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个人测试的表单验证的返回，使用errorMap存放错误信息

<form class="form-signin" action="/login" method="POST">
    <!--<p th:each="attr : ${#request.getAttributeNames()}"-->
           <!--th:text="${attr} +':'+${#request.getAttribute(attr)}"> 如果你想知道request中有什么属性</p>-->
    <p th:text="${#request.getAttribute('errorMap')}"> errorMap中有什么属性</p>

    <input type="text" name="username" class="form-control" placeholder="用户名" autofocus
        th:class="'field-error form-control'" th:value="${usernameInput}">
            <label class="error-label" th:if="${errorMap}" th:text="${errorMap['username']}"></label>

       <input type="password" name="password" class="form-control" placeholder="密码"
        th:class="'field-error form-control'" th:value="${passwordInput}">
    <label class="error-label" th:if="${errorMap}" th:text="${errorMap['password']}"></label>

    <input type="text" name="validateCode" class="form-control" placeholder="验证码" th:class="'field-error'" >
    <img src="/validateCode">
    <label class="error-label" th:if="${errorMap}" th:text="${errorMap['validateCodeError']}"></label>

    <button class="btn btn-lg btn-login btn-block" type="submit">
                <i class="fa fa-check"></i>
    </button>
</form>

示例结果：