解決引用slf4j中Logger.info隻打印出文字沒有數據的問題

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slf4j Logger.info隻打印出文字沒有數據

引的是 slf4j 包

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
private static Logger logger = LoggerFactory.getLogger(TsfTest.class);
logger.info("打印參數：",map);

隻能打印出：

2019-06-14 17:52:07.246 [http-apr-8080-exec-10] INFO c.q.m.p.b.rest.test – 打印參數：

解決方案

在第一個參數中加入花括號{ }即可。

logger.info("打印參數：{}",map);

解決！

啟用設置org.slf4j.Logger打印並輸出日志

在resouces目錄下面新建logback.xml（此為Logback推薦目錄）

內容配置如下

logback 分為兩種設置：

1. 輸出到控制臺 STDOUT

2. 輸出到文件 FILE

pom.xml配置

<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>

logback.xml配置

下面的配置同時配置輸出到文件和輸出到控制臺

<?xml version="1.0" encoding="UTF-8" ?>
<configuration scan="true" scanPeriod="3 seconds">
    <!--設置日志輸出為控制臺-->
    <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>

    <!--設置日志輸出為文件-->
    <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>

程序調用

1.申明 logger 變量

private Logger logger = LoggerFactory.getLogger(LoginLogDao.class);

2.在程序中調用日志

logger.debug(INSERT_LOGIN_LOG_SQL);

官方介紹網址：https://logback.qos.ch/demo.html

下面為官網介紹

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.

輸出結果如下

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(?,?,?)]

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。

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