log4j配置每天生成一个日志文件

朱雀 2020-10-18 07:13 1144阅读 0赞

首先需要配置web.xml里面:

<servlet-name>log4j-init</servlet-name>
        <servlet-class>com.free.core.util.Log4j</servlet-class>
        <init-param>
          <param-name>log4j</param-name>
          <param-value>/WEB-INF/classes/logxml/log4j.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>

之后需要写一个实现类

package com.free.core.util;
    
    import java.io.File;
    import javax.servlet.http.HttpServlet;
    import org.apache.log4j.xml.DOMConfigurator;
    public class Log4j extends HttpServlet { 
        private static final long serialVersionUID = -4046002537330149394L;
    
        public void init() {
            String path = this.getServletContext().getRealPath("/");
            String file = this.getInitParameter("log4j");
            String log4jPath = path + file;
            System.setProperty("home", path);
            DOMConfigurator.configure(log4jPath);
        }
    
    }

logxml/log4j.xml配置如下：

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
    <log4j:configuration>
    
    
        <appender name="log_roll" class="org.apache.log4j.RollingFileAppender">
            
            <param name="File" value="${home}/logs/SystemOut.log" />
            <param name="datePattern" value="'.'yyyy-MM-dd" />
            
            <param name="Append" value="false" />
            
            <param name="MaxFileSize" value="2000KB" />
            
            <param name="MaxBackupIndex" value="10" />
            
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="[%p] [%d{yyyy-MM-dd HH:mm:ss}] [ Class = %C | Method = %M | Line = %L ] | MSG = %m |%n" />
            </layout>
            <filter class="org.apache.log4j.varia.LevelRangeFilter"> 
                <param name="LevelMax" value="WARN" /> 
                <param name="LevelMin" value="TRACE" /> 
            </filter> 
        </appender>
        <appender name="log_roll_error" class="org.apache.log4j.RollingFileAppender">
            
            <param name="File" value="${home}/logs/SystemErr.log" />
            <param name="datePattern" value="'.'yyyy-MM-dd" />
            
            <param name="Append" value="true" />
            
            <param name="MaxFileSize" value="2000KB" />
            
            <param name="MaxBackupIndex" value="10" />
            
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="[%p] [%d{yyyy-MM-dd HH:mm:ss}] [ Class = %C | Method = %M | Line = %L ] | MSG = %m |%n" />
            </layout>
            <filter class="org.apache.log4j.varia.LevelRangeFilter"> 
                <param name="LevelMax" value="WARN" /> 
                <param name="LevelMin" value="TRACE" /> 
            </filter> 
        </appender>
        
        <appender name="log_daily" class="org.apache.log4j.DailyRollingFileAppender">
            <param name="File" value="${home}/logs/SystemOut.log" />
            <param name="datePattern" value="'.'yyyy-MM-dd" />
            <param name="Append" value="true" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="[%p] [%d{yyyy-MM-dd HH:mm:ss}] [ Class = %C | Method = %M | Line = %L ] | MSG = %m |%n" />
            </layout>
            <filter class="org.apache.log4j.varia.LevelRangeFilter"> 
                <param name="LevelMax" value="WARN" /> 
                <param name="LevelMin" value="TRACE" /> 
            </filter> 
        </appender>
        <appender name="log_daily_error" class="org.apache.log4j.DailyRollingFileAppender">
            <param name="File" value="${home}/logs/SystemErr.log" />
            <param name="datePattern" value="'.'yyyy-MM-dd" />
            <param name="Append" value="true" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="[%p] [%d{yyyy-MM-dd HH:mm:ss}] [ Class = %C | Method = %M | Line = %L ] | MSG = %m |%n" />
            </layout>
            <filter class="org.apache.log4j.varia.LevelRangeFilter"> 
                <param name="LevelMin" value="ERROR" /> 
            </filter> 
        </appender>
        
    
        <appender name="runlog" class="org.apache.log4j.ConsoleAppender">
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="[%d{dd/MM/yy hh:mm:ss:sss z}] %5p %c{2}: %m%n" />
            </layout>
        </appender>
    
        <root>
            <level value="info" />
            <appender-ref ref="runlog" />
            <appender-ref ref="log_daily" />
            <appender-ref ref="log_daily_error" />
        </root>
    </log4j:configuration>

即可在项目目录下每天生成一个日志文件