Log4j 配置和使用

1、maven 依赖

<!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

2、log4j.properties 配置

#log4j.path=/Users/tinybye/Documents/log4j/
log4j.path=H://test/
### 设置 ###
#log4j.rootLogger = [level] , appenderName1, appenderName2,blablabla...
log4j.rootLogger=info,stdout,DDD,EEE
#log4j.rootLogger=info,stdout

### 输出信息到控制台 ###
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

### 输出DEBUG 级别以上的日志到=/Users/tinybye/Documents/log4j/debug.log ###
log4j.appender.DDD=org.apache.log4j.DailyRollingFileAppender
log4j.appender.DDD.File=H://test/debug.log
log4j.appender.DDD.Append=true
log4j.appender.DDD.Threshold=DEBUG
log4j.appender.DDD.layout=org.apache.log4j.PatternLayout
log4j.appender.DDD.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

### 输出ERROR 级别以上的日志到=/Users/tinybye/Documents/log4j/error.log ###
log4j.appender.EEE=org.apache.log4j.DailyRollingFileAppender
log4j.appender.EEE.File=H://test/error.log
log4j.appender.EEE.Append=true
log4j.appender.EEE.Threshold=ERROR
log4j.appender.EEE.layout=org.apache.log4j.PatternLayout
log4j.appender.EEE.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

3、使用

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
 * <p> project: </p>
 * <p> Title: ${TITLE} </p>
 * <p>Description: ${DESCRIPTION} </p>
 * <p>Copyright: Copyright (c)  </p>
 * <p>Company:  </p>
 * <p>Created by liangxs on 2018-07-05 11:44.</p>
 *
 * @version 1.0
 */
public class DBTest {
    private static Logger log = Logger.getLogger(DBTest.class);
    public static MySQLDBUtil dbUtil = null;
        public static void main(String[] args) {
            PropertyConfigurator.configure(ClassLoader.getSystemResource("log4j.properties"));
            log.info("info");
            log.debug("debug");
            log.error("error");
            log.info("info");
 
        }
}

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