springboot 表单校验

@Entity
public class User implements Serializable {

/**
* 编号
*/
@Id
@GeneratedValue
private Long id;

/**
* 名称
*/
@NotEmpty(message = "姓名不能为空")
@Size(min = 2, max = 8, message = "姓名长度必须大于 2 且小于 20 字")
private String name;

/**
* 年龄
*/
@NotNull(message = "年龄不能为空")
@Min(value = 0, message = "年龄大于 0")
@Max(value = 300, message = "年龄不大于 300")
private Integer age;

/**
* 出生时间
*/
@NotEmpty(message = "出生时间不能为空")
private String birthday;

　　....//省略

}

<form th:action="@{/users/{action}(action=${action})}" method="post" class="form-horizontal">

<input type="hidden" name="id" th:value="${user.id}"/>

<div class="form-group">
<label for="user_name" class="col-sm-2 control-label">名称:</label>
<div class="col-xs-4">
<input type="text" class="form-control" id="user_name" name="name" th:value="${user.name}" th:field="*{user.name}" />
</div>
<label class="col-sm-2 control-label text-danger" th:if="${#fields.hasErrors('user.name')}" th:errors="*{user.name}">姓名有误!</label>
</div>

<div class="form-group">
<label for="user_age" class="col-sm-2 control-label">年龄:</label>
<div class="col-xs-4">
<input type="text" class="form-control" id="user_age" name="age" th:value="${user.age}" th:field="*{user.age}" />
</div>
<label class="col-sm-2 control-label text-danger" th:if="${#fields.hasErrors('user.age')}" th:errors="*{user.age}">年龄有误!</label>
</div>

<div class="form-group">
<label for="user_birthday" class="col-sm-2 control-label">出生日期:</label>
<div class="col-xs-4">
<input type="date" class="form-control" id="user_birthday" name="birthday" th:value="${user.birthday}" th:field="*{user.birthday}"/>
</div>
<label class="col-sm-2 control-label text-danger" th:if="${#fields.hasErrors('user.birthday')}" th:errors="*{user.birthday}">生日有误!</label>
</div>

<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<input class="btn btn-primary" type="submit" value="提交"/>  
<input class="btn" type="button" value="返回" onclick="history.back()"/>
</div>
</div>
</form>

@RequestMapping(value = "/create", method = RequestMethod.POST)
public String postUser(ModelMap map,
@ModelAttribute @Valid User user,
BindingResult bindingResult) {

if (bindingResult.hasErrors()) {
map.addAttribute("action", "create");
return "userForm";
}

userService.insertByUser(user);

return "redirect:/users/";
}