模型层需要提供数据选项,设置错误信息
关键代码
@NotEmpty(message = "请选择兴趣爱好") private String[] hobbies;
控制器层需要在显示视图前，通过model传递数据选项到视图层
数据代码
final static Map<String,String>SELECT_HOBBIES =Collections.unmodifiableMap(new LinkedHashMap<String,String>(){
private static final long serialVersionUID = 1L;
{
put("打球","打球");
put("听歌","听歌");
put("玩游戏","玩游戏");
put("写代码","写代码");
put("吃烧烤","吃烧烤");
}
});
关键代码
@GetMapping("/adduser")
public String showAddUserForm(Model model) {
User user = new User();
user.setId(userDao.getMaxId());
model.addAttribute("user", user);
model.addAttribute("selectItems", SELECT_HOMETOWN);//通过此行设置信息到视图层
return "add-user";
}
视图层循环显示
关键代码
<select th:field="*{hobbies}" multiple="multiple" size="3" class="form-control">
<option th:each="item : ${multipleItems}" th:value="${item.value}" th:text="${item.key}" />
</select>
详情列表显示代码
<td><p th:each="h:*{user.hobbies}" th:text="${h}"></p></td>
原文：https://www.cnblogs.com/max-hou/p/11111329.html