我想将字符串列表发布到我的控制器。但是它始终仅采用第一个选定的值。

我的百里香html形式：

<form action="/add" method="post">
    <div class="form-group">
        <label for="roleId">ID</label> <input type="text" class="form-control" id="roleId" name="id" required="required" />
    </div>
    <div class="form-group">
        <label for="rolePrivileges">Privileges</label>
        <select class="form-control" id="rolePrivileges" name="privileges" multiple="multiple" size="10" required="required">
            <option th:each="type : ${privilegesList}" th:value="${type}" th:text="${type}">Privilege</option>
        </select>
    </div>
    <button type="submit" class="btn btn-default">Create</button>
</form>

我的控制器：

@RequestMapping(value = "/add", method = RequestMethod.POST)
public String addSomething(Model model, @ModelAttribute("id") String id,
        @ModelAttribute("privileges") List<String> privileges) {
    // add something with a service
    return "redirect:/roles";
}