1. 기본 개발환경
Web Application를 선택한다.
프로젝트 이름을 적어준다.
서버를 설정해줘야 한다. 필자는 Tomcat 9.0 버전을 사용할 것이다.
Add버튼을 클릭하고 Server Location 경로를 Tomcat이 설치된 곳으로 바꾼다
UserModeTest가 생긴 것이 보인다. 마우스 오른쪽 버튼을 눌러 Servlet을 추가해주자!
2. 간단한 서블릿 예제 실습
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import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
/** * * @author user1 */ @WebServlet(urlPatterns = {"/UserModeTest"}) public class UserModeTest extends HttpServlet {
/** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> * methods. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8");
try(PrintWriter out = response.getWriter()){
String mode = request.getParameter("mode"); if(mode !=null){ if (mode.equals("manager")){ showManagerModeContent(out); } else if(mode.equals("user")){ showUserModeContent(out);
} else { showUnknownUserModeContent(out);
} } else{ showNomodeContent(out); } } }
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * * @param request * @param response * @throws ServletException * @throws IOException */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); }
/** * Handles the HTTP <code>POST</code> method. * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); }
/** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold>
private void showManagerModeContent(PrintWriter out) { out.println("<html>"); out.println("<head>"); out.println("<title>일반 사용자 모드 화면</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>당신은 일반 사용자입니다.<h1>"); out.println("</body>"); out.println("</html>");
}
private void showUserModeContent(PrintWriter out) { out.println("<html>"); out.println("<head>"); out.println("<title>관리자 모드 화면</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>당신은 관리자입니다.<h1>"); out.println("</body>"); out.println("</html>");
}
private void showUnknownUserModeContent(PrintWriter out) { out.println("<html>"); out.println("<head>"); out.println("<title> UnknownUserMode 모드 화면</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>당신은 누굽니까? <h1>"); out.println("</body>"); out.println("</html>");
}
private void showNomodeContent(PrintWriter out) { out.println("<html>"); out.println("<head>"); out.println("<title>모드 없음 화면</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>mode 파라미터가 없습니다.<h1>"); out.println("<bold>사용법<bold>"); out.println("http://localhost:8084/UserModeTest/?[mode|user]"); out.println("</body>"); out.println("<html>");
}
} |
gerparameter를 검사하여 알맞은 페이지를 출력해준다.
파라미터 값이 없을 때
파라미터 값이 있을 때
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