log4j配置日志

maven 配置

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.6.1</version>
        </dependency>
​
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.6.1</version>
        </dependency>
​
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>1.7.2</version>
        </dependency>

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%m%n" />
        </Console>
    </Appenders>
    <Loggers>
        <Root level="INFO">
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>

log4j.properties

#所有日志
log4j.rootLogger = DEBUG,stdout,file
​
log4j.logger.org.apache.ibatis=warn
log4j.logger.java.sql=warn
log4j.logger.org.springframework=warn
​
# Druid
log4j.logger.druid.sql=DEBUG
log4j.logger.druid.sql.DataSource=warn
log4j.logger.druid.sql.Connection=warn
log4j.logger.druid.sql.Statement=DEBUG
log4j.logger.druid.sql.ResultSet=warn
#设置包名的输出级别
log4j.logger.cn.wdq=DEBUG,wdq
​
#控制台输出
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.Threshold=DEBUG
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
#log4j.appender.stdout.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss}[ %p ]%m%n
​
#所有文件输出
log4j.appender.file = org.apache.log4j.FileAppender
#log4j.appender.file.File = ${webApp.root}/logs/allDEBUG.log
log4j.appender.file.File = src/main/java/logs/allDEBUG.log   // 注意这里是日志的文件目录，对应的需要修改
log4j.appender.file.Encoding=UTF-8
log4j.appender.file.name = fileLogDemo
log4j.appender.file.Threshold=INFO
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss}[ %p ]   %m%n
log4j.appender.file.append = true
​
#wdq下所有包的文件输出
log4j.appender.wdq = org.apache.log4j.FileAppender
#log4j.appender.wdq.File = ${webApp.root}/logs/package_wdq.log
log4j.appender.wdq.File = src/main/java/logs/package_wdq.log   // 注意这里是日志的文件目录，对应的需要修改
log4j.appender.wdq.Encoding=UTF-8
log4j.appender.wdq.name = fileLogDemo
log4j.appender.wdq.Threshold=INFO
log4j.appender.wdq.layout=org.apache.log4j.PatternLayout
log4j.appender.wdq.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss}[ %p ]%m%n
log4j.appender.wdq.append = true

测试代码

package logTest;
​
import org.apache.log4j.Logger;
import org.junit.Test;
​
​
public class LoggerTest {
    Logger logger= Logger.getLogger(LoggerTest.class);
    @Test
    public void printLogger(){
        logger.error("直接输出吧");
        logger.info("hello world ");
        try {
​
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}