1. 如果要以Log4j取代原先Tomcat所使用之log mechanism
1.1將log4j-1.2.8.jar copy into TOMCAT HOME\common\lib
1.2 create one file log4j.properties and save it into TOMCAT HOME\common\classes
1.3如果沒有將log4j.properties copy into TOMCAT HOME\common\classes,則在啟動Tomcat時會出現
log4j:WARN No appenders could be found for logger (org.apache.commons.digester.Digester).
log4j:WARN Please initialize the log4j system properly.
2. 如果要以Log4j提供web application進行log
2.1將log4j-1.2.8.jar copy into web ap\WEB-INF\lib
2.2 create one file log4j.properties and save it into web ap\WEB-INF\classes(絕不可在其他目錄,即使是
此目錄之子目錄下亦不允許)
2.3如果沒有將log4j.properties copy into web ap\WEB-INF\classes,則在啟動Tomcat時會出現
log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
log4j:WARN Please initialize the log4j system properly.
3. 如果要將log寫入到一個檔案中,則在log4j.properties中之
log4j.appender.AFile.File=d:/logFile.logè一定要指定絕對路徑,且separator需為/
4. 如果web ap中所有的log要寫到同一個log file
log4j.properties
.java
log4j.rootLogger=INFO, admin
log4j.appender.admin=org.apache.log4j.FileAppender
log4j.appender.admin.File=d:/AnMeiLogAdmin.log
log4j.appender.admin.Append=false
log4j.appender.admin.layout=org.apache.log4j.PatternLayout
log4j.appender.admin.layout.ConversionPattern=%p %t %c - %m %n
…
static Logger logger = Logger.getLogger(AdminAction.class.getName());
…
logger.info("Admin log");
5. 如果web ap中每個class要寫到各自之log file
log4j.properties
.java
log4j.category.profile=INFO, profile
log4j.appender.profile=org.apache.log4j.FileAppender
log4j.appender.profile.File=d:/AnMeiLogProfile.log
log4j.appender.profile.Append=false
log4j.appender.profile.layout=org.apache.log4j.PatternLayout
log4j.appender.profile.layout.ConversionPattern=%p %t %c - %m %n
…
static Category logger = Category.getInstance("profile");
…
logger.info("Profile log");
6. 如果web ap中每個package要寫到各自之log file
log4j.properties
.java
log4j.logger.com.anmei.db=INFO, package
log4j.appender.package=org.apache.log4j.FileAppender
log4j.appender.package.File=d:/AnMeiLogPackage.log
log4j.appender.package.Append=false
log4j.appender.package.layout=org.apache.log4j.PatternLayout
log4j.appender.package.layout.ConversionPattern=%p %t %c - %m %n
…
static Logger logger = Logger.getLogger("com.anmei.db");
…
logger.info("Package log");