Spring Boot Download(Stream) file example

  Here is a example code to download file using spring boot.

package com.shorterpost.springexample.controller;

import org.springframework.core.io.FileSystemResource;
import org.springframework.http.ContentDisposition;
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 org.springframework.web.bind.annotation.RequestParam;

import java.io.File;

@Controller
public class DownloadController {

    @GetMapping("/download")
    public ResponseEntity download(@RequestParam String path)
    {
        File file = new File(path);
        final FileSystemResource resource = new FileSystemResource(file);

        return ResponseEntity
                .ok()
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .contentLength(file.length())
                .header(HttpHeaders.CONTENT_DISPOSITION,"attachment; filename="+file.getName())
                .body(resource);

    }

}