🪴 서블릿으로 회원관리 작성
JSP 등의 사용 없이 순수 자바 코드만으로 회원관리 작성
MemberFormServlet - 회원 등록
package hello.servlet.web.servlet;
import hello.servlet.domain.member.MemberRepository;
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 java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "memberFormServlet", urlPatterns = "/servlet/members/new-form")
public class MemberFormServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance(); //싱글톤이여서 객체 생성 불가 get instance로 가져오기
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
PrintWriter w = resp.getWriter();
//[회원 등록 양식 java 코드로 작성]
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");
}
}MemberSaveServlet - 저장된 회원 조회
package hello.servlet.web.servlet;
import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
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 java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "memberSaveServlet", urlPatterns = "/servlet/members/save")
public class MemberSaveServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance(); //저장을 위해 선언
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("MemberSaveServlet.service");
String username = req.getParameter("username"); //등록된 회원 가져오기
int age = Integer.parseInt(req.getParameter("age")); //등록된 나이 가져오기
//MemberRepository 저장하기
Member member = new Member(username, age);
memberRepository.save(member);
//전송받은 데이터 형식 지정
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
PrintWriter w = resp.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>");
}
}
/**
* form 에서 가져온 데이터를 저장하는 로직
* 메모리에 저장되어서 서버를 재가동시 refresh됨
*/MemberListServlet - 저장된 모든 회원 조회
package hello.servlet.web.servlet;
import hello.servlet.domain.member.Member;
import hello.servlet.domain.member.MemberRepository;
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 java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
@WebServlet(name = "memberListServlet", urlPatterns = "/servlet/members")
public class MemberListServlet extends HttpServlet {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
List<Member> members = memberRepository.findAll();
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
PrintWriter w = resp.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>");
}
}
Study of beginner dev