SSM 框架中 Form表单提交 通过request.getParameter("属性名") 获取的结果为null

<form action="/login" method="post" name="loginForm" id="loginForm">
    <div
        style="width: 382px; height: 376px; padding: 27px 0px; margin: 0px 84px 0px 0px; float: right; vertical-align: top;">
        <div style="clear: both; width: 382px; height: 325px; vertical-align: top;">
            <table width="382" border="0" cellspacing="0" cellpadding="0">
                <tbody>
                    <tr>
                        <td colspan="2"><input type="text" class="yhm" id="name" name="name"
                                placeholder="请输入您的用户名！"></td>
                    </tr>
                    <tr>
                        <td colspan="2" style="padding-top: 18px;"><input type="password" class="mima"
                                id="password" name="password" placeholder="请输入您的密码！"></td>
                    </tr>
                    <tr>
                        <td colspan="2" style="padding-top: 10px;" align="center"><input type="button"
                                onclick="submitForm();return false;"></td>
                    </tr>
                </tbody>
            </table>
        </div>
    </div>
</form>

    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public String login() throws Exception {
        String username = getParameter("name");
        String password = getParameter("assword");
    }　　　


　　　//这个方法是封装方法　

　　　　protected String getParameter(String name) {
　　　　　　return request.getParameter(name);
　　　　}