회원 추가 / 회원 저장 / 회원 리스트 Subvlet
# 회원 추가 Servlet
reponse 객체 헤더를 설정하고, PrintWriter를 통해 텍스트(HTML)을 전달한다. /servlet/members/save로 이동하며, username과 age를 전달한다.
@WebServlet(name = "memberFormServlet", urlPatterns = "/servlet/members/new-form")
public class MemberFormServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter w = response.getWriter();
w.write("<!DOCTYPE html>\n" +
"<html>\n" +
"<head>\n" +
" <meta charset=\"UTF-8\">\n" +
" <title>Title</title>\n" +
"</head>\n" +
"<body>\n" +
"<form action=\"/servlet/members/save\" method=\"post\">\n" +
" username: <input type=\"text\" name=\"username\" />\n" +
" age: <input type=\"text\" name=\"age\" />\n" +
" <button type=\"submit\">전송</button>\n" + "</form>\n" +
"</body>\n" +
"</html>\n");
}
}
# 회원 저장 Subvlet
members/new-form으로 부터 데이터를 추출해야한다. request 객체의 getParameter()를 호출하여 넘어온 값을 추출하고, Member 객체를 선언해서 save 한다.
@WebServlet(name = "memberSaveServlet", urlPatterns = "/servlet/members/save")
public class MemberSaveServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("MemberSaveServlet.service");
String username = request.getParameter("username");
int age = Integer.parseInt(request.getParameter("age"));
Member member = new Member(username, age);
memberRepository.save(member);
// 저장 잘 되었는지 확인
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter w = response.getWriter();
w.write("<html>\n" +
"<head>\n" +
" <meta charset=\"UTF-8\">\n" + "</head>\n" +
"<body>\n" +
"성공\n" +
"<ul>\n" +
" <li>id="+member.getId()+"</li>\n" +
" <li>username="+member.getUsername()+"</li>\n" +
" <li>age="+member.getAge()+"</li>\n" + "</ul>\n" +
"<a href=\"/index.html\">메인</a>\n" + "</body>\n" +
"</html>");
}
}
# 회원 리스트 Subvlet
List<Member>자료형의 members를 선언하여 memberRepository의 findAll() 메서드를 호출하여 모든 Member 값을 보여준다. 이를 HTML로 Member 반복문을 통해 그려낸다.
@WebServlet(name="memberListServlet", urlPatterns = "/servlet/members")
public class MemberListServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<Member> members = memberRepository.findAll();
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter w = response.getWriter();
w.write("<html>");
w.write("<head>");
w.write(" <meta charset=\"UTF-8\">");
w.write(" <title>Title</title>");
w.write("</head>");
w.write("<body>");
w.write("<a href=\"/index.html\">메인</a>");
w.write("<table>");
w.write(" <thead>");
w.write(" <th>id</th>");
w.write(" <th>username</th>");
w.write(" <th>age</th>");
w.write(" </thead>");
w.write(" <tbody>");
for (Member member : members) {
w.write(" <tr>");
w.write(" <td>" + member.getId() + "</td>");
w.write(" <td>" + member.getUsername() + "</td>");
w.write(" <td>" + member.getAge() + "</td>");
w.write(" </tr>");
}
w.write(" </tbody>");
w.write("</table>");
w.write("</body>");
w.write("</html>");
}
}
출처
https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-mvc-1/dashboard
스프링 MVC 1편 - 백엔드 웹 개발 핵심 기술 - 인프런 | 강의
웹 애플리케이션을 개발할 때 필요한 모든 웹 기술을 기초부터 이해하고, 완성할 수 있습니다. 스프링 MVC의 핵심 원리와 구조를 이해하고, 더 깊이있는 백엔드 개발자로 성장할 수 있습니다., 원
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