library. You can follow this article to implement the file uploading client with Angular and this tutorial with React Js.