SpringBoot study notes thirteen: logging framework of learning springBoot

1. SpringBoot study notes thirteen: logging framework springBoot learning

1.1. Common logging framework

1. slf4j,log4j,logback,common-logging等
2. logback is modified based log4j basis, can not be used alone, with the recommended SLF4j logback used, the current is divided into three modules: logback-core, logback-classic and logback-access; wherein logback-core is the basis for the other two modules modules .
3. logback core object

logger: Logger

Appender: Specify the log output destination, the destination can be a console, file

Layout: layout, formatting the log output log.

4. Level log: Debug <INFO <WARN <ERROR
5. log4j.properties log transfer logback.xml, support properties turn into logback.xml

log4j.properties log transfer logback.xml

6. The default log content logback

1, log creation date

2, log level

3, processId: process id

4, delimiter

5, thread name

6, the output of the log class

7, log information

1.2. SpringBoot2.x comes logBack log

1. Creating logback-spring.xml configuration file in the resource folder inside
2. The log4j.properties turn into logback.xml

<?xml version="1.0" encoding="UTF-8" ?>
<configuration>

    <appender name="consoleApp" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout"><!-- 配置布局 -->
            <pattern><!-- 输出日志的匹配，包含正则匹配 -->
                %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
            </pattern>
        </layout>
    </appender>

    <appender name="fileInfoApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter"><!-- 过滤器，只保存info级别的日志 -->
            <level>ERROR</level><!-- Error级别 -->
            <onMatch>DENY</onMatch><!-- deny，不进行记录 -->
            <onMismatch>ACCEPT</onMismatch>
        </filter>
        <encoder><!-- 与Layout一样，日志输出布局配置 -->
            <pattern>
                %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
            </pattern>
        </encoder>
        <!-- 滚动策略，根据时间日期滚动的 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 路径 -->
            <fileNamePattern>app_log/log/app.info.%d.log</fileNamePattern>
        </rollingPolicy>
    </appender>

    <appender name="fileErrorApp" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level><!-- 不写其他表示只接受error级别配置 -->
        </filter>
        <encoder>
            <pattern>
                %date{yyyy-MM-dd HH:mm:ss.SSS} %-5level[%thread]%logger{56}.%method:%L -%msg%n
            </pattern>
        </encoder>

        <!-- 设置滚动策略 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- 路径 -->
            <fileNamePattern>app_log/log/app.err.%d.log</fileNamePattern>

            <!-- 控制保留的归档文件的最大数量，超出数量就删除旧文件，假设设置每个月滚动，
            且<maxHistory> 是1，则只保存最近1个月的文件，删除之前的旧文件 -->
            <MaxHistory>1</MaxHistory>

        </rollingPolicy>
    </appender>
    <root level="INFO">  <!-- 控制日志输出级别 -->
        <appender-ref ref="consoleApp"/>	<!-- 这个输出到控制台consoleApp的appender级别中去 -->
        <appender-ref ref="fileInfoApp"/><!-- 输出到文件，并且以滚动的格式，根据天、或者小时进行滚动 -->
        <appender-ref ref="fileErrorApp"/>
    </root>
</configuration>

3. Interface test log

private Logger logger=LoggerFactory.getLogger(this.getClass());
@GetMapping("log")
	public Object testlog() {
		logger.debug("this is debug");
		logger.info("this is info");
		logger.warn("this is warn");
		logger.error("this is error");
		return JsonData.buildSuccess();
	}

4. Note that the imported package

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;