[JSP] filter - monitor.log

allrouvel 2024. 3. 20. 18:12

2024. 3. 20. 18:12

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18_01_filter02.jsp
18_01_filter02_process.jsp

18_01_filter02.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h3>회원가입</h3>
	<form action="18_01_filter02_process.jsp" method="post">
		<p>아이디 : <input type="text" name="id">
		<p>비밀번호 : <input type="text" name="passwd">
		<input type="submit" value="전송"></p>
	</form>
</body>
</html>

18_01_filter02_process.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		String id = request.getParameter("id");
		String passwd = request.getParameter("passwd");
	%>
	<p> 입력된 id값 : <%=id %></p>
	<p> 입력된 pw값 : <%=passwd %></p>
</body>
</html>

package com.filter;

import java.io.IOException;
import java.io.PrintWriter;

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.annotation.WebInitParam;
import javax.servlet.http.HttpFilter;

//@WebFilter(filterName = "Filter02", urlPatterns = { "/18_01_filter02_process.jsp" }, initParams = {
//		@WebInitParam(name = "param1", value = "admin"), @WebInitParam(name = "param2", value = "1234") })
public class InitParamFilter implements Filter {
	private FilterConfig filterConfig = null;

	public void init(FilterConfig fConfig) throws ServletException {
		System.out.println("Filter02 초기화...");
		this.filterConfig = fConfig;
		
		/*
		 * param1 => admin, param2 =>1234
		 * */
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		System.out.println("Filter02 수행...");
		request.setCharacterEncoding("UTF-8");
		
		String id = request.getParameter("id");
		String passwd = request.getParameter("passwd");
		
		String param1 = filterConfig.getInitParameter("param1");
		String param2 = filterConfig.getInitParameter("param2");

		String message;
		
//		PrintWriter writer = response.getWriter();
		//앞에 기술 시 ??? 로 표기됨
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html; charset=UTF-8");
		PrintWriter writer = response.getWriter();
		
		if(id.equals(param1) && passwd.equals(param2)) message = "로그인 성공했습니다.";
		else message = "로그인 실패했습니다.";
		
		writer.println(message);
		chain.doFilter(request, response);
	}

	public void destroy() {
		System.out.println("Filter02 해제..");
		this.filterConfig =null;
	}

}

package com.filter;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

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.annotation.WebInitParam;
import javax.servlet.http.HttpFilter;


//@WebFilter(filterName = "Filter02_2", 
//		urlPatterns = { "/18_01_filter02_process.jsp" },
//		initParams = {@WebInitParam(name = "filename", value = "monitor.log")})
public class LogFileFilter implements Filter {
       PrintWriter writer; //null
    
    private String getCurrentTime() {
    	DateFormat formatter = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.S");
    	Calendar calendar = Calendar.getInstance();
    	calendar.setTimeInMillis(System.currentTimeMillis());
    	return formatter.format(calendar.getTime());
    }
       //init 웹서버가 시작될 때 실행됨.
	public void init(FilterConfig fConfig) throws ServletException {
		System.out.println("Filter02_2 초기화...");
		String realpath = "C:\\log\\";
		File f = new File(realpath);
		if(!f.exists()) {f.mkdirs();}
		
		String filename = fConfig.getInitParameter("filename"); //monitor.log
		if(filename==null) throw new ServletException("로그 파일의 이름을 찾을 수 없습니다.");
		try {writer = new PrintWriter(new FileWriter(realpath+filename, true), true);}
		//PrintWriter - 객체를 생성하면서 파일을 받으면 그 파일에 쓴다.
		//객체를 얻어올 때 response.. 겟라이터
		
		catch(IOException e) {throw new ServletException("로그 파일을 열 수 없습니다.");}
	}
	//url-pattern 설정한 곳에 호출되었을 때 실행됨.
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		
		System.out.println("Filter02_2 doFilter()...");
		writer.printf("현재일시 : %s %n", getCurrentTime());
		String clientAddr = request.getRemoteAddr();
		writer.printf("클라이언트 주소 : %s %n", clientAddr);
		
		chain.doFilter(request, response);
		
		writer.printf("현재일시 : %s %n", getCurrentTime());
		String contentType = response.getContentType();
		writer.printf("문서의 콘텐츠 유형 : %s %n", contentType);
		writer.println("----------------------------------------");
		
	}
	//웹서버가 종료되었을 때 실행됨.
	public void destroy() {
		writer.println("destroy()메소드 호출. 강제 해제");
		writer.close();
	}
	public LogFileFilter() {
		super();
	}


}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
	id="WebApp_ID" version="4.0">
	<display-name>jspthree</display-name>


<!-- Filter02_2 -->
<!-- 	필터객체 생성 -->
	<filter>
		<filter-name>Filter02_2</filter-name>
		<filter-class>com.filter.LogFileFilter</filter-class>
		<init-param>
			<param-name>filename</param-name>
			<param-value>monitor.log</param-value>
		</init-param>
	</filter>
<!-- 	필터객체 사용 -->
	<filter-mapping>
		<filter-name>Filter02_2</filter-name>
		<url-pattern>/18_01_filter02_process.jsp</url-pattern>
	</filter-mapping>
	
	
	
<!-- Filter02 -->
	<filter>
		<filter-name>Filter02</filter-name>
		<filter-class>com.filter.InitParamFilter</filter-class>
		<init-param>
			<param-name>param1</param-name>
			<param-value>admin</param-value>
		</init-param>
		<init-param>
			<param-name>param2</param-name>
			<param-value>1234</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>Filter02</filter-name>
		<url-pattern>/18_01_filter02_process.jsp</url-pattern>
	</filter-mapping>








	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.jsp</welcome-file>
		<welcome-file>default.htm</welcome-file>
	</welcome-file-list>
</web-app>

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