• MemberSql

  <!-- 아이디에 따른 이름 반환 -->
  	<select id="getNameById" parameterType="String" resultType="String">
  		select name from bootmember where id=#{id}
  	</select>
  	
  	<!-- id와 pass 파라미터로 넘겨서 1 / 0 -->
  	<select id="loginIdPassCheck" parameterType="Map" resultType="int">
  		select count(*) from bootmember where id=#{id} and pass=#{pass}
  	</select>
  	
  	<select id="getDataById" parameterType="String" resultType="MemberDto">
  		select * from bootmember where id=#{id}
  	</select>
  

• MemberMapperInter

  public String getNameById(String id);
  
  	public int loginIdPassCheck(Map<String, String> map);
  
  	public MemberDto getDataById(String id);
  

• MemberServiceInter

  public String getNameById(String id);
  
  	public int loginIdPassCheck(String id, String pass);
  
  	public MemberDto getDataById(String id);
  

• MemberService

  @Override
  	public String getNameById(String id) {
  		return mapper.getNameById(id);
  	}
  
  	@Override
  	public int loginIdPassCheck(String id, String pass) {
  		Map<String, String> map = new HashMap<>();
  		
  		map.put("id", id);
  		map.put("pass", pass);
  		
  		return mapper.loginIdPassCheck(map);
  	}
  
  	@Override
  	public MemberDto getDataById(String id) {
  		return mapper.getDataById(id);
  	}
  

• loginController

  @Controller
  public class LoginController {
  
  	@Autowired
  	MemberService service;
  
  	@GetMapping("/login/main")
  	public String loginform(HttpSession session, Model model) {
  
  		// 폼에 아이디 얻기
  		String loginUser = (String) session.getAttribute("loginUser");
  		// 로그인 상태?
  		String loginOk = (String) session.getAttribute("loginOk");
  
  		// 한번도 실행 x -> null
  		if (loginOk == null)
  			return "/login/loginForm";
  		else {
  			// 로그인 중일 때 request에 로그인 한 이름 저장
  			String name = service.getNameById(loginUser);
  			model.addAttribute("name", name);
  			
  			return "/login/logoutForm";
  		}
  	}
  
  	@PostMapping("/login/loginProcess")
  	public String loginProc(@RequestParam String id, @RequestParam String pass,
  			@RequestParam(required = false) String cbSave, HttpSession session, Model model) {
  
  		int check = service.loginIdPassCheck(id, pass);
  
  		if (check == 1) {
  			session.setMaxInactiveInterval(60 * 60 * 8);
  
  			session.setAttribute("loginUser", id);
  			session.setAttribute("loginOk", "yes");
  			session.setAttribute("saveOk", cbSave);
  
  			// id에 대한 데이터
  			MemberDto dto = service.getDataById(id);
  
  			session.setAttribute("loginPhoto", dto.getPhoto());
  
  			return "redirect:main";
  
  		} else {
  
  			return "/member/passFail";
  		}
  	}
  	
  	
  	@GetMapping("/login/logoutProcess")
  	public String logoutProc(HttpSession session) {
  		session.removeAttribute("loginOk");
  	
  		return "redirect:main";
  	}
  }
  

• loginForm

  <div align="center">
  		<form action="loginProcess" method="post">
  			<table class="table table-bordered" style="width: 400px; height: 200px;">
  				<caption>
  					<b style="font-size: 1.5em">USER LOGIN</b>
  				</caption>
  				<tr>
  					<td style="vertical-align: middle;"><input type="text" name="id" placeholder="Input ID" style="height: 45px"
  						class="form-control" required="required" autofocus="autofocus" value="${sessionScope.saveOk==null?"":sessionScope.loginUser }"></td>
  				</tr>
  				<tr>
  					<td style="vertical-align: middle;"><input type="password" name="pass" placeholder="Input PW"  style="height: 45px"
  						class="form-control" required="required"></td>
  				</tr>
  				<tr>
  					<td><input type="checkbox" name="cbSave" ${sessionScope.saveOk==null?"":"checked" }>&nbsp;save
  						ID&nbsp;&nbsp;
  						<button style="float: right" type="submit" class="btn btn-success">LOGIN</button></td>
  				</tr>
  			</table>
  		</form>
  	</div>
  

null이 requireparam에 넘어올 경우

*@RequestParam*(required = false) String cbSave

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