这篇文章主要介绍“怎么解决引用slf4j中Logger.info没有数据的问题”,在日常操作中,相信很多人在怎么解决引用slf4j中Logger.info没有数据的问题问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”怎么解决引用slf4j中Logger.info没有数据的问题”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
引的是 slf4j 包
import org.slf4j.Logger; import org.slf4j.LoggerFactory; private static Logger logger = LoggerFactory.getLogger(TsfTest.class); logger.info("打印参数:",map);
只能打印出:
2019-06-14 17:52:07.246 [http-apr-8080-exec-10] INFO c.q.m.p.b.rest.test - 打印参数:
在第一个参数中加入花括号{ }即可。
logger.info("打印参数:{}",map);
解决!
在resouces目录下面新建logback.xml(此为Logback推荐目录)
内容配置如下
logback 分为两种设置:
1. 输出到控制台 STDOUT
2. 输出到文件 FILE
<properties> <slf4j.version>1.7.25</slf4j.version> </properties> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.25</version> </dependency>
下面的配置同时配置输出到文件和输出到控制台
<?xml version="1.0" encoding="UTF-8" ?> <configuration scan="true" scanPeriod="3 seconds"> <!--设置日志输出为控制台--> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%X{userId}] [%X{requestId}] %logger - %msg%n</pattern> </encoder> </appender> <!--设置日志输出为文件--> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <File>logFile.log</File> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <FileNamePattern>logFile.%d{yyyy-MM-dd_HH-mm}.log.zip</FileNamePattern> </rollingPolicy> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern>%d{HH:mm:ss,SSS} [%thread] %-5level %logger{32} - %msg%n</Pattern> </layout> </appender> <root> <level value="DEBUG"/> <appender-ref ref="STDOUT"/> <appender-ref ref="FILE"/> </root> </configuration>
1.申明 logger 变量
private Logger logger = LoggerFactory.getLogger(LoginLogDao.class);
2.在程序中调用日志
logger.debug(INSERT_LOGIN_LOG_SQL);
官方介绍网址:https://logback.qos.ch/demo.html
下面为官网介绍
logback-classic with two appenders: a ConsoleAppender and a RollingFileAppender. The RollingFileAppender sends logging events to a file called logFile.log and will rollover the active file every minute. The old file will be renamed and compressed to a zip file. The ConsoleAppender will output the logging requests to the console, and shorten the logger names to gain space on the console window, without loss of legibility. For example, ch.qos.logback.demo.prime.NumberCruncherImpl will be abbreviated as c.q.l.d.prime.NumberCruncherImpl.
输出结果如下
isDebugEnabled true
2017-04-23 23:58:35,502 DEBUG [http-nio-8080-exec-6] (LoginLogDao.java:32) - INSERT INTO t_login_log(user_id,ip,login_datetime) VALUES(?,?,?)
2017-04-23 23:58:35,503 DEBUG [http-nio-8080-exec-6] (JdbcTemplate.java:869) - Executing prepared SQL update
2017-04-23 23:58:35,503 DEBUG [http-nio-8080-exec-6] (JdbcTemplate.java:616) - Executing prepared SQL statement [INSERT INTO t_login_log(user_id,ip,login_datetime) VALUES(?,?,?)]
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