Spring web download files

Contains example of using WebClient to read a stream of a very large file and store it on the disk. This tutorial focuses on accessing a large file from an external service using Spring WebClient. We will first study using Mono publisher to download a file in the form of byte[] byte array. We will also understand why this method is not suitable for downloading large files. Next, we will focus on Spring DataBuffer classes and their role in the data transfer process.

Lastly, we will study how to use Flux publisher to download a very large file in chunks of DataBuffer. We are providing the base url of a file server.

When we read a file in Java, it is held in the form of byte arrays byte[]. Hence, reading the content from response as a byte[] is the most simple way. Here, we used Spring WebClient to access a file from an URL, read the file contents in the form of a byte array, and write it to a file on the disk. Although we have covered it as an example, we do not recommend using byte[] way for large files.

Here we are using annotation to define the controller classes and its request handler. To process all the annotation we have provided base package com. Simple Spring Mvc controller to download the file. Follow below steps to download the sample "abc. Hi there! I am founder of technicalkeeda. If you have any idea that you would want me to develop?

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.

ResponseEntity; import org. RequestMapping; import org. RequestMethod; import org. RequestParam; import org. RestController; import java. File; import java. IOException; import java.

Files; import java. Path; import java. Rajesh Rajesh 3, 1 1 gold badge 28 28 silver badges 29 29 bronze badges. Felipe Desiderati Felipe Desiderati 1, 1 1 gold badge 14 14 silver badges 35 35 bronze badges.

DownloadFile 'filename. Turns out that if you have a file with spaces in its name, you won't get the entire filename in the response without the double quotes. Good call, fetahokey — Dana. Taras Melon Taras Melon 4 4 silver badges 15 15 bronze badges. Feng Zhang Feng Zhang 1, 10 10 silver badges 18 18 bronze badges. Send back directly InputStreamResource with inputStream.