springboot（2.4.0）实现文件上传

前端表单

<form role="form" th:action="@{/upload}" method="post" enctype="multipart/form-data">
                            <div class="form-group">
                                <label for="exampleInputEmail1">邮箱</label>
                                <input type="email" name="email" class="form-control" id="exampleInputEmail1" placeholder="Enter email">
                            </div>
                            <div class="form-group">
                                <label for="exampleInputPassword1">名字</label>
                                <input type="text" name="username" class="form-control" id="exampleInputPassword1" placeholder="Password">
                            </div>
                            <div class="form-group">
                                <label for="exampleInputFile">头像</label>
                                <input type="file" name="headerImg" id="exampleInputFile">
                                <p class="help-block">Example block-level help text here.</p>
                            </div>
                            <div class="form-group">
                                <label for="exampleInputFile">生活照</label>
                                <input type="file" name="photos" multiple>
                                <p class="help-block">Example block-level help text here.</p>
                            </div>
                            <div class="checkbox">
                                <label>
                                    <input type="checkbox"> Check me out
                                </label>
                            </div>
                            <button type="submit" class="btn btn-primary">提交</button>
                        </form>

后端实现

上传过程中可能会报错，就是超出了文件大小的错误，可以通过添加配置解决