java-错误log4j:WARN No appenders could be found for logger

使用环境:

1.IED工具 idea

2.系统环境win10

错误原因:

1.根本原因是日志问题

解决方式:

1.pom文件添加jar包

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.2</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.2</version>
</dependency>
2.引入log包

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

3.main方法中初始化
3.1加载配置文件
3.2初始化配置文件

PropertyConfigurator.configure("F:/IdeaProjects/test/src/main/log4j.properties");//加载.properties文件
Logger log=Logger.getLogger("org.zblog.test");
log.info("--------------测试");

说明:
import org.apache.log4j.xml.DOMConfigurator; 此包使用来加载xml格式配置文件

log4j.properties:
配置文件内容

### 设置日志级别及日志存储器 ###
#log4j.rootLogger=DEBUG, Console
### 设置日志级别及日志存储器 ###
log4j.rootLogger=info,consolePrint,errorFile,logFile
#log4j.rootLogger=DEBUG,consolePrint,errorFile,logFile,Console  

###  输出到控制台 ###
log4j.appender.consolePrint.Encoding = UTF-8
log4j.appender.consolePrint = org.apache.log4j.ConsoleAppender
log4j.appender.consolePrint.Target = System.out
log4j.appender.consolePrint.layout = org.apache.log4j.PatternLayout
log4j.appender.consolePrint.layout.ConversionPattern=%d %p [%c] - %m%n

### 输出到日志文件 ###
log4j.appender.logFile.Encoding = UTF-8
log4j.appender.logFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.logFile.File = F:/IdeaProjects/test/target/log/test.log
log4j.appender.logFile.Append = true
log4j.appender.logFile.Threshold = info
log4j.appender.logFile.layout = org.apache.log4j.PatternLayout
log4j.appender.logFile.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 保存异常信息到单独文件 ###
log4j.appender.errorFile.Encoding = UTF-8
log4j.appender.errorFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.errorFile.File = D:/RUN_Data/log/dajiangtai_error.log
log4j.appender.errorFile.Append = true
log4j.appender.errorFile.Threshold = ERROR
log4j.appender.errorFile.layout = org.apache.log4j.PatternLayout
log4j.appender.errorFile.layout.ConversionPattern =%-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n
  
#Console  
log4j.appender.Console=org.apache.log4j.ConsoleAppender  
log4j.appender.Console.layout=org.apache.log4j.PatternLayout  
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n  
  
log4j.logger.java.sql.ResultSet=INFO  
log4j.logger.org.apache=INFO  
log4j.logger.java.sql.Connection=DEBUG  
log4j.logger.java.sql.Statement=DEBUG  
log4j.logger.java.sql.PreparedStatement=DEBUG

#log4j.logger.com.dajiangtai.dao=DEBUG,TRACE  
log4j.logger.com.dajiangtai.dao.IFollowDao=DEBUG