log4j日志文件 log4j.xml log4j.properties配置

1，导入log4j jar包;

2，配置log4j.xml或log4j.properties文件;

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">

<appender name="myConsole" class="org.apache.log4j.ConsoleAppender">

<param name="Target" value="System.out"/>
<param name="Threshold" value="INFO"/>

<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-->

<param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>
</layout>
</appender>

<appender name="myFile" class="org.apache.log4j.DailyRollingFileAppender">

<param name="File" value="F:/xxy/mylog.log"/>

<param name="Append" value="true"/>

<param name="DatePattern" value="'.'yyyy-MM-dd'.log'"/>

<param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>

</layout>
</appender>

<logger name="DSErrorLog" additivity="false">
<level class="org.apache.log4j.Level" value="DEBUG"/>
<appender-ref ref="ERROR_LOG"/>
</logger>

<category name="org.hibernate.SQL">
<priority value="DEBUG"/>

</category>

<root>
<priority value ="INFO"/>
<appender-ref ref="myConsole"/>
<appender-ref ref="myFile"/>
</root>
</log4j:configuration>

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3,测试代码;

public class LoggerTest {

static Logger log4j = Logger.getLogger(LoggerTest.class.getName());

public static void main(String args[]){

PropertyConfigurator.configure("rec/log4j.xml");

log4j.info("log4j.info");
log4j.warn("log4j.warning");
log4j.error("log4j.error");
log4j.debug("log4j.fatal");
}
}

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4,在web项目中使用;

利用web项目启动的时候去加载log4j.xml配置文件

在web.xml文件中

<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>log4j.xml</param-value>
</context-param>

<listener>
<listener-class>onlyfun.logger.Log4jConfigListener</listener-class>
</listener>

public class Log4jConfigListener implements ServletContextListener{
public static final String CONFIG_LOCATION_PARAM = "log4jConfigLocation";
public static final String XML_FILE_EXTENSION = ".xml";

public void contextDestroyed(ServletContextEvent event) {
LogManager.shutdown();
}

public void contextInitialized(ServletContextEvent event) {

String location = event.getServletContext().getInitParameter(CONFIG_LOCATION_PARAM);
if (location != null) {
if (!location.startsWith("/")) {
location = "/" + location;
}
location = event.getServletContext().getRealPath(location);

//如果是xml结尾就用DOM解析，否则就用properties解析
if (location.toLowerCase().endsWith(XML_FILE_EXTENSION)) {
DOMConfigurator.configure(location);
}else {
PropertyConfigurator.configure(location);
}
}
}
}

加载完毕...........................................................................................................................................

最后，可写个公共方法便于应用

public class Log4jUtil {

public static Logger getInfoLogger(){
return Logger.getLogger("INFO2222");
}

public static Logger getErrorLogger(){
return Logger.getLogger("ERROR_LOG");
}

}

在别的类中可用以下得到：

Log4jUtil.getInfoLogger().info("--------massage---------");

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log4j日志文件 log4j.xml log4j.properties配置

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