JSP | JeongKeepsCalm

JSP

Posted May 9, 2024 2 min read

JSP Basic

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<!-- save.jsp -->
<%@ page import="hello.servlet.domain.member.MemberRepository" %>
<%@ page import="hello.servlet.domain.member.Member" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
  // request, response 사용 가능
  MemberRepository memberRepository = MemberRepository.getInstance();
  System.out.println("save.jsp");
  String username = request.getParameter("username");
  int age = Integer.parseInt(request.getParameter("age"));
  Member member = new Member(username, age);
  System.out.println("member = " + member);
  memberRepository.save(member);
%>
<html>
<head>
  <meta charset="UTF-8">
  </head>
<body>
  성공
  <ul>
  <li>id=<%=member.getId()%></li>
  <li>username=<%=member.getUsername()%></li>
  <li>age=<%=member.getAge()%></li>
  </ul>
  <a href="/index.html">메인</a>
</body>
</html>

<!-- members.jsp -->
<%@ page import="java.util.List" %>
<%@ page import="hello.servlet.domain.member.MemberRepository" %>
<%@ page import="hello.servlet.domain.member.Member" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
  MemberRepository memberRepository = MemberRepository.getInstance();
  List<Member> members = memberRepository.findAll();
%>
<html>
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <a href="/index.html">메인</a>
  <table>
    <thead>
      <th>id</th>
      <th>username</th>
      <th>age</th>
    </thead>
    <tbody>
      <%
        for (Member member : members) {
        out.write(" <tr>");
        out.write(" <td>" + member.getId() + "</td>");
        out.write(" <td>" + member.getUsername() + "</td>");
        out.write(" <td>" + member.getAge() + "</td>");
        out.write(" </tr>");
        }
      %>
    </tbody>
  </table>
</body>
</html>

<%@ page contentType=”text/html;charset=UTF-8” language=”java” %>: 첫 줄은 JSP문서라는 뜻이다. JSP 문서는 이렇게 시작해야 한다.
JSP는 서버 내부에서 서블릿으로 변환된다.
<% ~~ %>: 자바 코드 입력 가능
<%= ~~ %>: 자바 코드 출력 가능


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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<c:forEach var="item" items="${members}">
  <tr>
    <td>${item.id}</td>
    <td>${item.username}</td>
    <td>${item.age}</td>
  </tr>
</c:forEach>

<ul>
  <li>id=${member.id}</li>
  <li>username=${member.username}</li>
  <li>age=${member.age}</li>
</ul>

taglib 사용 () ${}: JSP는 해당 문법을 제공하는데, 이 문법을 사용하면 request의 attribute에 담긴 데이터를 편리하게 조회 가능하다.

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