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매일코딩/Spring

27.springproject - log

by 인생여희 2016. 11. 18.
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* 로깅툴을 사용하는 이유


- System.out.println() 명령어는 IO 리소스를 많이 사용하여 시스템이 느려질 수 있음


- 로그를 파일로 저장하여 분석할 필요가 있음




* 로깅툴의 종류


- commons-logging : 스프링 3에서 사용하던 로깅툴


- log4j : 효율적인 메모리 관리로 그동안 많이 사용되었음


- logback : log4j 보다 성능이 더 우수하여 최근에 많이 사용되고 있음




* SLF4J : logback을 사용하기 위한 인터페이스



from : http://edu.lifesoft.org/board/show.aspx?category=spring&idx=379&page=0




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* 설정방법
 
 
 
1. pom.xml 의 slf4j-version 을 1.7.21 로 수정
 
 
 
    <properties>
 
        <java-version>1.8</java-version>
 
        <org.springframework-version>4.3.0.RELEASE</org.springframework-version>
 
        <org.aspectj-version>1.6.10</org.aspectj-version>
 
        <org.slf4j-version>1.7.21</org.slf4j-version>
 
    </properties>
 
 
 
2. pom.xml 에 라이브러리 추가
 
        <!-- logback 로깅 관련 -->
 
        <dependency>
 
            <groupId>org.slf4j</groupId>
 
            <artifactId>jcl-over-slf4j</artifactId>
 
            <version>1.7.21</version>
 
        </dependency>
 
        <dependency>
 
            <groupId>ch.qos.logback</groupId>
 
            <artifactId>logback-classic</artifactId>
 
            <version>1.1.7</version>
 
        </dependency>
 
cs




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3. src/main/resources 에 logback.xml 파일 작성
 
 
 
<?xml version="1.0" encoding="UTF-8"?>
 
<configuration>
 
 
 
    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
 
        <layout class="ch.qos.logback.classic.PatternLayout">
 
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-4level [%logger.%method:%line]-
 
                %msg%n</pattern>
 
        </layout>
 
    </appender>
 
 
 
    <appender name="LOGFILE"
 
        class="ch.qos.logback.core.rolling.RollingFileAppender">
 
        <file>/WEB-INF/logback.log</file>
 
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
 
            <fileNamePattern>logback.%d{yyyy-MM-dd}.log</fileNamePattern>
 
            <!-- 30일 지난 파일은 삭제한다. -->
 
            <maxHistory>30</maxHistory>
 
        </rollingPolicy>
 
        <encoder>
 
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-4level [%logger.%method:%line]
 
                - %msg %n</pattern>
 
        </encoder>
 
    </appender>
 
 
 
    <!-- 로그의 레벨( 지정된 로그 레벨 이상만 수집 ) : DEBUG < INFO < WARN < ERROR < FATAL -->
 
    <logger name="myweb" additivity="false">
 
        <level value="INFO" />
 
        <appender-ref ref="LOGFILE" />
 
        <appender-ref ref="CONSOLE" />
 
    </logger>
 
 
 
    <root>
 
        <level value="INFO" />
 
        <appender-ref ref="CONSOLE" />
 
    </root>
 
 
 
</configuration>
 
cs



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4. 로그를 수집할 클래스에 변수 선언
 
 
 
private static final Logger logger = LoggerFactory.getLogger(클래스이름.class);
 
 
 
private : 외부에서 로그를 가로채지 못하도록 하기 위해서
 
static final : 로그 내용이 바뀌지 않으므로
 
 
 
5. 로그를 수집할 method에서 로그 수집 명령어 호출 
 
 
 
logger.info("로그 타이틀",  출력할 값);
 
 
 
* 로그의 level
 
1. Debug : Debug, Info, Warn, Error 포함
 
2. Info : Info, Warn, Error 포함
 
3. Warn : Warn, Error 포함
 
4. Error : Error만 포함
 
 
 
<!-- logback 로깅 관련 -->
 
        <dependency>
 
            <groupId>org.slf4j</groupId>
 
            <artifactId>jcl-over-slf4j</artifactId>
 
            <version>1.7.21</version>
 
        </dependency>
 
        <dependency>
 
            <groupId>ch.qos.logback</groupId>
 
            <artifactId>logback-classic</artifactId>
 
            <version>1.1.7</version>
 
        </dependency>
        
        
        
        
        
        
        
@Controller // 
 
public class BoardController {
 
    // log fild
    private static final Logger Logger = LoggerFactory.getLogger(BoardController.class);
 
    
    
    @Inject
    BoardService boardService; // BoardServiceImpl�쓣 二쇱엯�떆�궡
 
    @RequestMapping("board/board_delete.do")
    public String board_delete(@RequestParam int idx) {
 
        boardService.boardDelete(idx);
        return "redirect:/board/board_list.do";
    }
 
    @RequestMapping("board/board_list.do")
    public String board_list(@RequestParam(defaultValue = "1"int curPage, Model model,
            @RequestParam(required = false, defaultValue = "username"String search_option,
            @RequestParam(required = false, defaultValue = ""String search) {
 
        /*
         * @RequestParam에 지정된 변수에 값이 넘어오지 않으면 400에러 발생 required=false 필수 입력항목이
         * 아님, 기본값은 required=true defaultValue= "기본값"
         */
 
        int count = boardService.boardCount(search_option, search);
 
        PageDAO pageDao = new PageDAO(count, curPage);
 
        int start = pageDao.getPageBegin();
        int end = pageDao.getPageEnd();
 
        List<BoardDTO> list = boardService.boardList(start, end, search_option, search);
 
        model.addAttribute("list", list);
 
        // 페이지 네비게이션 관련자료 저장
        model.addAttribute("page", pageDao);
 
        // 검색관련 정보 저장
        model.addAttribute("search_option", search_option);
        model.addAttribute("search", search);
 
        //log output
        Logger.info("pageinfo:" + pageDao);
 
        return "board/board_list";
 
    }
    
    
    
    
    
    
    -> if there is a problem ->maven -> updatemaven
    
    
    
    
    
cs




systemout.println() =====> loger


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package com.example.web03.aop;
 
import java.util.Arrays;
 
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
 
import com.example.web03.controller.board.BoardController;
 
//종단 관심 - 핵심적인 비즈니스 로직 join , buy,
//횡단관심(aspect) 공통적인 로직 (로그, 트랜젝션 등등)
// Advice - 횡단관심을 모든 코드에서 처리하지 않고 공통적으로 처리 할 수 있도록 지원하는 코드
 
@Component // 스프링에서 관리하는 빈
@Aspect // 스프링에서 관리하는 aop bean
 
public class LogAdvice {
    // 포인트컷 - before, after,실행 시점, around 실행 전후
    // 컨트롤러의 모든 method 실행 전후에 logPrint method가 호출됨
 
    // 로거 변수 만들기
    private static final Logger Logger = LoggerFactory.getLogger(LogAdvice.class);
 
    @Around("execution(* com.example.web03.controller..*Controller.*(..))"
            + " or execution(* com.example.web03.service..*Impl.*(..))"
            + " or execution(* com.example.web03.model..*Impl.*(..))")
    public Object logPrint(ProceedingJoinPoint joinPoint) throws Throwable {
 
        // 현재 시스템의 시간
        long startTime = System.currentTimeMillis();
 
        // 컨트롤러의 method가 실행됨
        Object result = joinPoint.proceed();
 
        // 클래스 이름
        String type = joinPoint.getSignature().getDeclaringTypeName();
        // method 이름
        String method = joinPoint.getSignature().getName();
        // 매개변수
        String args = Arrays.toString(joinPoint.getArgs());
 
        /*
         * System.out.println("클래스" + type); System.out.println("method" +
         * method); System.out.println("매개변수" + args);
         */
        // 로깅 툴을 이용한 로거 찍기
 
        Logger.info("클래스=" + type);
        Logger.info("method=" + method);
        Logger.info("매개변수=" + args);
 
        long endTime = System.currentTimeMillis();
 
        Logger.info("실행시간=" + (endTime - startTime));
        Logger.info("=================================================");
        /*
         * System.out.println("실행시간" + (endTime - startTime));
         * System.out.println(
         * "=================================================");
         */
        return result;
    }
}
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