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관리 메뉴

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[Servlet] 회원 관리 웹 애플리케이션 본문

인프런/[인프런] 스프링 MVC 1

[Servlet] 회원 관리 웹 애플리케이션

Seung__ 2021. 9. 9. 21:05

1. MemberFormServlet

  • 회원 등록 폼
  • servlet 단점...html 자바 코드로 넣어야함.. ㅜㅜㅜ
@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");

        //아 자바로 HTML 넣어야함.. 극혐
        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");

    }
}

 

2. MemberSaveServlet

@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);

        response.setContentType("test/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>");

    }
}

 

 

3. List조회

  • 회원 목록 HTML을 for를 통해  동적으로 생성, 응답
@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>");
        /*
        w.write(" <tr>");
        w.write(" <td>1</td>");
        w.write(" <td>userA</td>");
        w.write(" <td>10</td>");
        w.write(" </tr>");
        */
        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>");

    }
}

 

4.템플릿 엔진이 필요..

서블릿 덕분에 자바 코드로 동적으로 HTML을 만들 수 있었음.

근데..허허 굉장히 비효율적이고,, 오류 가능성이 많음.

HTML에 자바 코드가 들어가면 좋을텐데.. .라고해서 나온게 템플릿 엔진임.

 

 

 


5. GitHub : 210909 WebApplication with Servlet

 

GitHub - bsh6463/MVC1

Contribute to bsh6463/MVC1 development by creating an account on GitHub.

github.com

 

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