import org.apache.log4j.Logger;
AccpTeacher teacher=new AccpTeacher();
Logger logger=Logger.getLogger(AccpTeacherLog4j.class.getName());
try{
logger.debug("请正确设置教员的编号。");
teacher.setId("088");
}catch(IllegalArgumentException ex){
logger.info(ex.getMessage());
}
报这个错误
log4j:WARN No appenders could be found for logger (s2Java.sg.ch04.AccpTeacherLog4j).
log4j:WARN Please initialize the log4j system properly.
AccpTeacher teacher=new AccpTeacher();
Logger logger=Logger.getLogger(AccpTeacherLog4j.class.getName());
try{
logger.debug("请正确设置教员的编号。");
teacher.setId("088");
}catch(IllegalArgumentException ex){
logger.info(ex.getMessage());
}
报这个错误
log4j:WARN No appenders could be found for logger (s2Java.sg.ch04.AccpTeacherLog4j).
log4j:WARN Please initialize the log4j system properly.
不影响运行
log4j.rootLogger = INFO, clog4j.appender.c = org.apache.log4j.ConsoleAppender
log4j.appender.c.layout = org.apache.log4j.PatternLayout
log4j.appender.c.layout.conversionPattern = %p %d [%m]-[%c]%n
<?xml version="1.0" encoding="GBK" ?><!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"><log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"
threshold="debug"> <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<param name="Target" value="System.out" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%t] [%c{1}] %m%n" />
</layout>
</appender>
<appender name="ASYNC_CONSOLE" class="org.apache.log4j.AsyncAppender">
<param name="BufferSize" value="8192"/>
<appender-ref ref="CONSOLE" />
</appender> <appender name="FILE" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="~/x/log/server.log" />
<param name="Append" value="true" />
<param name="DatePattern" value="'.'yyyy-MM-dd" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%t] [%c{1}] %m%n" />
</layout>
</appender> <root>
<level value="INFO" />
<appender-ref ref="CONSOLE" />
</root>
</log4j:configuration>你还可以把 log4j.jar 中在 org\apache\log4j\xml 里有个 log4j.dtd 文件,把这个文件拖出来放到 log4j.xml 一样地方的话,那在 eclipse 就可以有提示了,呵呵。