ใช้งาน Log Back

1. maven dependencies

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.6.4</version>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.0.6</version>
</dependency>

2. ให้นำ configuration ต่อไปนี้ (logback.xml) ไปวางใน Other Sources หรือ Class Path

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    
    <property name="ROOT_PATH" value="/ServerLog" />
    
    
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{HH:mm:ss.SSS} %level [%thread] %logger{10} [%file:%line] %msg%n
            </Pattern>
        </layout>
    </appender>
    
    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>${ROOT_PATH}/logbackLearning.log</file>
        <encoder>
            <pattern>
                %d{HH:mm:ss.SSS} %level [%thread] %logger{10} [%file:%line] %msg%n           
            </pattern>
        </encoder>
    </appender>
  
    
    <logger name="com.blogspot.na5cent" level="TRACE"/>
    <root level="debug">
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="FILE"/>
    </root>
</configuration>

3. เขียน java code

package com.blogspot.na5cent.logbacklearning;

import java.io.Serializable;
import java.util.Date;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Redcrow
 */
@ManagedBean
@RequestScoped
public class LogbackTestingMB implements Serializable {
    private static final Logger LOG = LoggerFactory.getLogger(LogbackTestingMB.class);

    @PostConstruct
    public void postConstruct() {

        LOG.debug("start logger on {}", new Date());
    }

    public String getHelloWorld() {
        return "hello world!";
    }
}

log ออก console

log ออก file