[쉽게 배우는 JSP 웹 프로그래밍] 18장 정리

MVC 패턴 구현 방법

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
	<security-role>
		<role-name>admin</role-name>
	</security-role>
	<security-constraint>
		<web-resource-collection>
			<web-resource-name>JSPBook</web-resource-name>
			<url-pattern>/ch10/practice/practice04.jsp</url-pattern>
			<http-method>GET</http-method>
		</web-resource-collection>
		<auth-constraint>
			<description></description>
			<role-name>admin</role-name>
		</auth-constraint>
	</security-constraint>
	<login-config>
		<auth-method>FORM</auth-method>
		<form-login-config>
			<form-login-page>/ch10/practice/practice04_login.jsp
			</form-login-page>
			<form-error-page>/ch10/practice/practice04_login_failed.jsp
			</form-error-page>
		</form-login-config>
	</login-config>
	<!-- <error-page> <error-code>500</error-code> <location>/ch11/errorCode_error.jsp</location> 
		</error-page> <error-page> <exception-type>javax.servlet.ServletException</exception-type> 
		<location>/ch11/practice/practice05_error.jsp</location> </error-page> -->
	<filter>
		<filter-name>Filter01</filter-name>
		<filter-class>ch12.AuthenFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>Filter01</filter-name>
		<url-pattern>/ch12/filter01.process.jsp</url-pattern>
	</filter-mapping>
	<filter>
		<filter-name>Filter02</filter-name>
		<filter-class>ch12.InitParamFilter</filter-class>
		<init-param>
			<param-name>param1</param-name>
			<param-value>admin</param-value>
		</init-param>
		<init-param>
			<param-name>param2</param-name>
			<param-value>1234</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>Filter02</filter-name>
		<url-pattern>/ch12/filter02_process.jsp</url-pattern>
	</filter-mapping>
	<filter>
		<filter-name>Filter02_2</filter-name>
		<filter-class>ch12.LogFileFilter</filter-class>
		<init-param>
			<param-name>filename</param-name>
			<param-value>c:\\logs\\monitor.log</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>Filter02_2</filter-name>
		<url-pattern>/ch12/filter02_process.jsp</url-pattern>
	</filter-mapping>
	<filter>
		<filter-name>loginFilter</filter-name>
		<filter-class>ch12.practice.LoginCheckFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>loginFilter</filter-name>
		<url-pattern>/ch12/practice/practice04_success.jsp</url-pattern>
	</filter-mapping>
	<servlet>
		<servlet-name>myController</servlet-name>
		<servlet-class>ch18.ControllerServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>myController</servlet-name>
		<url-pattern>/ch18/ControllerServlet</url-pattern>
	</servlet-mapping>
</web-app>

LoginBean.java

package ch18;

public class LoginBean {
	private String id;
	private String password;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public boolean validate() {
		if(password.equals("admin"))
			return true;
		else
			return false;
	}
}

ControllerServlet.java

package ch18;

import java.io.IOException;

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

public class ControllerServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setContentType("text/html; charset=utf-8");

		String id = req.getParameter("id");
		String password = req.getParameter("passwd");

		LoginBean bean = new LoginBean();
		bean.setId(id);
		bean.setPassword(password);
		req.setAttribute("bean", bean);

		boolean status = bean.validate();

		if (status) {
			RequestDispatcher rd = req.getRequestDispatcher("mvc_success.jsp");
			rd.forward(req, resp);
		} else {
			RequestDispatcher rd = req.getRequestDispatcher("mvc_error.jsp");
			rd.forward(req, resp);
		}
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

}

mvc.jsp

<%@ page contentType="text/html; charset=utf-8"%>
<html>
<head>
<title>MVC</title>
</head>
<body>
	<form method="post" action="ControllerServlet">
		<p> 아이디 : <input type="text" name="id">
		<p> 비밀번호 : <input type="text" name="passwd">
		<p><input type="submit" value="전송">
	</form>
</body>
</html>

mvc_success.jsp

<%@ page contentType="text/html; charset=utf-8"%>
<%@ page import="ch18.LoginBean"%>
<html>
<head>
<title>MVC</title>
</head>
<body>
	<p>로그인 성공했습니다
	<p>
		<%
		LoginBean bean = (LoginBean) request.getAttribute("bean");
		out.print("아이디: " + bean.getId());
		%>
	
</body>
</html>

mvc_error.jsp

<%@ page contentType="text/html; charset=utf-8"%>
<html>
<head>
<title>MVC</title>
</head>
<body>
	<p>
		아이디와 비밀번호를 확인해주세요
		<%@include file="mvc.jsp"%>
</body>
</html>

핵심 키워드

• 웹 MVC에서는 클라이언트로부터 컨트롤러인 서블릿을 통해 요청을 받아야 한다. 이흘 위해 web.xml에 서블릿 클래스와 웹 브라우저의 요청 url 패턴을 등록해야 한다.

• 컨트롤러는 뷰와 모델 간의 인터페이스 역할을 하여 웹 브아우저의 모든 요청 URL을 받아들이고 요청 URL과 함께 전달되는 요청 파라미터를 받아 처리하는 서블릿 클래스다.

• 모델은 웹 애플리케이션의 비즈니스 로직을 포함하는 데이터로 웹 애플리케이션의 상태를 나타낸다.

결론