[SpringBoot2.4.3] フォームコントロール

	<form method="post" action="/">
		<div>
			<input type="checkbox" id="check1" name="check1">
			<label for="check1">チェック</label>
		</div>
		<div>
			<input type="radio" id="radioA" name="radio1" value="male">
			<label for="radioA">男性</label>
		</div>
		<div>
			<input type="radio" id="radioB" name="radio1" value="femail">
			<label for="radioB">女性</label>
		</div>
		<div>
			<select id="select1" name="select1" size="4">
				<option value="Windows">Windows</option>
				<option value="Mac">Mac</option>
				<option value="Linux">Linux</option>
			</select>
		</div>
		<div>
			<select id="select2" name="select2" size="4" multiple="multiple">
				<option value="Android">Android</option>
				<option value="iphone">iPhone</option>
				<option value="Winfone">Windows Phone</option>
			</select>
		</div>
		<input type="submit" value="Click">
	</form>

Controller

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController {
	
	@RequestMapping(value="/", method=RequestMethod.GET)
	public ModelAndView index(ModelAndView mav) {
		mav.setViewName("index");
		mav.addObject("msg", "フォームを送信してください。");
		return mav;
	}
	
	@RequestMapping(value="/", method=RequestMethod.POST)
	public ModelAndView send(
			@RequestParam(value="check1",required=false) boolean check1,
			@RequestParam(value="radio1",required=false) String radio1,
			@RequestParam(value="select1",required=false) String select1,
			@RequestParam(value="select2",required=false) String[] select2,
			ModelAndView mav) {
		
		String res = "";
		try {
			res = "check:" + check1 + " radio:" + radio1 + " select:" + select1 + "\nselect2:";
		} catch(NullPointerException e) {}
		try {
			res += select2[0];
			for(int i = 1; i < select2.length; i++) 
				res += ", " + select2[i];
			} catch (NullPointerException e) {
				res += "null";
			}
		mav.addObject("msg", res);
		mav.setViewName("index");
		return mav;
	}
}

そこそこ来てる？　学習途中はどこら辺にいるかさっぱり見当がつかないなー