初始化logback的变量
为了配置方便，我们将logback的相关变量参数放到配置文件system.properties中。在tomcat容器启动时，控制容器的加载顺序，先加载properties文件，再初始化logback。由于logback是通过StaticLoggerBinder中的静态代码块初始化，因此要在它之前加载配置文件，需要研究tomncat初始化的顺序。方案1、通过配置listener，将其放到logb
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为了配置方便，我们将logback的相关变量参数放到配置文件system.properties中。在tomcat容器启动时，控制容器的加载顺序，先加载properties文件，再初始化logback。由于logback是通过StaticLoggerBinder中的静态代码块初始化，因此要在它之前加载配置文件，需要研究tomncat初始化的顺序。
下来看下tomcat启动都做了什么
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
信息: Server version: Apache Tomcat/7.0.68
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server built: Feb 8 2016 20:25:54 UTC
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server number: 7.0.68.0
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Name: Windows 7
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Version: 6.1
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Architecture: amd64
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: 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
信息: JVM Version: 1.8.0_101-b13
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Vendor: Oracle Corporation
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: 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
信息: 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
信息: Command line argument: -Dmaven.multiModuleProjectDirectory=$M2_HOME
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: 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
信息: 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
信息: 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
信息: 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
信息: Command line argument: -Dfile.encoding=UTF-8
十月 13, 2016 8:58:29 上午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
信息: 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
信息: Initializing ProtocolHandler ["http-bio-8080"]
十月 13, 2016 8:58:29 上午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-bio-8009"]
十月 13, 2016 8:58:29 上午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 662 ms
十月 13, 2016 8:58:29 上午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
十月 13, 2016 8:58:29 上午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.68
十月 13, 2016 8:58:29 上午 org.apache.catalina.loader.WebappClassLoaderBase validateJarFile
信息: 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
信息: 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
信息: Spring WebApplicationInitializers detected on classpath: [com.midea.jr.ecf.meloans.utils.JrLogbackConfigLoader@11ed90a7]
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
信息: 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：
信息: Starting service Catalina
.
.
.
信息: Spring WebApplicationInitializers detected on classpath: [com.midea.jr.ecf.meloans.utils.JrLogbackConfigLoader@11ed90a7]
.
.
.
信息: Initializing Spring root WebApplicationContextSLF4J: Class path contains multiple SLF4J bindings.
表示了Catalina启动-->WebApplicationInitializers-->WebApplicationContext-->SLF4J bindings
因此我们只要在SLF4J bindings之前加载配置文件即可。
方案1、通过配置listener，将其放到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:加载系统配置文件 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());
}
}
同时在web.xml中，把这个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、重写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:加载系统配置文件 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();
}
}
}
参考地址：
Logback统一配置及环境变量加载问题
http://www.jianshu.com/p/39178af66aef【飞天奔月出品】剖析logback2:logback启动
http://feitianbenyue.iteye.com/blog/2205631
图解Tomcat类加载机制
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