Use bundle in Karaf to introduce the external log4j configuration file

Environment preparation:

1. Create a Config and logs folder under karaf_home

2. Copy mylog4j. properties to the config directory.

View log4j-1.2.17.jar/manifest. MF

Manifest-Version: 1.0Export-Package: org.apache.log4j.net;uses:="org.apache.log4j,org.apach e.log4j.spi,javax.naming,org.apache.log4j.helpers,javax.jms,org.apach e.log4j.xml,javax.mail,javax.mail.internet,org.w3c.dom,javax.jmdns";v ersion="1.2.17",org.apache.log4j.jmx;uses:="org.apache.log4j,javax.ma nagement,org.apache.log4j.helpers,org.apache.log4j.spi";version="1.2. 17",org.apache.log4j.jdbc;uses:="org.apache.log4j,org.apache.log4j.sp i";version="1.2.17",org.apache.log4j.config;uses:="org.apache.log4j.h elpers,org.apache.log4j,org.apache.log4j.spi";version="1.2.17",org.ap ache.log4j.helpers;uses:="org.apache.log4j,org.apache.log4j.spi,org.a pache.log4j.pattern";version="1.2.17",org.apache.log4j;uses:="org.apa che.log4j.spi,org.apache.log4j.helpers,org.apache.log4j.pattern,org.a pache.log4j.or,org.apache.log4j.config";version="1.2.17",org.apache.l og4j.or.jms;uses:="org.apache.log4j.helpers,javax.jms,org.apache.log4 j.or";version="1.2.17",org.apache.log4j.nt;uses:="org.apache.log4j.he lpers,org.apache.log4j,org.apache.log4j.spi";version="1.2.17",org.apa che.log4j.or.sax;uses:="org.apache.log4j.or,org.xml.sax";version="1.2 .17",org.apache.log4j.pattern;uses:="org.apache.log4j.helpers,org.apa che.log4j.spi,org.apache.log4j,org.apache.log4j.or";version="1.2.17", org.apache.log4j.spi;uses:="org.apache.log4j,org.apache.log4j.helpers ,org.apache.log4j.or";version="1.2.17",org.apache.log4j.rewrite;uses: ="org.apache.log4j,org.apache.log4j.spi,org.apache.log4j.helpers,org. apache.log4j.xml,org.w3c.dom";version="1.2.17",org.apache.log4j.or;us es:="org.apache.log4j.helpers,org.apache.log4j.spi,org.apache.log4j"; version="1.2.17",org.apache.log4j.xml;uses:="javax.xml.parsers,org.w3 c.dom,org.xml.sax,org.apache.log4j.config,org.apache.log4j.helpers,or g.apache.log4j,org.apache.log4j.spi,org.apache.log4j.or";version="1.2 .17",org.apache.log4j.varia;uses:="org.apache.log4j.spi,org.apache.lo g4j,org.apache.log4j.helpers";version="1.2.17"Ignore-Package: com.sun.jdmk.comm,javax.swing.text,javax.swing.border, javax.swing.tree,javax.swing,com.ibm.uvm.tools,javax.swing.table,java x.swing.eventBuilt-By: cyTool: Bnd-0.0.357Bundle-Name: Apache Log4jCreated-By: Apache Maven Bundle PluginBundle-Vendor: Apache Software FoundationBuild-Jdk: 1.6.0_23Bundle-Version: 1.2.17Bnd-LastModified: 1336302107501Bundle-ManifestVersion: 2Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txtBundle-Description: Apache Log4j 1.2Bundle-DocURL: http://logging.apache.org/log4j/1.2Bundle-SymbolicName: log4jImport-Package: javax.jmdns;resolution:=optional,javax.jms;resolution: =optional,javax.mail;resolution:=optional,javax.mail.internet;resolut ion:=optional,javax.management,javax.naming,javax.xml.parsers,org.w3c .dom,org.xml.sax,org.xml.sax.helpersName: org.apache.log4jDynamicImport-Package: *Implementation-Vendor: "Apache Software Foundation"Implementation-Title: log4jImplementation-Version: 1.2.17

We can see that the log4j-1.2.17.jar is a bundle.

Hot log4j deployment

Start Karaf and copy the log4j-1.2.17.jar to the karaf_home/deploy directory

Enter the LIST command to check that the bundle has been successfully installed.

Mylog4j. Properties

### direct log messages to stdout ###log4j.appender.consoleout=org.apache.log4j.ConsoleAppenderlog4j.appender.consoleout.layout=org.apache.log4j.PatternLayoutlog4j.appender.consoleout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c:%L - %m%n### direct messages to file myfile.log ###log4j.appender.myfile=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.myfile.File=logs/myfile.loglog4j.appender.myfile.DatePattern='.'yyyy-MM-ddlog4j.appender.myfile.layout=org.apache.log4j.PatternLayoutlog4j.appender.myfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c:%L - %m%nlog4j.rootLogger==info,consoleout,myfile

Pom. xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.demo.hello.provider</groupId><artifactId>log-test</artifactId><version>0.0.1-SNAPSHOT</version><packaging>bundle</packaging><name>log-test</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.10</version><scope>test</scope></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><dependency><groupId>org.osgi</groupId><artifactId>org.osgi.core</artifactId><version>4.2.0</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.felix</groupId><artifactId>maven-bundle-plugin</artifactId><extensions>true</extensions><configuration><instructions><Import-Package>org.apache.log4j,org.osgi.framework.*</Import-Package><Bundle-Activator>com.demo.hello.provider.Activator</Bundle-Activator></instructions></configuration></plugin></plugins></build></project>

Activitor

/**  *  * @author wumingkun * @version 1.0.0 * @Description */package com.demo.hello.provider;import org.apache.log4j.Logger;import org.osgi.framework.BundleActivator;import org.osgi.framework.BundleContext;import com.demo.hello.provider.log.LoggerFactory;/** * @author wumingkun * */public class Activator implements BundleActivator {/* (non-Javadoc) * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext) */public void start(BundleContext context) throws Exception {Logger logger =LoggerFactory.getLogger(Activator.class);logger.info("bundle start...");}/* (non-Javadoc) * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext) */public void stop(BundleContext context) throws Exception {}}

Loggerfactory:

/***** @ Author wumingkun * @ version 1.0.0 * @ description log factory class */package COM. demo. hello. provider. log; import Java. io. file; import Org. apache. log4j. logger; import Org. apache. log4j. propertyconfigurator;/*** @ author wumingkun **/public class loggerfactory {public static final string config_dir = "Config"; public static final string log4j_config = "mylog4j. properties "; Private Static string filename = getfilename (); public static logger getlogger (class clazz) {logger = logger. getlogger (clazz); loadproperty (); Return logger;} Private Static string getfilename () {return system. getproperty ("user. dir ") + file. separator + config_dir + file. separator + log4j_config;} public static void loadproperty () {propertyconfigurator. configure (filename );}}

Deploy log-test

You can see in the Karaf command line, as shown in:

You can see the log file named myfile. Log in karaf_home/logs.