Java自学-Log4j log4j.xml

Log4j log4j.xml

步骤 1 : log4j.xml

除了使用log4j.properties，也可以使用xml格式进行配置。
在src目录下装备log4j.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration PUBLIC "-//log4j/log4j Configuration//EN" "log4j.dtd">
  
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
      
    <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
       <layout class="org.apache.log4j.PatternLayout">
          <param name="ConversionPattern" value="%d %-5p %c.%M:%L - %m%n"/>
       </layout>
    </appender>
   
    <!-- specify the logging level for loggers from other libraries -->
    <logger name="com.opensymphony">
        <level value="ERROR" />
    </logger>
  
    <logger name="org.apache">
         <level value="ERROR" />
    </logger>
    <logger name="org.hibernate">
         <level value="ERROR" />
    </logger>
    
   <!-- for all other loggers log only debug and above log messages -->
     <root>
        <priority value="ERROR"/>
        <appender-ref ref="STDOUT" />
     </root>
      
</log4j:configuration>

步骤 2 : 修改TestLog4j

使用log4j.xml作为配置文件，并运行

package log4j;
 
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
 
public class TestLog4j {
    static Logger logger = Logger.getLogger(TestLog4j.class);
    public static void main(String[] args) throws InterruptedException {
        PropertyConfigurator.configure("e:\\project\\log4j\\src\\log4j.xml");
        for (int i = 0; i < 5000; i++) {
            logger.trace("跟踪信息");
            logger.debug("调试信息");
            logger.info("输出信息");
            logger.warn("警告信息");
            logger.error("错误信息");
            logger.fatal("致命信息");
        }
    }
}