addTalk.jsp
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("EUC-KR");
String id = request.getParameter("id");
String talk = request.getParameter("talk");
ArrayList<String> id_list = (ArrayList<String>) application.getAttribute("id_list");
ArrayList<String> talk_list = (ArrayList<String>) application.getAttribute("talk_list");
if (id_list == null) {
id_list = new ArrayList<String>();
talk_list = new ArrayList<String>();
}
id_list.add(id);
talk_list.add(talk);
application.setAttribute("id_list", id_list);
application.setAttribute("talk_list", talk_list);
response.sendRedirect("main.jsp");
%>
</body>
</html>
main.jsp
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
<style>
div {
width: 100%;
margin: 0px atuo;
text-align: center;
}
table {
width: 400px; margin : 0px auto;
text-align: center;
border: 1px solid black;
margin: 0px auto;
}
</style>
</head>
<body>
<div>
<form action="addTalk.jsp" method="post">
<input type="text" name="id" placeholder="아이디 입력"> : <input
type="text" name="talk" placeholder="하고 싶은 말"> <input
type="submit" value="전송">
</form>
<%
ArrayList<String> id_list = (ArrayList<String>) application.getAttribute("id_list");
ArrayList<String> talk_list = (ArrayList<String>) application.getAttribute("talk_list");
%>
<br />
<table>
<tr>
<td>아이디</td>
<td>하고 싶은 말</td>
</tr>
<%
if (id_list != null) { // 작성한 말이 없을 때 null point Exception 발생 처리
for (int i = (id_list.size() - 1); i >= 0; i--) {
%>
<tr>
<td><%=id_list.get(i)%></td>
<td><%=talk_list.get(i)%></td>
<%
}
}
%>
</tr>
</table>
</div>
</body>
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