引入：
这篇文章主要快速的研究下opencms所采用的日志系统以及各自的log文件。
分析：
（1）安装opencms时的log
因为在opencms安装时候会自动调用$CATALINA_HOME/opencms/WEB-INF目录下的setup.bat(如果是UNIX机器则是setup.sh)
而这个执行脚本中，会配置真实执行的命令是
... rem Set standard command for invoking Java. set _RUNJAVA="%JAVA_HOME%\bin\java.exe" set MAINCLASS=org.opencms.setup.CmsAutoSetup ... rem execute OPENCMS %_RUNJAVA% %JAVA_OPTS% -classpath "%OPENCMS_HOME%\classes%CLASSPATH%%OPENCMS_CP%%TOMCAT_LIB%" %MAINCLASS% %CMD_LINE_ARGS%
所以，它其实会去执行CmsAutoSetup类，而这个执行向导(wizard)实际是通过CmsAutoSetupBean来完成的：
public CmsAutoSetup(CmsAutoSetupProperties props) {
m_props = props;
m_bean = new CmsSetupBean();
m_bean.init(props.getSetupWebappPath(), props.getServeltMapping(), props.getSetupDefaultWebappName());
}而CmsAutoSetupBean中定义了安装向导中的日志文件位置：
/** Location for log file. */ protected String m_logFile = CmsSystemInfo.FOLDER_WEBINF + CmsLog.FOLDER_LOGS + "setup.log"; /** Location for logs relative to the webapp folder. */ protected String m_logsFolder = CmsSystemInfo.FOLDER_WEBINF + CmsLog.FOLDER_LOGS;
可以看出这个m_logFile的位置是在 $CATALINA_HOME/webapps/opencms/WEB-INF/logs目录下的setup.log.
（2)运行时的Log
因为org.opencms.main.OpenCms类提供了Opencms系统的运行时，它的getLog()方法会调用CmsLog类的静态方法getLog()方法。我们查看了CmsLog类，可以发现它的静态初始块中有如下代码：
/**
* Initializes the OpenCms logger configuration.<p>
*/
static {
try {
// look for the log4j.properties that shipped with OpenCms
URL url = Loader.getResource("log4j.properties");
if (url != null) {
// found some log4j properties, let‘s see if these are the ones used by OpenCms
String path = CmsFileUtil.normalizePath(url, ‘/‘);
// in a default OpenCms configuration, the following path would point to the OpenCms "WEB-INF" folder
String webInfPath = CmsResource.getParentFolder(CmsResource.getFolderPath(path));
// check for the OpenCms configuration file
// check for the OpenCms tld file
String tldFilePath = webInfPath + CmsSystemInfo.FILE_TLD;
File tldFile = new File(tldFilePath);
if (tldFile.exists()) {
// assume this is a default OpenCms log configuration
CmsParameterConfiguration configuration = new CmsParameterConfiguration(path);
// check if OpenCms should set the log file environment variable
boolean setLogFile = configuration.getBoolean("opencms.set.logfile", false);
if (setLogFile) {
// set "opencms.log" variable
String logFilePath = CmsFileUtil.normalizePath(webInfPath + FOLDER_LOGS + FILE_LOG, ‘/‘);
File logFile = new File(logFilePath);
m_logFileRfsPath = logFile.getAbsolutePath();
m_logFileRfsFolder = CmsFileUtil.normalizePath(logFile.getParent() + ‘/‘, File.separatorChar);
System.setProperty("opencms.logfile", m_logFileRfsPath);
System.setProperty("opencms.logfolder", m_logFileRfsFolder);
// re-read the configuration with the new environment variable available
PropertyConfigurator.configure(path);
}
}
// can‘t localize this message since this would end in an endless logger init loop
INIT.info(". Log4j config file : " + path);
}
...
}这就说明，它会在配置文件log4j.properties中检查key为opencms.set.logfile对应的value,如果是true,则会把运行时的log文件设置在WEB-INF/logs目录下的opencms.log文件。
而log4j.properties中已经把这个开关设为true 了：
# OpenCms provides a special variable ${opencms.logfile} to the environment, which contains
# the log file path. The location of this file is calculated relative to this
# "log4j.properties" file on OpenCms startup. If this file is located in the folder "${classes}",
# then the log is written to "${classes}../logs/opencms.log".
# To disable this mechanism, you must set ${opencms.set.logfile} to "false". In this case
# you must configure the log output file manually.
opencms.set.logfile=true所以我们明白，运行时的日志，都存在了$CATALINA_HOME/webapps/opencms/WEB-INF/logs目录下的opencms.log.
本文出自 “平行线的凝聚” 博客，请务必保留此出处http://supercharles888.blog.51cto.com/609344/1587167
原文地址：http://supercharles888.blog.51cto.com/609344/1587167
