[JAVA] File upload with Spring Boot

Implement as the title of the article. The following functions will be implemented this time. -Upload by specifying the image path from the input screen composed of HTML form and input tag -Output the file to the specified directory via Java

File to modify

Modify the following 3 files 1.png



@RequestMapping(path = "/sample/upload", method = RequestMethod.GET)
String uploadview(Model model) {
  return "sample/upload";

@RequestMapping(path = "/sample/upload", method = RequestMethod.POST)
String upload(Model model, UploadForm uploadForm) {
  if (uploadForm.getFile().isEmpty()) {
    return "sample/upload";

  // check upload distination directory.If there was no directory, make
  // func.
  Path path = Paths.get("/Users/demo-kusa/image");
  if (!Files.exists(path)) {
    try {
    } catch (NoSuchFileException ex) {
    } catch (IOException ex) {

  int dot = uploadForm.getFile().getOriginalFilename().lastIndexOf(".");
  String extention = "";
  if (dot > 0) {
    extention = uploadForm.getFile().getOriginalFilename().substring(dot).toLowerCase();
  String filename = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS").format(LocalDateTime.now());
  Path uploadfile = Paths
      .get("/Users/demo-kusa/image/" + filename + extention);

  try (OutputStream os = Files.newOutputStream(uploadfile, StandardOpenOption.CREATE)) {
    byte[] bytes = uploadForm.getFile().getBytes();
  } catch (IOException ex) {

  return "redirect:/sample";



package com.example;

import org.springframework.web.multipart.MultipartFile;
public class UploadForm {
  private MultipartFile file;

  public MultipartFile getFile() {
    return file;

  public void setFile(MultipartFile file) {
    this.file = file;



<html xmlns:th="http://www.thymeleaf.org">
<title>top page</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<h2>Image upload</h2>
    <form method="post" enctype="multipart/form-data" action="/sample/upload" >
        <input name="file" type="file" />
        <input type="submit" value="Send"/>

This article has partially replaced the environment-dependent part, but the source is below, so if you need it, please. github kaikusakari/spring_crud

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