Re: ReDirect에서 ServletContext로 Scope 연결 해보기 - 주용현,임동혁,강송찬

[강송찬]

FirstServlet

package ex2;

import java.io.IOException;

import jakarta.servlet.ServletContext;

import jakarta.servlet.ServletException;

import jakarta.servlet.annotation.WebServlet;

import jakarta.servlet.http.HttpServlet;

import jakarta.servlet.http.HttpServletRequest;

import jakarta.servlet.http.HttpServletResponse;

//이동 방식, Foward, Redirect : 주채객체는 - request, response 객체

@WebServlet("/first")

public class FirstServlet extends HttpServlet {

private ServletContext ctx; // null값 선언만

// 생성을 하고

@Override

public void init() throws ServletException {

ctx=getServletContext();

}

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

System.out.println("FirstServlet 실행이 됨");

// 페이지 이동 : redirect

// 실험 1) request일 떄 request A와 B간의 forward 이동방식을 때, scope의 값이 유지된다.*****

req.setAttribute("msg", "테스트!");

ctx.setAttribute("mymsg", "집가고싶다");

//ctx.getAttribute("mymsg"); => second에서 불러서 출력해보기

resp.sendRedirect("second?msg1=test");

}

}

SecoundServlet

package ex2;

import java.io.IOException;

import java.io.PrintWriter;

import jakarta.servlet.ServletContext;

import jakarta.servlet.ServletException;

import jakarta.servlet.annotation.WebServlet;

import jakarta.servlet.http.HttpServlet;

import jakarta.servlet.http.HttpServletRequest;

import jakarta.servlet.http.HttpServletResponse;

@WebServlet("/second")

public class SecoundServlet extends HttpServlet {

private ServletContext ctx; // null값 선언만

@Override

public void init() throws ServletException {

ctx = getServletContext();

}

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

// req.setAttribute("key","vel"); => req.getAttribute("key")

String msg1 = req.getParameter("msg1");

resp.setContentType("text/html;charset=UTF-8");

System.out.println("여기는 SecondServlet");

ServletContext ctx = getServletContext();

PrintWriter out = resp.getWriter();

out.println("<ul>");

out.println("<li>" + req.getAttribute("msg") + "</li>");

out.println("<li>" + ctx.getAttribute("mymsg") + "</li>");

out.println("<li>" + msg1 + "</li>");

out.println("</ul>");

}

}