比較全的log4j示例

<?xml version="1.0" encoding="UTF-8"?>

<configuration status="off">

    <!--先定義所有的appender -->
    <appenders>
        <!--這個輸出控制檯的配置 -->
        <Console name="Console" target="SYSTEM_OUT">
            <!--這個都知道是輸出日誌的格式 -->
            <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n%ex" />
            
            <!--控制檯只輸出level及以上級別的資訊（onMatch），其他的直接拒絕（onMismatch） -->
            <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY" />
        </Console>

        <RollingFile name="RollingFile" fileName="/log/CFDMS.log" filePattern="/log/CFDMS.%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n%ex" charset="UTF-8" />
            <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY" />
            <Policies>
                <!-- 每天一個檔案 -->
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                
                <!-- 儲存365天的記錄 -->
                <DefaultRolloverStrategy max="365" />
            </Policies>
        </RollingFile>
        
        <RollingFile name="RollingFileSuccess" fileName="/log/CFDMSSuccess.log" filePattern="/log/CFDMSSuccess.%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n%ex" charset="UTF-8" />
            <Filters>
                <!-- 顯示error級別之外的資訊 -->
                <ThresholdFilter level="error" onMatch="DENY" onMismatch="NEUTRAL"/>
                <ThresholdFilter level="trace" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
            <Policies>
                <!-- 每天一個檔案 -->
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                
                <!-- 儲存365天的記錄 -->
                <DefaultRolloverStrategy max="365" />
            </Policies>
        </RollingFile>
        
        <RollingFile name="RollingFileError" fileName="/log/CFDMSError.log" filePattern="/log/CFDMSError.%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%file:%line] - %msg%n%ex" charset="UTF-8" />
            <Filters>
                <!-- 只顯示error級別的資訊 -->
                <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            </Filters>
            <Policies>
                <!-- 每天一個檔案 -->
                <TimeBasedTriggeringPolicy interval="1" modulate="true" />
                
                <!-- 儲存365天的記錄 -->
                <DefaultRolloverStrategy max="365" />
            </Policies>
        </RollingFile>
        
        <!-- 自定義一個log檔案在程式中直接使用 -->
        <RollingFile name="liuyxlog" fileName="/log/liuyx.log" append="true"  
                             filePattern="/log/liuyx$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">  
            <PatternLayout pattern="%d{yyyy-MM-dd 'at' HH:mm:ss z} %-5level %class{36} %L %M - %msg%xEx%n"/>  
            <SizeBasedTriggeringPolicy size="4 MB"/>  
        </RollingFile>
    </appenders>
    
    <!--然後定義logger，只有定義了logger並引入的appender，appender才會生效 -->
    <loggers>
        <!-- 3rdparty Loggers -->  
        <logger name="org.springframework.core" level="warn">  
        </logger>  
        <logger name="org.springframework.beans" level="warn">  
        </logger>  
        <logger name="org.springframework.context" level="warn">  
        </logger>  
        <logger name="org.springframework.web" level="warn">  
        </logger>  
        <logger name="org.jboss.netty" level="warn">  
        </logger>  
        <logger name="org.apache.http" level="warn">  
        </logger>  
        <logger name="com.mchange.v2" level="warn">  
        </logger>
        <!-- 自定義一個log檔案在程式中直接使用 -->
        <logger name="liuyxlogger" additivity="TRUE" level="ALL">  
            <appender-ref ref="liuyxlog" level="ALL" />  
        </logger>
        <!--建立一個預設的root的logger -->
        <root level="info">
            <appender-ref ref="RollingFile" />
            <appender-ref ref="RollingFileSuccess" />
            <appender-ref ref="RollingFileError" />
            <appender-ref ref="Console" />
        </root>
    </loggers>
</configuration>

 

package com.inspur;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class WhereIsMyLogFile {
    private static Logger logger = LogManager.getLogger("liuyxlogger"); 
    private static Logger logger2 = LogManager.getLogger(WhereIsMyLogFile.class); 
    public static void main(String[] args) {
        logger.trace("hello liuyx log");
        logger2.info("from logger2");
        logger2.error("im an error");
    }
}

 

輸出結果

 

 

 

如果想輸出到tomcat根目錄下，可以在路徑前加上${sys:catalina.home}