今天是：
带着程序的旅程，每一行代码都是你前进的一步，每个错误都是你成长的机会，最终，你将抵达你的目的地。
Java log 历史与使用
1. java log发展史
2.java log关系
3. java log 使用到的jar
4. 项目中使用
1.jul 使用
jul 打印控制台
public static void addLogToConsole(){
// 获取Logger对象
Logger logger = Logger.getLogger(LoggingExample.class.getName());
// 设置全局日志级别
logger.setLevel(Level.INFO);
// 创建控制台处理程序
ConsoleHandler consoleHandler = new ConsoleHandler();
// 设置控制台处理程序的级别
consoleHandler.setLevel(Level.INFO);
// 配置日志格式
consoleHandler.setFormatter(new java.util.logging.SimpleFormatter());
// 将处理程序添加到Logger
logger.addHandler(consoleHandler);
// 记录日志消息
logger.info("info to console");
}
jul 到文件
public static void addLogToFile() throws IOException {
Logger logger = Logger.getLogger(LoggingExample.class.getName());
FileHandler fileHandler = new FileHandler("F:\\logs\\jul\\jul.log");
// 将处理程序添加到Logger
logger.addHandler(fileHandler);
logger.info("logging to file jul.log");
}
jul 桥接到slf4j
需要的pom
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>2.0.7</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jul-to-slf4j</artifactId>
<version>2.0.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-simple -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>2.0.2</version>
</dependency>
public static void addLogBridgeToSlf4j() throws IOException {
Logger logger = Logger.getLogger(LoggingExample.class.getName());
SLF4JBridgeHandler fileHandler = new SLF4JBridgeHandler();
// 将处理程序添加到Logger
logger.addHandler(fileHandler);
logger.info("logging bridge to slf4j");
}
2.JCL
在获取Log对象的时候，会通过SPI方式对应的LogFactory,jcl-over-slf4j 中SLF4JLogFactory通过继承JCL中的LogFactory类来实现。
jcl打印到控制台
默认使用JUL 作为实现
private static Log logger = LogFactory.getLog(JCLExample.class);
public static void addLogToConsole(){
// 记录日志消息
logger.info("info to console");
}
jcl交接到log4j2
//pom.xml
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.7.36</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.19.0</version>
</dependency>
//log4j2.properties
status = warn
name= LogConfigDemo
# Log files location
property.basePath = F:/logs/jcl/
# Console appender name and pattern
appender.console.type = Console
appender.console.name = consoleLogger
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = [%-5level] %d{yyyy-MM-dd'T'HH:mm:ss.SSS} %c{1} - %msg%n
# RollingFileAppender name, pattern, path and rollover policy
appender.rolling.type = RollingFile
appender.rolling.name = fileLogger
appender.rolling.fileName= ${basePath}/jcl-slf4j.log
appender.rolling.filePattern= ${basePath}/app_%d{yyyyMMdd}.log.gz
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = %d{yyyy-MM-dd HH:mm:ss.SSS} %level [%t] [%l] - %msg%n
appender.rolling.policies.type = Policies
# RollingFileAppender rotation policy
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size = 10MB
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.delete.type = Delete
appender.rolling.strategy.delete.basePath = ${basePath}
appender.rolling.strategy.delete.maxDepth = 10
appender.rolling.strategy.delete.ifLastModified.type = IfLastModified
# Delete all files older than 30 days
appender.rolling.strategy.delete.ifLastModified.age = 30d
# Configure root logger
rootLogger.level = debug
rootLogger.appenderRef.stdout.ref = consoleLogger
rootLogger.appenderRef.rolling.ref = fileLogger
public static void addLogBridgeToSlf4j() throws IOException {
logger.debug("This is a DEBUG level log message.");
logger.info("This is an INFO level log message.");
logger.warn("This is a WARN level log message.");
logger.error("This is an ERROR level log message.");
}
3.log4j
log4j12
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.2</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
log4j2
pom.xml
注意 log4j-slf4j-impl 依赖的slf4j api 版本是1.x版本，log4j-slf4j2-impl 依赖的slf4j是2.x版本
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>2.0.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.20.0</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.20.0</version>
</dependency>
log4j2.xml
<configuration status="warn" monitorInterval="30">
<Properties>
<!-- 日志显示模板,显示内容的格式如下 -->
<!-- [21:55:33:047] [INFO] - org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:173) - Initializing Spring embedded WebApplicationContext -->
<Property name="log_pattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>
<!-- 保存日志文件目录 -->
<!--<Property name="file_path" value="${sys:user.home}"/>-->
<Property name="file_path" value="logs/link"/>
<!-- 日志文件的最大容量，超过该值就进行备份 -->
<Property name="file_max_size" value="30MB"/>
<!-- 备份的文件夹名称 如下为：2020-02 -->
<Property name="backup_folder" value="$${date:yyyy-MM}"/>
<!-- 备份文件的后缀，日志文件超过file_max_size会备份到filePattern指定的目录下 -->
<Property name="backup_file_suffix" value="-%d{yyyy-MM-dd}-%i.log"/>
</Properties>
<!--定义appender-->
<appenders>
<!--控制台的输出配置-->
<console name="Console" target="SYSTEM_OUT">
<!-- 设置控制台只输出INFO及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
<ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
<!--输出日志的格式-->
<PatternLayout pattern="${log_pattern}"/>
</console>
<!-- 所有的日志信息会打印到此文件中，append=false每次启动程序会自动清空 -->
<!-- <File name="all" fileName="${file_path}/all.log" append="true">
<PatternLayout pattern="${log_pattern}"/>
</File>-->
<!--
该RollingFile存储INFO级别的日志，
默认存储到 fileName 文件中
超过SizeBasedTriggeringPolicy的设定值，则存储到 filePattern 文件中
-->
<RollingFile name="RollingFileInfo" fileName="${file_path}/info.log"
filePattern="${file_path}/${backup_folder}/info${backup_file_suffix}">
<!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
<ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
<!-- 写入日志文件的模板 -->
<PatternLayout pattern="${log_pattern}"/>
<Policies>
<TimeBasedTriggeringPolicy/>
<SizeBasedTriggeringPolicy size="${file_max_size}"/>
</Policies>
<!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，超过该数量，会滚动删除前面的记录 -->
<DefaultRolloverStrategy max="20"/>
</RollingFile>
<RollingFile name="RollingFileWarn" fileName="${file_path}/warn.log"
filePattern="${file_path}/${backup_folder}/warn${backup_file_suffix}">
<ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout pattern="${log_pattern}"/>
<Policies>
<TimeBasedTriggeringPolicy/>
<SizeBasedTriggeringPolicy size="${file_max_size}"/>
</Policies>
</RollingFile>
<RollingFile name="RollingFileError" fileName="${file_path}/error.log"
filePattern="${file_path}/${backup_folder}/error${backup_file_suffix}">
<ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout pattern="${log_pattern}"/>
<Policies>
<TimeBasedTriggeringPolicy/>
<SizeBasedTriggeringPolicy size="${file_max_size}"/>
</Policies>
</RollingFile>
</appenders>
<!-- 只有定义了logger并使用appender-ref，appender才会生效 -->
<loggers>
<!--过滤掉spring和hibernate的一些无用的debug信息-->
<logger name="org.springframework" level="INFO"/>
<logger name="org.mybatis" level="INFO">
<!-- 添加如下设置，控制台会再打印一次 -->
<AppenderRef ref="Console"/>
</logger>
<root level="INFO">
<appender-ref ref="Console"/>
<appender-ref ref="RollingFileInfo"/>
<appender-ref ref="RollingFileWarn"/>
<appender-ref ref="RollingFileError"/>
</root>
</loggers>
</configuration>
3. logback
pom
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>2.0.7</version> <!-- 请根据需要选择版本 -->
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.4.11</version> <!-- 请根据需要选择版本 -->
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.4.11</version>
</dependency>
logback.xml
<configuration>
<property name="DEV_HOME" value="f:/logs/logback" />
<appender name="FILE-THREAD" class="ch.qos.logback.classic.sift.SiftingAppender">
<discriminator>
<key>logFileName</key>
<defaultValue>head0</defaultValue>
</discriminator>
<sift>
<appender name="FILE-${logFileName}"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${DEV_HOME}/${logFileName}.log</file>
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<Pattern>
%d{yyyy-MM-dd HH:mm:ss} [%thread] %level %logger{35} - %msg%n
</Pattern>
</encoder>
<rollingPolicy
class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<FileNamePattern>${DEV_HOME}/${logFileName}.%i.log.zip</FileNamePattern>
<MinIndex>1</MinIndex>
<MaxIndex>10</MaxIndex>
</rollingPolicy>
<triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>10MB</MaxFileSize>
</triggeringPolicy>
</appender>
</sift>
</appender>
//生成单个日志文件
<appender name="FILE-ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${HOME_LOG}</file>
<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
<fileNamePattern>logs/archived/app.%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
<!-- each archived file, size max 10MB -->
<maxFileSize>10MB</maxFileSize>
<!-- total size of all archive files, if total size > 20GB, it will delete old archived file -->
<totalSizeCap>20GB</totalSizeCap>
<!-- 60 days to keep -->
<maxHistory>60</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d %p %c{1.} [%t] %m%n</pattern>
</encoder>
</appender>
//异步记录日志
<appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender">
<appender-ref ref="FILE-ROLLING" />
</appender>
<root level="debug">
<appender-ref ref="ASYNC"/>
</root>
//控制台日志
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<layout class="ch.qos.logback.classic.PatternLayout">
<Pattern>
%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n
</Pattern>
</layout>
</appender>
<logger name="com.zlennon.log4j" level="debug"
additivity="false">
<appender-ref ref="FILE-THREAD" />
<appender-ref ref="CONSOLE" />
</logger>
<root level="error">
<appender-ref ref="FILE-THREAD" />
<appender-ref ref="CONSOLE" />
</root>
</configuration>
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