Maven项目搭建Log4J的运行环境，控制日志信息的输送

（1）Log4J是Apache为我们提供的一个强有力的日志操作包，导包

    <!-- log4j的包 -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>

（2）在src/main/resources目录创建log4j.properties

log4j.rootLogger = debug,stdout,D,E

log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log 
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

（3）在src/test/java下创建test包，再创建Test1进行测试

package test;

import org.apache.log4j.Logger;
import org.junit.Test;
public class Test1 {
    private static Logger log = Logger.getLogger(Test1.class.getClass());
    @Test
    public void testLog(){
        log.debug("debug");
        log.error("error");
    }
    }

（4）结果

（5）遇到问题：import org.apache.log4j.Logger;报错

原因：原来是我之前关闭了Build Automatically，导致log4j-1.2.17没有加载到Maven Dependencies中，也就不在项目所依赖的Libraries中

解决：Project----给Build Automatically打对勾

（6）分析log4j.properties

别人的链接：https://www.cnblogs.com/gaishishengzhu/articles/1735441.html

我的分析：待续