初始化logback的變數
阿新 • • 發佈：2019-01-03
為了配置方便，我們將logback的相關變數引數放到配置檔案system.properties中。在tomcat容器啟動時，控制容器的載入順序，先載入properties檔案，再初始化logback。由於logback是通過StaticLoggerBinder中的靜態程式碼塊初始化，因此要在它之前載入配置檔案，需要研究tomncat初始化的順序。
下來看下tomcat啟動都做了什麼
十月 13, 2016 8:58:29 上午 org.apache.tomcat.util.digester.SetPropertiesRule begin 警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:ecf.meloans' did not find a matching property. 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Server version: Apache Tomcat/7.0.68 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Server built: Feb 8 2016 20:25:54 UTC 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Server number: 7.0.68.0 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: OS Name: Windows 7 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: OS Version: 6.1 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Architecture: amd64 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Java Home: D:\program files\Java\jdk1.8.0_101\jre 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: JVM Version: 1.8.0_101-b13 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: JVM Vendor: Oracle Corporation 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: CATALINA_BASE: D:\program files\jr-tomcat-7.0.68 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: CATALINA_HOME: D:\program files\jr-tomcat-7.0.68 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Command line argument: -Dmaven.multiModuleProjectDirectory=$M2_HOME 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Command line argument: -Dcatalina.base=D:\program files\jr-tomcat-7.0.68 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Command line argument: -Dcatalina.home=D:\program files\jr-tomcat-7.0.68 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Command line argument: -Dwtp.deploy=D:\program files\jr-tomcat-7.0.68\webapps 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Command line argument: -Djava.endorsed.dirs=D:\program files\jr-tomcat-7.0.68\endorsed 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log 資訊: Command line argument: -Dfile.encoding=UTF-8 十月 13, 2016 8:58:29 上午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent 資訊: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: D:\program files\Java\jdk1.8.0_101\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Imaging\;C:\Program Files (x86)\AMD\ATI.ACE\Core-Static;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\java\jdk1.7.0_60\bin;C:\Program Files\TortoiseSVN\bin;. 十月 13, 2016 8:58:29 上午 org.apache.coyote.AbstractProtocol init 資訊: Initializing ProtocolHandler ["http-bio-8080"] 十月 13, 2016 8:58:29 上午 org.apache.coyote.AbstractProtocol init 資訊: Initializing ProtocolHandler ["ajp-bio-8009"] 十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.Catalina load 資訊: Initialization processed in 662 ms 十月 13, 2016 8:58:29 上午 org.apache.catalina.core.StandardService startInternal 資訊: Starting service Catalina 十月 13, 2016 8:58:29 上午 org.apache.catalina.core.StandardEngine startInternal 資訊: Starting Servlet Engine: Apache Tomcat/7.0.68 十月 13, 2016 8:58:29 上午 org.apache.catalina.loader.WebappClassLoaderBase validateJarFile 資訊: validateJarFile(D:\program files\jr-tomcat-7.0.68\webapps\ecf.meloans\WEB-INF\lib\servlet-api-2.5.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/servlet/Servlet.class 十月 13, 2016 8:58:32 上午 org.apache.catalina.startup.TldConfig execute 資訊: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 十月 13, 2016 8:58:32 上午 org.apache.catalina.core.ApplicationContext log 資訊: Spring WebApplicationInitializers detected on classpath: [[email protected]] set system logging parameter :log.app.version = 0.0.1 set system logging parameter :log.dir = d:/wangzy25/log set system logging parameter :log.credit.accounting.level = ERROR set system logging parameter :log.credit.accounting.task.level = DEBUG set system logging parameter :log.app.env = development set system logging parameter :log.credit.accounting.dao.level = ERROR set system logging parameter :log.root.level = DEBUG set system logging parameter :log.app.name = credit.accounting set system logging parameter :log.system.name = com.midea.jr 十月 13, 2016 8:58:32 上午 org.apache.catalina.core.ApplicationContext log 資訊: Initializing Spring root WebApplicationContext log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. SLF4J: Class path contains multiple SLF4J bindings.
其中：
資訊: Starting service Catalina
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資訊: Spring WebApplicationInitializers detected on classpath: [[email protected]]
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資訊: Initializing Spring root WebApplicationContextSLF4J: Class path contains multiple SLF4J bindings.
表示了Catalina啟動-->WebApplicationInitializers-->WebApplicationContext-->SLF4J bindings
因此我們只要在SLF4J bindings之前載入配置檔案即可。
方案1、通過配置listener，將其放到logback之前
package com.midea.jr.ecf.meloans.listener;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import ch.qos.logback.ext.spring.web.WebLogbackConfigurer;
/**
* <p>Project:com.midea.jr.ecf <p>
* <p>Module:meloans.utils <p>
* <p>Description:載入系統配置檔案 system.properties <p>
*
* @author WANGZY25
* @date 2016年10月12日 下午3:03:54
*/
public class LoadSystemConfigListener implements ServletContextListener {
@Override
public void contextInitialized( ServletContextEvent sce ) {
Properties prop = new Properties();
InputStream in = this.getClass().getResourceAsStream( "/system.properties" );
System.out.println("*********** begin loading log configuration *********");
try {
prop.load(in);
Enumeration<Object> iter= prop.keys();
while(iter.hasMoreElements()){
String key = iter.nextElement().toString();
if(key.startsWith( "log" )){
System.setProperty( key, prop.getProperty( key ) );
System.out.println( "set system logging parameter : "+key+" = "+prop.getProperty( key ) );
}
}
} catch( IOException e ) {
e.printStackTrace();
}
WebLogbackConfigurer.initLogging(sce.getServletContext());
}
@Override
public void contextDestroyed( ServletContextEvent sce ) {
WebLogbackConfigurer.shutdownLogging(sce.getServletContext());
}
}
同時在web.xml中，把這個listener配置到靠前的位置
<listener>
<listener-class>com.midea.jr.ecf.meloans.utils.LoadSystemConfigListener</listener-class>
</listener>方案2、重寫WebApplicationInitializer
package com.midea.jr.ecf.meloans.listener;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import org.springframework.web.WebApplicationInitializer;
/**
* <p>Project:com.midea.jr.ecf <p>
* <p>Module:meloans.utils <p>
* <p>Description:載入系統配置檔案 system.properties <p>
*
* @author WANGZY25
* @date 2016年10月12日 下午3:03:54
*/
public class JrLogbackConfigLoader implements WebApplicationInitializer{
@Override
public void onStartup( ServletContext servletContext ) throws ServletException {
Properties prop = new Properties();
InputStream in = this.getClass().getResourceAsStream( "/system.properties" );
try {
prop.load(in);
Enumeration<Object> iter= prop.keys();
while(iter.hasMoreElements()){
String key = iter.nextElement().toString();
if(key.startsWith( "log" )){
System.setProperty( key, prop.getProperty( key ) );
System.out.println("set system logging parameter :"+key+" = "+prop.getProperty( key ));
}
}
} catch( IOException e ) {
e.printStackTrace();
}
}
}
參考地址：