Use the radio buttons Spring

 Model layer needs to provide data options, set error message

Key Code

	@NotNull (message = "Please select gender") 
	Private String Gender;

　　Controller layer needs to view before displaying, by the data model is transmitted to the view option layer

Data code

	final static Map<String,String>RADIO_GENDER = Collections.unmodifiableMap(new LinkedHashMap<String,String>(){
		private static final long serialVersionUID = 1L;
		{
			put("男,","男");
			put("女","女");
		}
	});

　　

Key Code

	@GetMapping ( "/ the adduser") 
	public String showAddUserForm (the Model Model) { 
		the User User new new = the User (); 
		user.setId (userDao.getMaxId ()); 
		model.addAttribute ( "User", User); 
		model.addAttribute ( "radioItems", RADIO_GENDER); // this line setting data to the view layer by 
		return "the Add-User"; 
	}

　　Loop display view layer

Key Code

	<div th:each="item : ${radioItems}">
		 <input type="radio" th:value="${item.value}" th:field="*{gender}" />
		 <i	th:for="${#ids.prev('gender')}" th:text="${item.key}"></i>
	 </div>

　　Detail list shows the code

<td th:text="${user.gender}"></td>