Spring MVC File Download

Spring MVC File Download

Let's guide you on how to implement a file download functionality in Spring MVC. Here's a step by step tutorial:

  • Create a new Spring MVC project: Create a new Spring MVC project in your preferred IDE. You can create a new Spring Boot project and add Spring Web MVC to the dependencies.

  • Set up your Controller: Create a new Controller class to handle the file download requests. Annotate the class with @Controller. Here's an example of what the file download method could look like:

import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.Resource; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import java.io.IOException; @Controller public class FileDownloadController { @GetMapping("/download") public ResponseEntity<Resource> downloadFile() throws IOException { Resource resource = new ClassPathResource("static/sample.pdf"); HttpHeaders headers = new HttpHeaders(); headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=sample.pdf"); return ResponseEntity.ok() .headers(headers) .contentType(MediaType.parseMediaType("application/pdf")) .body(resource); } }

In the above code, we are using the ClassPathResource to load the file from the classpath (In this case, the file is located in the static directory). The HttpHeaders.CONTENT_DISPOSITION header is set to attachment; filename=sample.pdf to suggest the browser to download the file instead of displaying it.

  • Run the Application and Test the Download Functionality: Start your Spring Boot application and navigate to http://localhost:8080/download in your browser. If everything is set up correctly, the browser should download the sample.pdf file.

Please note that in a real-world application, you should handle potential exceptions (for example, if the file is not found).

You can customize this example to suit your needs. For example, you can add a parameter to the downloadFile method to specify which file to download. Also, depending on where your files are stored, you might need to load them in a different way (for example, from a file system or a database).

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