1、把log4j2相关的jar包导入到WEB-INF的lib目录下
log4j-api-2.6.2.jar
log4j-core-2.6.2.jar
2、在src目录下添加log4j2的配置文件
(1)log4j2.xml配置文件,以下是一个把日志输出到控制台和保存在文件中的配置文件
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="MyApp">
<appenders>
<Console name="Console" target="SYSTEM_OUT">
<ThresholdFilter level="debug"/>
<PatternLayout pattern="%m%n"/>
</Console>
<File name="log" fileName="e:\\test1.log" append="true">
<ThresholdFilter level="error"/>
<PatternLayout pattern="%d-%m%n"/>
</File>
</appenders>
<loggers>
<root level="debug">
<appender-ref ref="Console"></appender-ref>
<appender-ref ref="log"></appender-ref>
</root>
</loggers>
</Configuration>
如果需要复杂一些的请参考:http://www.cnblogs.com/hanfight/p/5721855.html
(2)log4j2.properties配置文件,功能同上
status = warn
name = MyApp
filter.threshold.type = ThresholdFilter
filter.threshold.level = debug
appender.console.type = Console
appender.console.name = STDOUT
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = %m%n
appender.rolling.type = File
appender.rolling.name = log
appender.rolling.append = true
appender.rolling.fileName = e:\\test1.log
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = %d-%m%n
rootLogger.level = debug
rootLogger.appenderRef.stdout.ref = STDOUT
rootLogger.appenderRef.log.ref = log
如果需要复杂的请参考:
http://logging./log4j/2.x/manual/configuration.html#Properties
注:.properties这种方式用的比较少,链接中的注释也比较少,请参考(1)中的文档,对照着理解和编写。
3、输出log日志并记录成文件
//1.定义Logger对象,用Logger.getLogger(Class clazz):
public static Logger log4jDemo1 = LogManager.getLogger(LogListener.class.getName());
//2.定义Logger对象,用LogManager.getLogger(Class clazz):
//public static Logger log4jDemo2 = LogManager.getLogger(LogListener.class);
//3.定义Logger对象,用LogManager.getLogger(String name):
//public static Logger log4jDemo3 = LogManager.getLogger(LogListener.class.getName());
//4.定义Logger对象,将3中的name变成具体的字符串:
//public static Logger log4jDemo4 = LogManager.getLogger("common.LogListener");
log4jDemo1.debug("我是debug");
log4jDemo1.error("我是error");
log4jDemo1.log(Level.ERROR, "我是Level.ERROR ");
- 文件名log4j2.properties
- private static Logger log=(Logger) LogManager.getLogger(Loger4jlisentr.class.getName());
- public void attributeAdded(ServletContextAttributeEvent arg0) {
log.debug("添加了一个application属性!属性名称为="+arg0.getName()+"值为: "+arg0.getValue());
log.error("没有报错,这是测试!1234567890");
}
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