[Web] MVC

soyeon·2022년 7월 26일

web 카카오클라우드스쿨

Web_카카오클라우드

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MVC (Model View Controller)

: software system을 3가지 type의 component로 분할하는 소프트웨어 패턴이다.

MVC를 포함한 도식

MVC를 이용해 login과 도서검색 구현

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<div>로그인하세요!</div><br><br>
	<form action="/book/login" method="POST">
		ID : <input type="text" name="userID"><br><br>
		PW : <input type="password" name="userPW"><br><br>
		<input type="submit" value="로그인">
	</form>
</body>
</html>

member/loginFail.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	로그인에 실패했습니다!
</body>
</html>

member/loginSuccess.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"
    import="member.vo.Member"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<% Member member = (Member) request.getAttribute("member"); %>
	<%= member.getName() %>님 환영합니다.
</body>
</html>

java/member/vo/Member.java

package member.vo;

public class Member {
	
	private String id;
	private String pw;
	private String name;
	
	public Member() {
		
	}
	
	public Member(String id, String pw, String name) {
		super();
		this.id = id;
		this.pw = pw;
		this.name = name;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getPw() {
		return pw;
	}

	public void setPw(String pw) {
		this.pw = pw;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

java/memver/dao/MemberDAO.java

package member.dao;

import member.vo.Member;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;

public class MemberDAO {
	
	private DataSource ds;
	
	public MemberDAO() throws Exception  {
		Context init = new InitialContext();
		ds = (DataSource)init.lookup("java:comp/env/jdbc/MySQLDB");
	}
	
	public Member select(Member member) throws Exception {
		Connection con = ds.getConnection();
		System.out.println("connection 획득 성공!");
		
		String sql = "SELECT * FROM members WHERE id = ? AND pw = ?";
		PreparedStatement pstmt = con.prepareStatement(sql);
		pstmt.setString(1, member.getId());
		pstmt.setString(2, member.getPw());
		
		ResultSet rs = pstmt.executeQuery();
		if(rs.next()) {
			// 로그인이 된다는 의미
			member.setName(rs.getString("name"));
			return member;
		}
		return null;
	}
}

java/member/service/MemberService.java

package member.service;

import member.dao.MemberDAO;
import member.vo.Member;

public class MemberService {
	
	// login 처리하는 business method
	public Member login(Member member) {
		
		// 로그인이 되는지 확인하는 로직 처리
		// Database 처리
		// Database 처리를 위해 DAO가 있어야 한다.(class도 존재해야 한다.)
		try {
			MemberDAO dao = new MemberDAO();
			member = dao.select(member);	
		} catch (Exception e) {
			System.out.println(e);
		}
		
		return member;
	}
}

java/member/controller/LoginController.java

package member.controller;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import member.service.MemberService;
import member.vo.Member;

/**
 * Servlet implementation class LoginController
 */
@WebServlet("/login")
public class LoginController extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginController() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// 1. 입력받고
		String id = request.getParameter("userID");
		String pw = request.getParameter("userPW");
		
		// 2. 로직 처리
		// 	  로직 처리 하기 위해서 service 객체를 생성(service class가 필요)
		//	  클라이언트에서 입력 받은 데이터를 service에 전달하기 위해 VO가 필요하다
		// 	  VO를 만들기 위해 class가 있어야 한다.
		Member member = new Member();
		member.setId(id);
		member.setPw(pw);
		
		MemberService service = new MemberService();
		member = service.login(member);
		
		// 3. 출력
		// 	  로그인에 성공하면 member vo 객체 안에 로그인한 사람의 이름이 들어가 있다.
		if(member != null) {
			// 로그인에 성공하면 JSP를 이용해서 출력해야 한다.
			// member vo 객체를 JSP에게 전달해야 한다.
			// 즉, controller servlet이 request를 전달해서 다른 서블릿(JSP)을 호출
			RequestDispatcher rd = request.getRequestDispatcher("/member/loginSuccess.jsp");
			request.setAttribute("member", member);
			rd.forward(request, response);
		} else {
			response.sendRedirect("/book/member/loginFail.html");
		}
	}

}

soyeon

이전 포스트

[Web] JSP

다음 포스트

[Web] MVC

Web_카카오클라우드

MVC (Model View Controller)

MVC를 포함한 도식

MVC를 이용해 login과 도서검색 구현

로그인

[Web] JSP

[Web] jQuery

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