使用idea开发普通java项目，使用maven管理依赖，使用slf4j和log4j的配置方案

1、首先加入依赖

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   <!– https://mvnrepository.com/artifact/org.slf4j/slf4j-api –>
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   <dependency>
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   <groupId>org.slf4j</groupId>
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   <artifactId>slf4j-api</artifactId>
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   <version>1.7.26</version>
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   </dependency>
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   <!– https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 –>
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   <dependency>
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   <groupId>org.slf4j</groupId>
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    <artifactId>slf4j-log4j12</artifactId>
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    <version>1.7.26</version>
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    </dependency>

注意scope的值，直接从mvn仓库复制过来的scope值是test，要把这个去了，否则只有测试的时候才会启用这俩依赖

2、接下来在src/main/resources目录下面创建log4j.properties配置文件，内容如下，具体格式可百度：

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   log4j.rootLogger = debug,stdout,D,E
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   log4j.appender.stdout = org.apache.log4j.ConsoleAppender
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   log4j.appender.stdout.Target = System.out
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   log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
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   log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
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   log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
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   log4j.appender.D.File = log.log
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    log4j.appender.D.Append = true
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    log4j.appender.D.Threshold = DEBUG
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    log4j.appender.D.layout = org.apache.log4j.PatternLayout
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    log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] – [ %p ] %m%n
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    log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
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    log4j.appender.E.File = error.log
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    log4j.appender.E.Append = true
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    log4j.appender.E.Threshold = ERROR
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    log4j.appender.E.layout = org.apache.log4j.PatternLayout
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    log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] – [ %p ] %m%n

3、在需要使用日志的地方引入如下代码

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   Logger logger = LoggerFactory.getLogger(MainGet.class);
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   logger.info(“具体日志内容”);