java log4j配置

Log4j中有三个主要的组件，它们分别是 Logger、Appender和Layout。

Log4j 允许开发人员定义多个Logger，每个Logger拥有自己的名字，Logger之间通过名字来表明隶属关系。有一个Logger称为Root，它永远 存在，且不能通过名字检索或引用，可以通过Logger.getRootLogger()方法获得，其它Logger通过 Logger.getLogger(String name)方法。

Appender则是用来指明将所有的log信息存放到什么地方，Log4j中支持多种appender，如 console、files、GUI components、NT Event Loggers等，一个Logger可以拥有多个Appender，也就是你既可以将Log信息输出到屏幕，同时存储到一个文件中。

Layout的作用是控制Log信息的输出方式，也就是格式化输出的信息。

Log4j中将要输出的Log信息定义了5种级别，依次为DEBUG、INFO、WARN、ERROR和FATAL，当输出时，只有级别高过配置中规定的级别的信息才能真正的输出

 

log4j.xml

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
    <!--输出方式：输出到控制台 -->
    <appender name="myConsole" class="org.apache.log4j.ConsoleAppender">
        <!-- 设置通道名称和输出方式，其中输出方式appender有5种,分别为 
            org.apache.log4j.RollingFileAppender（按日志文件大小生成日志文件）
            org.apache.log4j.ConsoleAppender (控制台) 
            org.apache.log4j.FileAppender (文件) 
            org.apache.log4j.DailyRollingFileAppender (每天产生一个日志文件) 
            org.apache.log4j.WriterAppender (将日志信息以流格式发送到指定地方)
        -->
        <param name="Target" value="System.out" />
        <!-- <param name="Target" value="System.err" />-->

        <!-- Threshold是个全局的过滤器，他将把低于所设置的level的信息过滤不显示出来 -->
        <param name="Threshold" value="INFO" />
        
        <!-- 设置日志输出的格式 -->
        <layout class="org.apache.log4j.PatternLayout">
            <!-- 参数都以%开始后面不同的参数代表不同的格式化信息： %c 输出所属类的全名，可在修改为 %d{Num} ,Num类名输出的范围 如："org.apache.elathen.ClassName",%C{2}将输出elathen.ClassName 
                %d 输出日志时间其格式为 %d{yyyy-MM-dd HH:mm:ss,SSS}，可指定格式 如 %d{HH:mm:ss} %l 输出日志事件发生位置，包括类目名、发生线程，在代码中的行数 
                %n 换行符 %m 输出代码指定信息，如info(“message”),输出message %p 输出优先级，即 FATAL ,ERROR 等 %r 
                输出从启动到显示该log信息所耗费的毫秒数 %t 输出产生该日志事件的线程名 -->

            <!-- The default pattern: Date Priority [Category] Message\n -->
            <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n" />
        </layout>
    </appender>

    <!--输出方式是：每天一个日志文件 -->
    <!--设置通道名称是：file，输出方式DailyRollingFileAppender -->
    <appender name="myFile" class="org.apache.log4j.DailyRollingFileAppender">
        <!--日志文件路径和文件名称 -->
        <!-- ${catalina.base}是服务器根目录 -->
        <param name="File" value="${catalina.base}/outlogname.log" />

        <!-- 设置是否在重新启动服务时，在原有日志的基础添加新日志 -->
        <param name="Append" value="true" />

        <!-- Rollover at midnight each day -->
        <!-- e.g. mylog.log.2009-11-25.log -->
        <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />

        <!-- Rollover at the top of each hour <param name="DatePattern" value="'.'yyyy-MM-dd-HH'.log'"/> -->
        <layout class="org.apache.log4j.PatternLayout">
            <!-- The default pattern: Date Priority [Category] Message\n -->
            <param name="ConversionPattern" value="%d %-5p [%c] %m%n" />

            <!-- The full pattern: Date MS Priority [Category] (Thread:NDC) Message\n -->
            <!-- <param name="ConversionPattern" value="%d %-5r %-5p [%c] (%t:%x) %m%n"/> -->
        </layout>
    </appender>

    <appender name="ERROR_LOG" class="org.apache.log4j.DailyRollingFileAppender">
        <errorHandler class="org.apache.log4j.helpers.OnlyOnceErrorHandler" />
        <param name="File" value="error.log" />
        <param name="Append" value="true" />
        <!-- 指定日志输出级别 -->
        <param name="Threshold" value="INFO" />
        <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %-5p [%c] %m%n" />
        </layout>
    </appender>

    <!-- level:是日记记录的优先级，优先级由高到低分为 OFF ,FATAL ,ERROR ,WARN ,INFO ,DEBUG ,ALL。 
        Log4j建议只使用FATAL ,ERROR ,WARN ,INFO ,DEBUG这四个级别。 -->

    <!-- 指定logger的设置，additivity指示是否叠加输出log，如果是false， 在DsErrorLog logger中日志不会被其它logger满足条件的logger(比如root) 输出 -->
    <!-- 将名称为DSErrorLog的logger，输出到“EEROR_LOG”的appender 所谓logger的名字也就是，在定义Logger时，构造函数的参数 
        Logger log = Logger.getLogger("DSErrorLog"); -->
    <logger name="DSErrorLog" additivity="false">
        <level class="org.apache.log4j.Level" value="DEBUG" />
        <appender-ref ref="ERROR_LOG" />
    </logger>

    <!-- 输出指定类包中的日志，比如想输出 Hibernate运行中生成的SQL语句，可作如下设置 -->
    <category name="org.hibernate.SQL">
        <priority value="DEBUG" />
        <!-- 如果指定一个appender,这些log将被输出到指定的appender 如：<appender-ref ref="myFile"/> 
            否则将作用于所有的appender -->
    </category>

    <!-- 根默认会自动构建一个 root,输出INFO级别的日志到控制台，供logger继承 -->
    <root>
        <priority value="INFO" />
        <appender-ref ref="myConsole" />
        <appender-ref ref="myFile" />
    </root>
</log4j:configuration> 

web.xml

    <!-- log4j 系统日志-->
    <context-param> 
          <param-name>log4jConfigLocation</param-name> 
         <param-value>/WEB-INF/log4j.xml</param-value> 
    </context-param> 
    
    <listener> 
          <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> 
    </listener>

 

现在要在原有的项目上新增一个自定义级别：

首先定义一个Level要继承log4j的Level类，并设置日志的级别

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.net.SyslogAppender;

public class CustomLog {
    private static Logger logger = Logger.getLogger(CustomLog.class);

    private static class CustomLevel extends Level {
        private static final long serialVersionUID = 1076913470822079835L;

        private CustomLevel(int level, String name, int sysLogLevel) {
            super(level, name, sysLogLevel);
        }
    }

    public static final Level CUST_LOG_LEVEL = new CustomLevel(20050, "Custom",
            SyslogAppender.LOG_LOCAL0);

    public static void customLog(Logger logger,Object pm_objLogInfo) {
        logger.log(CUST_LOG_LEVEL, pm_objLogInfo);
    }

}

定义一个Filter

import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.LoggingEvent;

public class CustomLogFilter extends Filter {
    boolean acceptOnMatch = false;
    int levelMin;
    int levelMax;

    public int getLevelMin() {
        return levelMin;
    }

    public void setLevelMin(int levelMin) {
        this.levelMin = levelMin;
    }

    public int getLevelMax() {
        return levelMax;
    }

    public void setLevelMax(int levelMax) {
        this.levelMax = levelMax;
    }

    @Override
    public int decide(LoggingEvent lgEvent) {
        int inputLevel = lgEvent.getLevel().toInt();
        if (inputLevel >= levelMin && inputLevel <= levelMax) {
            return 0;
        }
        return -1;
    }
}

 

项目需要添加一个自定义等级的日志
由于原先用的properties文件，因为properties配置比较老旧不能支持filter这种的配置，所以删除改用XML文件：

# This is the configuring for logging displayed in the Application Server
log4j.rootCategory=INFO, stdout, R,A2

# Replace the line above if you want to put a log file into the directory 
# you start Tomcat from
# log4j.rootCategory=INFO, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout.ConversionPattern=%p %c{1}.%M(%L) | %m%n
# Pattern to output the caller's file name and line number.
#log4j.appender.stdout.layout.ConversionPattern=[slsint] %p [%t] %c{1}.%M(%L) | %m%n


log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=${catalina.base}/slsintout.log
#log4j.appender.R.File=/home/slsadmin/slsint-file/slsint_log/slsintout.log
log4j.appender.R.Threshold=INFO
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=LOG\:[%d{yyyy-MM-dd HH\:mm\:ss}] %5p %c{1}\:%L - %m%n

log4j.appender.A2=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A2.File=${catalina.base}/slsinterr.log
#log4j.appender.A2.File=/home/slsadmin/slsint-file/slsint_log/slsinterr.log
log4j.appender.A2.Threshold=ERROR
log4j.appender.A2.layout=org.apache.log4j.PatternLayout
log4j.appender.A2.layout.ConversionPattern=LOG\:[%d{yyyy-MM-dd HH\:mm\:ss}] %5p %c{1}\:%L - %m%n


# You can change this to be an absolute path or even an environment variable
# If you're using an environment variable, you will have to set JAVA_OPTS
# to contain this variables - for example in the catalina.sh or catalina.bat
# file

#log4j.appender.R.File=slsint.log

#log4j.appender.R.MaxFileSize=1000KB

# Don't keep a backup file
#log4j.appender.R.MaxBackupIndex=0

#log4j.appender.R.layout=org.apache.log4j.PatternLayout
#log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

# If programmed properly the most messages would be at DEBUG 
# and the least at FATAL.
log4j.logger.com.krm.dao=WARN
log4j.logger.com.krm.util=WARN
log4j.logger.com.krm=DEBUG
log4j.logger.com.krm.roubdableBalacnce=WARN

# Control logging for other open source packages
log4j.logger.com.opensymphony.oscache=ERROR
log4j.logger.net.sf.navigator=ERROR
log4j.logger.net.sf.acegisecurity=WARN
log4j.logger.net.sf.acegisecurity.intercept.event.LoggerListener=WARN
log4j.logger.org.apache.commons=ERROR
log4j.logger.org.apache.struts=WARN
log4j.logger.org.displaytag=ERROR
log4j.logger.org.springframework=WARN

# Don't show debug logs for WebTest
log4j.logger.com.canoo.webtest=WARN

# All hibernate log output of "info" level or higher goes to stdout.
# For more verbose logging, change the "info" to "debug" on the last line.
log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN
log4j.logger.org.hibernate=WARN

# Changing the log level to DEBUG will result in Hibernate generated
# SQL to be logged.
log4j.logger.org.hibernate.SQL=ERROR

# Changing the log level to DEBUG will result in the PreparedStatement
# bound variable values to be logged.
log4j.logger.org.hibernate.type=ERROR

#\u52a0\u5165\u6b64\u914d\u7f6e\u53ef\u4ee5\u770b\u5230\u9875\u9762\u8df3\u8f6c\u7684\u60c5\u51b5
log4j.logger.org.apache.struts.action.RequestProcessor=ERROR
 

新增的XML文件，需要下载一个"log4j.dtd"文件，在以下XML文件中会引用到：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
    <appender name="Custom" class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="${catalina.base}/slsininfo.log" />
        <param name="Append" value="true" />
        <param name="MaxFileSize" value="50MB" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                value="LOG\:[%d{yyyy-MM-dd HH\:mm\:ss}] %5p %c{1}\:%L - %m%n" />
        </layout>
        <filter class="com.krm.slsint.common.CustomLogFilter">
            <param name="LevelMin" value="20050" />
            <param name="LevelMax" value="20050" />
        </filter>
    </appender>

    <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
        <param name="target" value="System.out" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%p %c{1}.%M(%L) | %m%n" />
        </layout>
    </appender>

    <appender name="R" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${catalina.base}/slsintout.log" />
        <param name="Threshold" value="INFO" />
        <param name="Append" value="true" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                value="LOG\:[%d{yyyy-MM-dd HH\:mm\:ss}] %5p %c{1}\:%L - %m%n" />
        </layout>
    </appender>

    <appender name="A2" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${catalina.base}/slsinterr.log" />
        <param name="Threshold" value="ERROR" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                value="LOG\:[%d{yyyy-MM-dd HH\:mm\:ss}] %5p %c{1}\:%L - %m%n" />
        </layout>
    </appender>

    <logger name="com.krm.dao">
        <level value="WARN" />
    </logger>
    <logger name="com.krm.util">
        <level value="WARN" />
    </logger>
    <logger name="com.krm">
        <level value="DEBUG" />
    </logger>
    <logger name="com.krm.roubdableBalacnce">
        <level value="WARN" />
    </logger>

    <logger name="com.opensymphony.oscache">
        <level value="ERROR" />
    </logger>
    <logger name="net.sf.navigator">
        <level value="ERROR" />
    </logger>
    <logger name="net.sf.acegisecurity">
        <level value="WARN" />
    </logger>
    <logger name="net.sf.acegisecurity.intercept.event.LoggerListener">
        <level value="WARN" />
    </logger>
    <logger name="org.apache.commons">
        <level value="ERROR" />
    </logger>
    <logger name="org.apache.struts">
        <level value="WARN" />
    </logger>
    <logger name="org.displaytag">
        <level value="ERROR" />
    </logger>
    <logger name="org.springframework">
        <level value="WARN" />
    </logger>

    <logger name="com.canoo.webtest">
        <level value="WARN" />
    </logger>

    <logger name="org.hibernate.ps.PreparedStatementCache">
        <level value="WARN" />
    </logger>
    <logger name="org.hibernate">
        <level value="WARN" />
    </logger>

    <logger name="org.hibernate.type">
        <level value="ERROR" />
    </logger>
    <logger name="org.hibernate.sql" >
        <level value="ERROR" />
    </logger>

    <logger name="org.apache.struts.action.RequestProcessor">
        <level value="ERROR" />
    </logger>

    <root>
        <priority value="INFO" />
        <appender-ref ref="stdout" />
        <appender-ref ref="R" />
        <appender-ref ref="A2" />
        <appender-ref ref="Custom" />
    </root>
</log4j:configuration>  

　　在开发时用的Tomca中间件，所以日志相对路径写为${catalina.base}/

　　如果换成别的中间件需要改一下变量名：

　　如TongWeb下：${tongweb.root}/

　　在Windows环境下，可以使用Weblogic的环境变量：set JAVA_PROPERTIES=-Dplatform.home=%WL_HOME% -Dwls.home=%WLS_HOME% -Dweblogic.home=%WLS_HOME%

　　${platform.home}/ 或 ${wls.home}/

 

　　程序调用的时候：

 

Logger customloger = Logger.getLogger(LoginAction.class);  

CustomLog.customLog(customloger, "log content");