JAVA/JAVA개발자 양성과정

[SpringMVC] POST/GET가져오기, 로그인 구현, 회원가입 구현, POST 한글 값 깨짐 해결

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👩‍💻 자바 개발자 양성과정 55일차

  1. SpringMVC에서 POST/GET가져오기
  2. 로그인 구현
  3. 회원가입 구현
  4. POST 한글 값 깨짐 해결

 

아침에 엄마가 눈이왔다고 했다 11월에 벌써 눈이라니..

쌓인 눈은 아니여서 바로 사라졌지만 이불속이 너무 아늑하게 느껴져서 오늘은 집에서 온라인 수업을 들었다.

SpringMVC에서 POST/GET가져오기

 

🚩 첫번째, HttpServletRequest를 이용한 방법

package com.example.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.example.vo.UserVO;

@Controller
public class ReuestController {

	// 첫번째, HttpServletRequest를 이용한 방법
	@RequestMapping(value = "/confirm", method = RequestMethod.GET) // /biz/confirm
	public String confirm(HttpServletRequest request, Model model) {
		String userid = request.getParameter("userid");
		String passwd = request.getParameter("passwd");
		String name = request.getParameter("name");
		int age = Integer.parseInt(request.getParameter("age"));
		String gender = request.getParameter("gender");

		model.addAttribute("userid", userid);
		model.addAttribute("passwd", passwd);
		model.addAttribute("name", name);
		model.addAttribute("age", age);
		model.addAttribute("gender", gender);
		return "confirm"; // /WEB-INF/views + /confirm + .jsp
	}

}
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>User Impormation</title>
</head>

<body>
    <h3>HttpServletRequest을 이용한 방법</h3>
    userid : ${username}<br>
    passwd : ${passwd}<br>
    name : ${name}<br>
    age : ${age}<br>
    gender : ${gender}
</body>

</html>

 

🚩 두번째, @RequestParam을 이용한 방법

package com.example.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.example.vo.UserVO;

@Controller
public class ReuestController {

	// 두번째, @RequestParam을 이용한 방법
	@RequestMapping(value = "/confirm1", method = RequestMethod.GET) // /biz/confirm1
	public String confirm1(@RequestParam("userid") String userid, @RequestParam("passwd") String passwd,
			@RequestParam("name") String name, @RequestParam("age") int age, @RequestParam("gender") String gender,
			Model model) {

		model.addAttribute("userid", userid);
		model.addAttribute("passwd", passwd);
		model.addAttribute("name", name);
		model.addAttribute("age", age);
		model.addAttribute("gender", gender);
		return "confirm1"; // /WEB-INF/views + /confirm1 + .jsp
	}

}
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>User Impormation</title>
</head>

<body>
    <h3>@RequestParam을 이용한 방법</h3>
    userid : ${userid}<br>
    passwd : ${passwd}<br>
    name : ${name}<br>
    age : ${age}<br>
    gender : ${gender}
</body>

</html>

 

🚩 세번째, @RequestParam을 이용한 방법 2 - addAttribute에 vo타입을 담아 넘기기

package com.example.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.example.vo.UserVO;

@Controller
public class ReuestController {

	// 세번째,@RequestParam을 이용한 방법 - 2 addAttribute에 vo타입을 담아 넘기기
	@RequestMapping(value = "/confirm2", method = RequestMethod.GET) // /biz/confirm2
	public String confirm2(@RequestParam("userid") String userid, @RequestParam("passwd") String passwd,
			@RequestParam("name") String name, @RequestParam("age") int age, @RequestParam("gender") String gender,
			Model model) {

		UserVO user = new UserVO();
		user.setUserid(userid);
		user.setPasswd(passwd);
		user.setName(name);
		user.setAge(age);
		user.setGender(gender);

		model.addAttribute("userinfo", user);
		return "confirm2"; // /WEB-INF/views + /confirm2 + .jsp
	}

}

 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="user" value="${userinfo}" />
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>User Impormation</title>
</head>

<body>
    <h3>@RequestParam을 이용한 방법 - 2 addAttribute에 vo타입을 담아 넘기기</h3>
    userid : ${userinfo.userid}<br>
    passwd : ${userinfo.passwd}<br>
    name : ${userinfo.name}<br>
    age : ${userinfo.age}<br>
    gender : ${userinfo.gender}
</body>

</html>

 

🚩 네번째, Data Commander 2 - 스프링을 이용하는 방법

 

\src\main\java\com\example\controller\ReuestController.java

package com.example.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.example.vo.UserVO;

@Controller
public class ReuestController {

	// 네번째,스프링을 이용하는 방법
	@RequestMapping(value = "/confirm3", method = RequestMethod.GET) // /biz/confirm3
	public String confirm3(UserVO user) {
		return "confirm3"; // /WEB-INF/views + /confirm3 + .jsp
	}

}

 

\src\main\webapp\WEB-INF\views\confirm3.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="user" value="${userVO}" />
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>User Impormation</title>
</head>

<body>
    <h3>스프링을 이용하는 방법</h3>            
    userid : ${user["userid"]}<br>
    passwd : ${user.passwd}<br>
    name : ${user.name}<br>
    age : ${user.age}<br>
    gender : ${user.gender}
</body>

</html>

 

좌 JSP 우 JAVA파일

 

 

🚩 네번째, @PathVariable 이용한 방법

package com.example.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.example.vo.UserVO;

@Controller
public class ReuestController {

	// 다섯번째, @PathVariable 이용한 방법
	@RequestMapping(value = "/confirm4/{userid}/{passwd}/{name}/{age}/{gender}", method = RequestMethod.GET)
	public String confirm4(@PathVariable String userid, @PathVariable String passwd, @PathVariable String name,
			@PathVariable int age, @PathVariable String gender, Model model) {
		model.addAttribute("userinfo", new UserVO(userid, passwd, name, age, gender));
		return "confirm4"; // /WEB-INF/views + /confirm4 + .jsp
	}
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="user" value="${userinfo}" />
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>User Impormation</title>
</head>

<body>
    <h3>@PathVariable 이용한 방법</h3>            
    userid : ${user["userid"]}<br>
    passwd : ${user.passwd}<br>
    name : ${user.name}<br>
    age : ${user.age}<br>
    gender : ${user.gender}
</body>

</html>

 

🚩 로그인 구현

 

\src\main\java\com\example\biz\HomeController.java

package com.example.biz;

import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
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 com.example.vo.UserVO;

import lombok.extern.java.Log;

/**
 * Handles requests for the application home page.
 */
@Controller
@Log
public class HomeController {

	private static final Logger logger = LoggerFactory.getLogger(HomeController.class);

	@RequestMapping(value = "/login", method = RequestMethod.POST)
	public String login(@RequestParam("userid") String userid, @RequestParam("passwd") String passwd, Model model) {
		log.info("post방식");
		model.addAttribute("userid", userid);
		model.addAttribute("passwd", passwd);
		return "login"; // /WEB-INF/views + /login + .jsp
	}

	@RequestMapping(value = "/login", method = RequestMethod.GET)
	public ModelAndView login(@RequestParam("userid") String userid, @RequestParam("passwd") String passwd) {
		log.info("get방식");
		ModelAndView mav = new ModelAndView();
		mav.addObject("userid", userid);
		mav.addObject("passwd", passwd);
		mav.setViewName("login");
		return mav;
	}

}

 

\src\main\webapp\resources\login.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>로그인 폼</title> 
</head>

<body>
    <form method="POST" action="/biz/login">
        아이디 : <input type="text" name="userid" /><br />
        패스워드 : <input type="password" name="passwd" /><br />
        <input type="submit" value="로그인하기" /> 
    </form>
</body>

</html>

 

\src\main\webapp\WEB-INF\views\login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
</head>

<body>
    아이디 : ${userid} <br />
    패스워드 : ${passwd}
</body>

</html>

 

🚩 회원가입 구현 + POST 한글 값 깨짐 해결방법

package com.example.biz;

import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
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 com.example.vo.UserVO;

import lombok.extern.java.Log;

/**
 * Handles requests for the application home page.
 */
@Controller
@Log
public class HomeController {

	private static final Logger logger = LoggerFactory.getLogger(HomeController.class);
	
	@RequestMapping(value = "/register", method = RequestMethod.POST)
	public String register(UserVO user) {
		log.info(user.toString());
		return "register"; // /WEB-INF/views + /register + .jsp
	}

}

위에서 파라미터를 UserVO user로 사용할 수 있었던 건

POST로 받아오는 name들이 UserVO내 요소들과 이름이 같기 때문이다.

 

만약 달랐다면 어떻게 되는지 보여준다.
UserVO
package com.example.vo;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString
@NoArgsConstructor
@AllArgsConstructor
public class UserVO {
  private String userid;
  private String passwd;
  private String name;
  private int age;
  private String gender;
}		 register.html
<form method="POST" action="/biz/register">
        아이디 : <input type="text" name="userid1" /><br />
        패스워드 : <input type="password" name="passwd1" /><br />
        이름 : <input type="text" name="name" /><br />
        나이 : <input type="number" name="age" /><br />
        성별 : 남성  <input type="radio" name="gender" value="남성" /> &nbsp;&nbsp;
        여성 <input type="radio" name="gender" value="여성" /> <br />  
        <input type="submit" value="가입하기" /> 
  </form>



form내 name과 vo요소에 이름이 같은 건 정상적으로 받아오지만, 다른 userid와 passwd는 받아오지 못하는 모습이다.

 

 

\src\main\webapp\resources\register.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>회원가입 폼</title> 
</head>

<body>
    <form method="POST" action="/biz/register">
        아이디 : <input type="text" name="userid" /><br />
        패스워드 : <input type="password" name="passwd" /><br />
        이름 : <input type="text" name="name" /><br />
        나이 : <input type="number" name="age" /><br />
        성별 : 남성  <input type="radio" name="gender" value="남성" /> &nbsp;&nbsp;
        여성 <input type="radio" name="gender" value="여성" /> <br />  
        <input type="submit" value="가입하기" /> 
    </form>
</body>

</html>

 

GET에서는 한글이 깨지지 않는데, POST상태에서 가입을 진행해보면 log에 한글이 깨지는 걸 확인할 수 있다.

POST상태에서 받아온 값이 한글일 경우 깨짐

 

그래서 web.xml에 필터를 추가해어야 한다.

<filter>
		<filter-name>encodingFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter
		</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

이거 추가해주고 다시 확인해보자.

 

한글이 잘 나오는 걸 볼수있다.

🚩 Spring Redirect - 회원 구분에 따라 Redirect하기

@RequestMapping(value = "/verify", method = RequestMethod.GET) // /biz/verify?userid=admin
	public String verify(@RequestParam("userid") String userid, Model model) {
		if (userid.equals("admin")) {
			return "redirect:admin";// /biz/admin
		}
		return "redirect:user"; // /biz/user
		// return "redirect:http://www.naver.com"; //절대 경로도 가능
	}
	
	// /biz/admin 일때 실행
	@RequestMapping(value = "/admin", method = RequestMethod.GET) 
	public void admin() {
		log.info("관리자 안녕!");
	}
	
	// /biz/user 일때 실행
	@RequestMapping(value = "/user", method = RequestMethod.GET)
	public void user() {
		log.info("회원 안녕!");
	}

http://localhost:8080/biz/verify?userid=admin 로 접속을 하면

/biz/admin 로 이동한다. redirect답게 주소가 바뀌는걸 확인 할 수 있다.

 

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