无法向后端提交表单

Question

我想提交一个包含上传文件字段的表单。当我点击提交按钮时没有任何反应。

我阅读了以下文章，但无法解决问题。 1，2

我的前端和后端代码如下。

     CharSequence error = ((TextInputLayout) view).getError();

配置文件

<form:form action="${url}profile/edit" method="post"
                                modelAttribute="profile" role="form"
                                enctype="multipart/form-data">

                                <div class="form-group">
                                    <label for="photo">Photo</label> <input type="file"
                                        name="photo" class="form-control" id="photo">
                                </div>
                                <div class="form-group">
                                    <label for="title">Title</label>
                                    <div class="dropdown dropdown-form">
                                        <a class="shape-arrow" href="#" data-toggle="dropdown"><span></span></a>
                                        <input type="text" name="title" id="title"
                                            class="form-control" data-toggle="dropdown"
                                            autocomplete="off">
                                        <ul class="dropdown-menu" role="menu" aria-labelledby="title">
                                            <li><a href="#" rel="nofollow">Male</a></li>
                                            <li><a href="#" rel="nofollow">Female</a></li>
                                        </ul>
                                    </div>
                                </div>
                                <div class="form-group">
                                    <label for="firstName">First Name</label> <input type="text"
                                        name="firstName" class="form-control" id="firstName">
                                </div>
                                <div class="form-group">
                                    <label for="lastName">Last Name</label> <input type="text"
                                        name="lastName" class="form-control" id="lastName">
                                </div>
                                <div class="form-group">
                                    <label for="email" class="control-label">Email</label>
                                    <div class="input-group">
                                        <span class="input-group-addon">@</span> <input type="email"
                                            id="email" name="email" class="form-control"
                                            placeholder="Enter email">
                                    </div>
                                </div>
                                <div class="text-center">
                                    <button class="btn btn-action btn-save">Save</button>
                                </div>
                            </form:form>

RequestHandler

public class Profile {
    private MultipartFile photo;
    private String title;
    private String firstName;
    private String lastName;
    private String email;

    getters and setters

}

我添加了＆＃39; Type＆＃39;归因于＆＃39;按钮＆＃39;但是还不能提交表格。

@Controller
@RequestMapping("/profile")
public class ProfileController {    

    @RequestMapping(value = "/edit", method = RequestMethod.POST)
    public String editProfile(
            @ModelAttribute("profile") Profile profile, Model model) {
        System.err.println("in profile/edit" + profile);
        return "profile";
    }

}

另外，我更改按钮输入无效。

 <button class="btn btn-action btn-save" type="submit">Save</button>