웹/spring

[spring] - request parameter 전달 받는 방법 4가지! 예제 /Cotroller의 파라미터 수집

은은하게미친자 2022. 8. 8. 23:52
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Cotroller의 파라미터 수집

: Cotroller를작성할 때 가장 편리한 기능은 파라미터가 자동으로 수집되는 기능입니다!

이기능을 이용하면 매번 request.getParameter()를 이용하는 불편함을 줄일 수있습니다.

 

request의 파라미터를 전달 받는 방법 4가지

종류 예제
HttpServletRequest   req.getParameter("userId");
@RequestParam  @RequestParam("userId") String userId
Map<String, Object> map  @RequestParam Map<string,string> info</string,string>
BeanClass @ModelAttribute("info") UserVO uservo

 

+ 세션 주고받기 예제

 

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package kr.co.dong;
 
import java.io.UnsupportedEncodingException;
import java.util.Map;
 
import javax.servlet.http.HttpServletRequest;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
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 LoginController {
    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);
    
    @RequestMapping(value = "login/loginForm", method = RequestMethod.GET)
    public ModelAndView loginForm() {
        logger.info("로그인폼입니다.");
        System.out.println("==========================================================");
        ModelAndView mav = new ModelAndView();
        
        mav.addObject("test", "test Model");
        mav.setViewName("login/loginForm");
        return mav;
    }
    
    //1. request 파라미터 전달 받는 방법 : HttpServletRequest
    @RequestMapping(value = "login/login", method = RequestMethod.POST)
    public ModelAndView loginResult(HttpServletRequest req) throws Exception {
        req.setCharacterEncoding("utf-8");
        logger.info("로그인확인폼1입니다.");
        System.out.println("==========================================================");
        
        ModelAndView mav = new ModelAndView();
        
        String u_id = req.getParameter("userId");
        String u_name = req.getParameter("userName");
        
        mav.addObject("userId", u_id);
        mav.addObject("userName", u_name);
        //db호출 여기서하면댐
        
        mav.setViewName("login/result");
        return mav;
        
    }
    
    //2. request 파라미터 전달 받는 방법 : @RequestParam 로 처리하는법
    @RequestMapping(value = "login/login2", method = RequestMethod.POST)
    public ModelAndView loginResult2(@RequestParam("userId") String userId,
                                    @RequestParam("userName") String userName,
                                     HttpServletRequest req) throws Exception {
        req.setCharacterEncoding("utf-8");
        
        logger.info("로그인확인폼2입니다.");
        System.out.println("==========================================================");
 
        ModelAndView mav = new ModelAndView();
        
        mav.addObject("userId", userId);
        mav.addObject("userName", userName);
        //db호출 여기서하면댐
        
        mav.setViewName("login/result");
        return mav;
        
    }
    
    //3. request 파라미터 전달 받는법 : Map<String, Object> map
    @RequestMapping(value = "login/login3", method = RequestMethod.POST)
    public ModelAndView loginResult3(@RequestParam Map<String,String> info) {
        
        logger.info("로그인확인폼3333입니다.");
        System.out.println("==========================================================");
        
        ModelAndView mav = new ModelAndView();
        
        mav.addObject("info", info);
        //db호출 여기서하면댐
        
        mav.setViewName("login/result");
        return mav;
    }
    
    //4. request 파라미터 전달 받는법 : BeanClass
    
    @RequestMapping(value = "login/login4" , method = RequestMethod.POST)
    public ModelAndView loginResult4(@ModelAttribute("info") UserVO uservo) {
//        public ModelAndView loginResult4(UserVO uservo) {  //위와같음.
        logger.info("로그인확인폼4입니다.");
        System.out.println("==========================================================");
        ModelAndView mav = new ModelAndView();
        
//        mav.addObject("info", uservo);  //써도되고 필요없음
        mav.setViewName("login/result");
        return mav;
    }
        
 
}
 
 cs

name을 꼭 설정할것

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>   
<c:set var="contextPath" value="${pageContext.request.contextPath }" /> 
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>로그인폼</title>
</head>
<body>
    <h1>로그인 폼 </h1>
    ${test}
    <form action="${contextPath}/login/login4" method="post">
        아이디 : <input type="text" name="userId"><br>        
        이름 : <input type="text" name="userName"><br>        
        <input type="submit" value="보내기">    
    </form>
</body>
</html>
 cs

 

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>   
<%
    request.setCharacterEncoding("utf-8");
%> 
 
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>로그인결과창</title>
</head>
<body>
    <h1>로그인 확인</h1>
    아이디 : ${userId} <br>
    이름 : ${userName}<br>
    <hr>
    아이디 : ${info.userId} <br>
    이름 : ${info.userName}<br>
    <hr>
 
</body>
</html>
 cs

 

 

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package kr.co.dong.board;
 
import java.util.Map;
 
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
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;
 
import kr.co.dong.emp.EmpVO;
 
@Controller
public class BoardCotroller {
    @Inject
    BoardService service;
    
    //로그인 폼으로 매핑 board/login-> login(.jsp)
    @RequestMapping(value = "board/login", method = RequestMethod.GET)
    public String login() {
        
        return "login";
    }
    //로그인 처리하기 (DAO) : 성공하면 / 또는 HOME.JSP, 세션 부여함.
    @RequestMapping(value = "board/login", method = RequestMethod.POST)
    public String login(@RequestParam Map<String, Object> map
            , HttpServletRequest req
            , HttpServletResponse res
            , HttpSession session) throws Exception {
 
        req.setCharacterEncoding("utf-8");
        //서비스호출
        System.out.println(map);
        
        Map user = service.login(map);
        
        if (user == null) {
            //로그인실패
            return "redirect:login"; // board/login 이라고 쓰면 board/board/login 됨
        } else {
            //로그인성공
            session.setAttribute("user", user);
            return "redirect:/";
        }
    }
 
}
 
 cs

 

 

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