<이공계기술전문연수> 6. Servlet / JSP Servlet Filter

Servlet Filter
-> 필터란 클라이언트와 서버 사이에서 request response 객체를 필터가 먼저 받아서 사전작업/사후작업 등

공통적으로 필요한 부분을 처리

package org.kh.common;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
 * Servlet Filter implementation class TestFilter
 */
@WebFilter("/TestFilter")
public class TestFilter implements Filter {

    /**
     * Default constructor. 
     */
    public TestFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		//request를 가로채서 로직을 처리하는 코드
		System.out.println("Servlet 도착 전 필터 출력");
		String id = request.getParameter("memberId");
		System.out.println(id + "님이 로그인 시도");
		chain.doFilter(request, response);
		System.out.println("Servlet 작업 수행 후 필터 출력");
		//response를 가로채서 로직을 처리하는 코드
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}

 

 

package org.kh.member.controller;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
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 javax.servlet.http.HttpSession;

import org.kh.member.model.service.MemberService;
import org.kh.member.model.vo.Member;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet(name = "Login", urlPatterns = { "/login" })
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		System.out.println("로그인 Servlet 시작");
		//1. 인코딩
		request.setCharacterEncoding("utf-8");
		//2. 변수저장
		String memberId = request.getParameter("memberId"); //name=id
		String memberPw = request.getParameter("memberPw");
		System.out.println(memberId);
		System.out.println(memberPw);
		//3. 비지니스로직처리
		MemberService service = new MemberService();
		Member m = service.login(memberId, memberPw);
		//4. view처리
		if(m!=null) {
			HttpSession session = request.getSession();
			session.setAttribute("member", m);
			//scope : session, request
			request.setAttribute("msg","로그인성공");
			//jsp에게 전달해주는것!! 담아쓸수있음
		}else {
			request.setAttribute("msg","로그인실패");
		}
		request.setAttribute("loc", "/index.jsp");
		// localhost 로 이동시킬거임    /만 써도됨!!
		RequestDispatcher rd = request.getRequestDispatcher("/WEB-INF/views/common/msg.jsp");
		rd.forward(request,response);
		
		System.out.println("로그인 Servlet 끝!");
		
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

 

 

package org.kh.common;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
 * Servlet Filter implementation class EncodeFilter
 */
@WebFilter("/EncodeFilter")
public class EncodeFilter implements Filter {

    /**
     * Default constructor. 
     */
    public EncodeFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding("utf-8");
		System.out.println("인코딩 완료");
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}