步骤1:log4j.xml步骤2:修改TestLog4j

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:projectlog4jsrclog4j.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");}}}
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