servlet03
S01AttributeServlet
package servlet03;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S01AttributeServlet
*/
@WebServlet("/servlet03/s01")
public class S01AttributeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S01AttributeServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 4. 결과를 request에 저장
request.setAttribute("userName", "donald");
// 5. 알맞은 뷰로 포워딩
String path = "/WEB-INF/view/servlet03/s01.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}doGet 메소드 안에서 request.setAttribute 로 username 에 donald 저장
그리고 s01.jsp 로 포워딩
s01.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%= request.getContextPath() %>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<div class="container">
<h1>Hello ${userName }</h1>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>여기에서 username 을 donald 로 전달받을 수 있다
S02AttributeServlet
package servlet03;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S02AttributeServlet
*/
@WebServlet("/servlet03/s02")
public class S02AttributeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S02AttributeServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 4. 데이터를 request attribute로 저장
request.setAttribute("food", "pizza");
// 5. forward
String path = "/WEB-INF/view/servlet03/s02.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}마찬가지. request.setAttribute 로 food 에 pizza 저장, s02.jsp 로 포워딩
s02.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%= request.getContextPath() %>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<h1>내가 좋아하는 음식 : ${food }</h1>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>food 에 pizza 전달받음
servlet04
S01LogicServlet
package servlet04;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S01LogicServlet
*/
@WebServlet("/servlet04/s01")
public class S01LogicServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S01LogicServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 3. 비즈니스 로직 실행 (CRUD - 데이터 추가, 읽기, 수정, 삭제), (로그인, 로그아웃, 파일 추가/삭제)
List<String> list = new ArrayList<>();
list.add("pizza");
list.add("cake");
list.add("icecream");
// 4. set attribute
request.setAttribute("foods", list);
// 5. forward
String path = "/WEB-INF/view/servlet04/s01.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}doGet 메소드 안에서
리스트생성, 값 추가
request.setAttribute 로 리스트를 foods 에 저장
s01.jsp 로 포워딩
s01.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<!-- .container>.row>.col -->
<div class="container">
<div class="row">
<div class="col">
<h1>좋아하는 음식들</h1>
<ul>
<c:forEach items="${foods }" var="food">
<li>${food }</li>
</c:forEach>
</ul>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>foods 에 저장된 리스트를 리스트로 출력 (forEach 로 값을 모두 출력)
S02LogicServlet
package servlet04;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S02LogicServlet
*/
@WebServlet("/servlet04/s02")
public class S02LogicServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S02LogicServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 3. 여행가고 싶은 곳 리스트 완성
List<String> list = new ArrayList<>();
list.add("seoul");
list.add("jeju");
list.add("new york");
// 4. 리스트를 request attribute에 추가
request.setAttribute("locations", list);
// 5. jsp로 forward
String path = "/WEB-INF/view/servlet04/s02.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}마찬가지
s02.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<%--
요청 경로 : /servlet04/s02 (get)
서블릿 : S02LogicServlet
- locations attribute를 request에 담아서
- s02.jsp로 포워드
--%>
<!-- .container>.row>.col -->
<div class="container">
<div class="row">
<div class="col">
<h1>여행가고 싶은 곳</h1>
<ul>
<c:forEach items="${locations }" var="location">
<li>${location }</li>
</c:forEach>
</ul>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>마찬가지
servlet05
S01RequestServlet
package servlet05;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S01RequestServlet
*/
@WebServlet("/servlet05/s01")
public class S01RequestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S01RequestServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 2. request 분석, request parameter 처리/가공
String param = request.getParameter("info");
// 3. business logic
List<String> list = new ArrayList<>();
String title = "";
if (param.equals("travel")) {
// 여행관련일.
list.add("seoul");
list.add("paris");
title = "여행가고 싶은 곳";
} else if (param.equals("food")) {
// 음식관련일.
list.add("pizza");
list.add("icecream");
title = "좋아하는 음식";
}
// 4. set attribute
request.setAttribute("title", title);
request.setAttribute("list", list);
// 5. forward
String path = "/WEB-INF/view/servlet05/s01.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}* @WebServlet(요청경로) 로 실행 요청을 하면, 해당 servlet 을 실행하게 됨 (그래서 실행했을 때 페이지 주소창에 요청경로가 표시됨)
doGet 메소드로 일을 수행함
doGet 메소드 안에서는
2. request 분석, request parameter 처리/가공 (servlet05 - now!)
3. business logic (servlet04)
4. set attribute (servlet03)
5. forward (servlet02)
의 일을 함
info 를 받아서 info=travel 이면 list 에 도시이름값 추가하고 title 저장, info=food 이면 list 에 음식이름값 추가하고 title 저장
title 과 list 전달하고 s01.jsp 로 포워딩
info 는 어디서 받아? 쿼리스트링으로 입력해
s01.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col">
<h1>${title }</h1>
<ul>
<c:forEach items="${list }" var="item">
<li>${item }</li>
</c:forEach>
</ul>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>title 이랑 list 의 항목 모두 출력
S02RequestServlet
package servlet05;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S02RequuestServlet
*/
@WebServlet("/servlet05/s02")
public class S02RequuestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S02RequuestServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 2. 요청(request) 분석/가공
String country = request.getParameter("country");
country = country == null ? "" : country;
// 3. business logic 실행
List<String> list = new ArrayList<>();
if (country.equals("미국")) {
// 미국관련일..
list.add("newyork");
list.add("chicago");
} else if (country.equals("한국")) {
// 한국 관련일...
list.add("seoul");
list.add("jeju");
}
// 4. 결과 데이터를 request or session attribute로 담기
request.setAttribute("cities", list);
request.setAttribute("country", country);
// 5. forward or redirect
String path = "/WEB-INF/view/servlet05/s02.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
문자열 country 에 전달받아온 country 저장
country 가 null 이면 country="", null 이 아니면 country=country
list 생성, country 가 미국이면 리스트에 미국 도시 이름 추가, 한국이면 리스트에 한국 도시 이름 추가
list, country 를 전달, s02 로 포워딩
s02.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<%--
요청경로 : (get) /servlet05/s02
서블릿 : S02RequestServlet
request파라미터 : country
country 파라미터의 값 : 미국/한국
--%>
<!-- .container>.row>.col -->
<div class="container">
<div class="row">
<div class="col">
<h1>${country }의 도시들</h1>
<ul>
<c:forEach items="${cities }" var="city">
<li>${city }</li>
</c:forEach>
</ul>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>
servlet06
S01MainServlet
package servlet06;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S01MainServlet
*/
@WebServlet("/servlet06/main")
public class S01MainServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S01MainServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 2. request 분석/가공
// 3. business logic
// 4. set attribute
// 5. forward/redirect
String path = "/WEB-INF/view/servlet06/s01main.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}다른 절차들이 필요 없을 때는 안해도 됨
s01main.jsp 로 포워딩
s01main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-2">
<nav class="nav flex-column">
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/main">메인</a>
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/add">추가</a>
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/list">목록</a>
</nav>
</div>
<div class="col-10">
<h1>할 일 목록 APP</h1>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>메인, 추가, 목록 - 각각 링크를 main, add, list 서블릿에 걸어줌
할 일 목록
S02AddServlet
package servlet06;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
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 javax.servlet.http.HttpSession;
/**
* Servlet implementation class S01AddServlet
*/
@WebServlet("/servlet06/add")
public class S02AddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S02AddServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// forward
String path = "/WEB-INF/view/servlet06/s02add.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 0. 사전 작업
HttpSession session = request.getSession();
List<String> list = (List<String>) session.getAttribute("todoList");
if (list == null) {
list = new ArrayList<>();
session.setAttribute("todoList", list);
}
// 2. request 파라미터 분석/가공
String todo = request.getParameter("todo");
todo = todo == null ? "" : todo;
// 3. business logic
if (!todo.isEmpty()) {
list.add(todo);
}
// 4. attribute 추가
// 5. forward/redirect
String path = request.getContextPath() + "/servlet06/list";
response.sendRedirect(path);
}
}헐 doGet 에서는 02add.jsp 로 포워딩만 함
doPost 에서
list 생성, todoList 가져와서 list 에 저장
list 가 null 이면 list 생성 todoList 로 저장
문자열 todo 에 todo 받아서 저장
그리고 그 todo 에 todo 가 null 이면 "", null 이 아니면 todo 저장
todo 가 비어있다면 리스트에 todo 추가
S03ListServlet 서블릿으로 리디렉트
<doPost>
doPost 메소드 사용하는 이유
/servlet06/add 경로로 post 방식으로 요청이 오기 때문에
0. 사전작업
2. request 파라미터 분석/가공
3. business logic
4. attribute 추가
5. forward/redirect
s02add.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-2">
<nav class="nav flex-column">
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/main">메인</a>
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/add">추가</a>
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/list">목록</a>
</nav>
</div>
<div class="col-10">
<h1>할 일 추가</h1>
<form action="${pageContext.request.contextPath }/servlet06/add" method="post">
<div class="form-group">
<label for="todo1">할 일</label>
<input type="text" id="todo1" class="form-control" name="todo">
</div>
<input type="submit" class="btn btn-primary" value="추가">
</form>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>메인, 추가, 목록 - 각각 링크를 main, add, list 서블릿에 걸어줌
할 일 추가 - 할 일
form 태그의 action 으로 add 서블릿으로 내용 전달
S03ListServlet
package servlet06;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class S03ListServlet
*/
@WebServlet("/servlet06/list")
public class S03ListServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public S03ListServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = "/WEB-INF/view/servlet06/s03list.jsp";
request.getRequestDispatcher(path).forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}doGet 만 작성됨
s03list.jsp 로 포워딩
s03list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="<%=request.getContextPath()%>/resource/css/icon/css/all.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">
<title>Insert title here</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-2">
<nav class="nav flex-column">
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/main">메인</a>
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/add">추가</a>
<a class="nav-link" href="${pageContext.request.contextPath }/servlet06/list">목록</a>
</nav>
</div>
<div class="col-10">
<h1>할 일 목록</h1>
<ul>
<c:forEach items="${todoList }" var="todo">
<li>${todo }</li>
</c:forEach>
</ul>
</div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
</body>
</html>메인, 추가, 목록 - main, add, list 서블릿으로 링크 걸어줌
todo 안의 항목을 forEach 로 다 출력, 리스트로
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