Spring Boot upload file with ajax example 2016-04-18 23:02

Last blog Spring Boot upload file with form example shows how to upload file with form. As we all know upload file with Ajax can improves user experience. Today I will show you how to upload file with Ajax. Same as last blog we use jsp as page. You can click here to learn how to use jsp in Spring Boot.

Project Structure

│  ├─java
│  │  └─com
│  │      └─henryxi
│  │          └─upload
│  │              └─ajax
│  │                      SampleUploadController.java
│  │
│  └─resources
│      │  application.properties
│      │
│      └─META-INF
│          └─resources
│              │  jquery.1.12.0.js
│              │
│              └─WEB-INF
│                  └─jsp
│                          upload.jsp

The dependencies in pom file and configurations in application.properties are same as Spring Boot upload file with form example. To use ajax upload file you need add jquery in the META_INF/resource folder. Following paths in Spring Boot defined as default resource directories.

  • /META-INF/resources/
  • /resources/
  • /static/
  • /public/

Here we use /META-INF/resources/ as static resource directory.

jsp file

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>upload file</title>
<script type="application/javascript" src="jquery.1.12.0.js"></script>
<input type="file" id="file" name="file">
<input id="uploadBtn" type="button" value="upload">
<div id="content"></div>
<script type="application/javascript">
    $('#uploadBtn').click(function () {
        var formData = new FormData();
        formData.append('file', $('#file')[0].files[0]);

            url: 'upload',
            type: 'POST',
            data: formData,
            processData: false,  // tell jQuery not to process the data
            contentType: false,  // tell jQuery not to set contentType
            success: function (data) {

Run main method and visit http://localhost:8080 then choose file and upload. You can see the name and content of the file. As you can see Ajax is more friendly then form submit.