package com.fastcampus.ch2;

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;

import javax.servlet.http.HttpServletRequest;

// 필터를 적용할 요청의 패턴 지정 - 모든 요청에 필터를 적용.

@WebFilter(urlPatterns="/*")

public class PerformanceFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

// 초기화 작업

}

@Override

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

throws IOException, ServletException {

// 1. 전처리 작업

long startTime = System.currentTimeMillis();

// 2. 서블릿 또는 다음 필터를 호출

chain.doFilter(request, response);

// 3. 후처리 작업

System.out.print("["+((HttpServletRequest)request).getRequestURI()+"]");

System.out.println(" 소요시간="+(System.currentTimeMillis()-startTime)+"ms");

}

@Override

public void destroy() {

// 정리 작업

}

}