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
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...
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%
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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：
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public
CmsAutoSetup(CmsAutoSetupProperties props) {
m_props = props;
m_bean =
new
CmsSetupBean();
m_bean.init(props.getSetupWebappPath(), props.getServeltMapping(), props.getSetupDefaultWebappName());
}
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而CmsAutoSetupBean中定义了安装向导中的日志文件位置：
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/** 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;
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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：
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/**
* 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);
}
...
}
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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：
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# 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 ${opencms.set.logfile} to "false". In this case
# you must configure the log output file manually.
opencms.set.logfile=true
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所以我们明白，运行时的日志，都存在了$CATALINA_HOME/webapps/opencms/WEB-INF/logs目录下的opencms.log.
本文转自 charles_wang888 51CTO博客，原文链接：http://blog.51cto.com/supercharles888/1587167，如需转载请自行联系原作者
