SL4J简介
SLF4J,即简单日志门面(Simple Logging Facade for Java),不是具体的日志解决方案,它只服务于各种各样的日志系统,也就是说它只是一个抽象层(abstract layer),它允许你在后台使用任意一个日志类库。如果你开发的是类库或者嵌入式组件,那么就应该考虑采用SLF4J,因为不可能影响最终用户选择哪种日志系统。在另一方面,如果是一个简单或者独立的应用,确定只有一种日志系统,那么就没有使用SLF4J的必要。
Pom配置
<properties> <slf4j-api.version>1.6.4</slf4j-api.version> <logback-classic.version>0.9.28</logback-classic.version> <jcl-over-slf4j.version>1.6.4</jcl-over-slf4j.version> </properties> <!-- 日志开始 --> <!-- 日志框架API --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j-api.version}</version> </dependency> <!-- 日志实现提供者 --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>${logback-classic.version}</version> <exclusions> <exclusion> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> </exclusion> </exclusions> <scope>runtime</scope> </dependency> <!-- 拦截 apache commons logging --> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>${jcl-over-slf4j.version}</version> <scope>runtime</scope> </dependency> <!-- 日志结束 -->
SL4J logback 基本配置
<?xml version="1.0" encoding="UTF-8"?> <configuration debug="true"> <!-- 应用名称 --> <property name="APP_NAME" value="chinesefactored_beta" /> <!--日志文件的保存路径,首先查找系统属性-Dlog.dir,如果存在就使用其;否则,在当前目录下创建名为logs目录做日志存放的目录 --> <property name="LOG_HOME" value="${log.dir:-logs}/${APP_NAME}" /> <!-- 日志输出格式 --> <property name="ENCODER_PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{80} - %msg%n" /> <contextName>${APP_NAME}</contextName> <!-- 控制台日志:输出全部日志到控制台 --> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"> <Pattern>${ENCODER_PATTERN}</Pattern> </encoder> </appender> <!-- 文件日志:输出全部日志到文件 --> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${LOG_HOME}/output.%d{yyyy-MM-dd}.log</fileNamePattern> <maxHistory>7</maxHistory> </rollingPolicy> <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"> <pattern>${ENCODER_PATTERN}</pattern> </encoder> </appender> <!-- 错误日志:用于将错误日志输出到独立文件 --> <appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${LOG_HOME}/error.%d{yyyy-MM-dd}.log</fileNamePattern> <maxHistory>7</maxHistory> </rollingPolicy> <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"> <pattern>${ENCODER_PATTERN}</pattern> </encoder> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>WARN</level> </filter> </appender> <!-- 独立输出的同步日志 --> <appender name="STARDJ_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${LOG_HOME}/sync.%d{yyyy-MM-dd}.log</fileNamePattern> <maxHistory>7</maxHistory> </rollingPolicy> <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"> <pattern>${ENCODER_PATTERN}</pattern> </encoder> </appender> <logger name="log.stardj" level="DEBUG" addtivity="true"> <appender-ref ref="STARDJ_FILE" /> </logger> <root> <level value="DEBUG" /> <appender-ref ref="STDOUT" /> <appender-ref ref="FILE" /> <appender-ref ref="ERROR_FILE" /> </root> </configuration>
测试代码
package com.stardj.qa.chinesefactored_beta; import org.junit.Test; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class log_test { // private final static Logger LOG = LoggerFactory.getLogger(log_test.class); private final static Logger LOG = LoggerFactory.getLogger("log.stardj"); @Test public void testLog(){ String str = "This is a test"; try { LOG.error("this is an error test."); LOG.info(str); System.out.println("OK."); } catch (Exception e) { e.printStackTrace(); } } }
时间: 2024-11-05 13:55:09