Intellij JSP - Servlet Life Cycle (생명 주기, 선처리, 후처리)

Servlet Life Cycle (생명 주기, 선처리, 후처리)

• Project - ServletTest

  • Servlet.java

      import javax.annotation.PostConstruct;
      import javax.annotation.PreDestroy;
      import javax.servlet.ServletException;
      import javax.servlet.ServletRequest;
      import javax.servlet.ServletResponse;
      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(value = "/Serv")
      public class Servlet extends HttpServlet {
              @PostConstruct
              private void initPostConstruct(){
                      System.out.println("initPostConstruct!!");
              }
    
              @Override
              public void init() throws ServletException {
                      super.init();
                      System.out.println("init!!");
              }
    
              @Override
              protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
                      super.service(req, resp);
                      System.out.println("HttpServlet Service");
              }
    
              @Override
              public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
                      super.service(req, res);
                      System.out.println("Servlet Service");
              }
    
              protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {
                      PrintWriter out = response.getWriter();
                      out.println("DD POST");
                      System.out.println("doPost!!");
              }
    
              protected void doGet(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {
                      PrintWriter out = response.getWriter();
                      out.println("DD GET");
                      System.out.println("doGet!!");
              }
    
              @Override
              public void destroy() {
                      super.destroy();
                      System.out.println("destroy!!");
              }
    
              @PreDestroy
              private void destroyPreDestroy(){
                      System.out.println("destroyPreDestroy!!");
              }
      }
    

• Servlet Life Cycle

  1. @PostConstruct - (선처리) 어노테이션을 사용하여 임의의 메소드 생성

  2. init() - Override 메소드

  3. doGet(),doPost()

  4. service(…, …) - Override 메소드

  5. destroy() - Override 메소드

  6. @PreDestroy - (후처리) 어노테이션을 사용하여 임의의 메소드 생성

  

• 신입SW인력을 위한 실전 JSP