도도의 초록누리

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

    pageEncoding="UTF-8"%>

<jsp:forward page="index.do" />

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns="http://java.sun.com/xml/ns/javaee" 

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 

id="WebApp_ID" version="3.0">

  <display-name>Archetype Created Web Application</display-name>

  <welcome-file-list>

  <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  <servlet>

  <servlet-name>FrontController</servlet-name>

  <servlet-class>com.example.web.controller.FrontController</servlet-class>

  <init-param>

<param-name>charset</param-name>

<param-value>UTF-8</param-value>

</init-param>

  </servlet>

  <servlet-mapping>

  <servlet-name>FrontController</servlet-name>

  <url-pattern>*.do</url-pattern>

  </servlet-mapping>

</web-app>

package com.example.web.util;

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 HttpUtil extends HttpServlet {

private static final long serialVersionUID = 1L;

private static String charset = null;

public static void forward(HttpServletRequest req, HttpServletResponse res,

String path) throws ServletException, IOException {

try {

RequestDispatcher dispatcher = req.getRequestDispatcher(path);

dispatcher.forward(req, res);

}catch(Exception e) {

e.printStackTrace();

}

}

}

적용된 패턴: MVC2 - FrontController, Command 패턴

    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

<dependency>

    <groupId>javax.servlet</groupId>

    <artifactId>javax.servlet-api</artifactId>

    <version>4.0.1</version>

    <scope>provided</scope>

</dependency>

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns="http://java.sun.com/xml/ns/javaee" 

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 

id="WebApp_ID" version="3.0">

  <display-name>Archetype Created Web Application</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.do</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.do</welcome-file>

  </welcome-file-list>

  <servlet>

  <servlet-name>FrontController</servlet-name>

  <servlet-class>com.member.web.controller.FrontController</servlet-class>

  <init-param>

<param-name>charset</param-name>

<param-value>UTF-8</param-value>

</init-param>

  </servlet>

  <servlet-mapping>

  <servlet-name>FrontController</servlet-name>

  <url-pattern>*.do</url-pattern>

  </servlet-mapping>

</web-app>

package com.member.web.controller;

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 HttpUtil extends HttpServlet {

private static final long serialVersionUID = 1L;

private static String charset = null;

public static void forward(HttpServletRequest req, HttpServletResponse res,

String path) throws ServletException, IOException {

try {

RequestDispatcher dispatcher = req.getRequestDispatcher(path);

dispatcher.forward(req, res);

}catch(Exception e) {

e.printStackTrace();

}

}

}

package com.member.web.controller;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public interface Controller {

public void execute(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException;

}

package com.member.web.controller;

import java.io.IOException;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class FrontController extends HttpServlet {

private static final long serialVersionUID = 1L;

private String charset = null;

    public FrontController() {

        super();

    }

protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

doAction(req, res);

}

protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

doGet(req, res);

}

protected void doAction(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

ServletConfig sc = this.getServletConfig();

charset = sc.getInitParameter("charset");

req.setAttribute("charset", charset);

req.setCharacterEncoding(charset);

res.setContentType("text/html; charset=" + charset);

String uri = req.getRequestURI();

String conPath = req.getContextPath();

String command = uri.substring(conPath.length());

Controller subController = null;

if(command.equals("/member/login.do")){

System.out.println("login");

System.out.println("----------------");

subController = new MemberLoginController();

    subController.execute(req, res);

}else if (command.equals("/member/process.do")) {

System.out.println("process");

System.out.println("----------------");

subController = new MemberProcessController();

    subController.execute(req, res);

}else if (command.equals("/member/logon.do")) {

System.out.println("logon");

System.out.println("----------------");

subController = new MemberLogonController();

    subController.execute(req, res);

}else if (command.equals("/member/logout.do")) {

System.out.println("logout");

System.out.println("----------------");

subController = new MemberLogoutController();

    subController.execute(req, res);

}else if (command.equals("/member/sessionAllKill.do")) {

System.out.println("sessionAllKill");

System.out.println("----------------");

subController = new MemberSessionAllKillController();

    subController.execute(req, res);

}else if (command.equals("/member/errorAlert.do")) {

System.out.println("errorAlert");

System.out.println("----------------");

subController = new MemberErrorAlertController();

    subController.execute(req, res);

}

// end of if

}

}

[비고]

MemberLoginController()

MemberProcessController()

MemberLogonController()

MemberLogoutController()

MemberSessionAllKillController()

MemberErrorAlertController()

약 6개의 Controller들은 추후 생성할 것이다.

다소 이름이 길긴 하지만, 추후 고민할 문제해봐도 되는 문제이고 진행하도록 하겠다.

실제 설계하고 코딩했을 때는 바로 저 코드가 한번에 나오지 않았다는 것이다.

단계, 단계 구간별로 필요에 의해서 하나 하나 만들어진 것이다.

[JSP] 14. Jsp/Servlet(MVC) - Session(세션) 프로젝트(로그인) - (2), 2020-09-25

https://yyman.tistory.com/1417