Log4j按级别输出日志到不同的文件
spring中对log的使用：
private static final Log logger = LogFactory.getLog(ContextLoader.class);
private static final String DEFAULT_STRATEGIES_PATH = "ContextLoader.properties";
private static final Properties defaultStrategies;
可见：static final中的大写只针对String类型，代表字符串常量，其他类型则一般不用大写。
写法1：方便继承：protected ， 不用写类名：
this
.getClass().getName()
- protected Logger logger = LoggerFactory.getLogger(this.getClass().getName());
方法2：在构造函数中初始化
- protected static Logger logger;
- CaseToSourcePanamaMojo(){
- logger = LoggerFactory.getLogger(getClass().getName());
- }
例子：无配置文件
- Logger logger = Logger.getLogger(Log4jSample.class);
- BasicConfigurator.configure();
- logger.setLevel(Level.INFO);
- logger.debug("debug msg.");
- logger.info("info msg.");
- logger.warn("warn msg.");
- logger.error("error msg.");
- logger.fatal("fatal msg.");
Log4j按级别输出日志到不同的文件
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<? xml version ="1.0" encoding ="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <!-- #log4j中有5级logger ,#FATAL 0 ,#ERROR 3 ,#WARN 4 ,#INFO 6 ,#DEBUG 7 --> < log4j:configuration xmlns:log4j ='http://jakarta.apache.org/log4j/' > <!-- 输出到控制台--> <!-- <appender name="LOG.Console" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" /> </layout> </appender> --> <!-- 将级别为DEBUG的信息输出到控制台--> < appender name ="LOG.DEBUG" class ="org.apache.log4j.RollingFileAppender" > < param name ="File" value ="debug.log" /> < param name ="MaxFileSize" value ="5120KB" /> < param name ="MaxBackupIndex" value ="10" /> < layout class ="org.apache.log4j.PatternLayout" > < param name ="ConversionPattern" value ="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" /> </ layout > < filter class ="org.apache.log4j.varia.LevelRangeFilter" > < param name ="LevelMin" value ="DEBUG" /> < param name ="LevelMax" value ="DEBUG" /> </ filter > </ appender > <!-- 将级别为INFO的信息输出到控制台--> < appender name ="LOG.INFO" class ="org.apache.log4j.RollingFileAppender" > < param name ="File" value ="info.log" /> < param name ="MaxFileSize" value ="5120KB" /> < param name ="MaxBackupIndex" value ="10" /> < layout class ="org.apache.log4j.PatternLayout" > < param name ="ConversionPattern" value ="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" /> </ layout > < filter class ="org.apache.log4j.varia.LevelRangeFilter" > < param name ="LevelMin" value ="INFO" /> < param name ="LevelMax" value ="INFO" /> </ filter > </ appender > <!-- 将级别为WARN的信息输出到控制台--> < appender name ="LOG.WARN" class ="org.apache.log4j.RollingFileAppender" > < param name ="File" value ="warn.log" /> < param name ="MaxFileSize" value ="5120KB" /> < param name ="MaxBackupIndex" value ="10" /> < layout class ="org.apache.log4j.PatternLayout" > < param name ="ConversionPattern" value ="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" /> </ layout > < filter class ="org.apache.log4j.varia.LevelRangeFilter" > < param name ="LevelMin" value ="WARN" /> < param name ="LevelMax" value ="WARN" /> </ filter > </ appender > <!-- 将级别为ERROR的信息输出到控制台--> < appender name ="LOG.ERROR" class ="org.apache.log4j.RollingFileAppender" > < param name ="File" value ="error.log" /> < param name ="MaxFileSize" value ="5120KB" /> < param name ="MaxBackupIndex" value ="10" /> < layout class ="org.apache.log4j.PatternLayout" > < param name ="ConversionPattern" value ="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" /> </ layout > < filter class ="org.apache.log4j.varia.LevelRangeFilter" > < param name ="LevelMin" value ="ERROR" /> < param name ="LevelMax" value ="ERROR" /> </ filter > </ appender > <!-- 将级别为FATAL的信息输出到控制台--> < appender name ="LOG.FATAL" class ="org.apache.log4j.RollingFileAppender" > < param name ="File" value ="fatal.log" /> < param name ="MaxFileSize" value ="5120KB" /> < param name ="MaxBackupIndex" value ="10" /> < layout class ="org.apache.log4j.PatternLayout" > < param name ="ConversionPattern" value ="%d{yyy-MM-dd HH:mm:ss} [%-5p] %c {%F:%L} - %m%n" /> </ layout > < filter class ="org.apache.log4j.varia.LevelRangeFilter" > < param name ="LevelMin" value ="FATAL" /> < param name ="LevelMax" value ="FATAL" /> </ filter > </ appender > <!-- <appender name="InitAction" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="d:/dbcon.log"/> <param name="MaxFileSize" value="5120KB"/> <param name="MaxFileSize" value="10" /> <param name="MaxBackupIndex" value="2" /> <param name="DatePattern" value="'.'yyyy-MM-dd'.'log"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyy-MM-dd HH:mm:ss} - %m%n"/> <param name="ConversionPattern" value="%d{DATE} [%-5p] %c {%F:%L} - %m%n"/> </layout> </appender> --> <!-- 设置org.logicalcobwebs包的输出级别为INFO--> <!-- <category name="org.logicalcobwebs"> <priority value="INFO" /> <appender-ref ref="LOG.Console" /> </category> --> < root > < priority value ="DEBUG" /> <!-- <appender-ref ref="LOG.Console" /> --> < appender-ref ref ="LOG.DEBUG" /> < appender-ref ref ="LOG.INFO" /> < appender-ref ref ="LOG.WARN" /> < appender-ref ref ="LOG.ERROR" /> < appender-ref ref ="LOG.FATAL" /> </ root > </ log4j:configuration >
import junit.framework.Test;
import org.apache.log4j.Level; import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator; import org.apache.log4j.xml.DOMConfigurator; public class Simpandfile { static Logger logger = Logger.getLogger(Test.class);
public static void main(String args[])
{ // 以property方式读到配置文件。 //PropertyConfigurator.configure("simple.properties"); DOMConfigurator.configure("xmllog4jconfig.xml"); logger.debug("Here is some DEBUG"); logger.info("Here is some INFO"); logger.warn("Here is some WARN"); logger.error("Here is some ERROR"); logger.fatal("Here is some FATAL"); } } |
| ============================================================================= 1、输出类的相对路径，而不是全部长度 <param name="ConversionPattern" value="%d [%X{requestURIWithQueryString}] %-5p %c{2} - %m%n" /> 2、ibatis输出sql
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