How To Upload Files In Java Using Spring Boot Nginx

import java.io.IOException;     // to handle exception
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.springframework.web.multipart.MultipartFile;     // to handle upload file
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

//controller handeling 
    @PostMapping(value = "/icon")
    public String handleFileUpload(@RequestParam("file") MultipartFile file,
                                   RedirectAttributes redirectAttributes) {
        String fileName = addIconInActivityType(file);
        redirectAttributes.addFlashAttribute("message",
                "You successfully uploaded " + fileName + "!");
        return "redirect:/";
    }

    public  String addIconInActivityType(MultipartFile file) throws IOException {
        byte[] bytes = file.getBytes();
        String modifiedFileName = System.currentTimeMillis() + file.getOriginalFilename().substring(file.getOriginalFilename().length() - 4);
        Path path = Paths.get("/opt/images/" + modifiedFileName);
        Files.write(path, bytes);

        return modifiedFileName;

    }
  

location /images{
	alias "/opt/images";
}
  

 sudo service nginx restart
  

 sudo service nginx status