log4j tutorial

Key Words: Log copy Log4j-1.2.9.jar to/web-inf/lib directory It's no use adding Log4j-1.2.9.jar references in Eclipse's Java builder path Under the copy Log4j-1.2.9.jar to/web-inf/lib TomcatYou need to automatically find the lib below this directory at startup, and the Eclipse reference is used in development use and, in the absence of a release, TomcatThes

=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n log4j.appender.R=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.R.File=D:\\Tomcat 5.5\\logs\\qc.loglog4j.appender.R.layout=org.apache.log4j.PatternLayout1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%nlog4j.logger.com.neusoft=DEBUGlog4j.logger.com.opensymphony.oscache=ERRORlog4j.logger.net.sf.navigator=

To be perfected:(1). Here is an introduction to log4j more detailed blog, a cursory look at the next time to look deeper, write a more in-depth introduction, the first link recorded here:Log4j Detailed IntroductionThe log about log4j has been confused. Here is a summary summary:(2) log4j has a lot of bugs, such as deadlock. Now there are logback and log4j2. I'll

When the project is on-line, the runtime often also has an exception, in the exception throws, want to get feedback immediately. So you need to configure the log4j send email function.The original version of log4j used in the project is 1.2.9, but this version does not support the authentication function of the mail service, so the latest version 1.2.14 is downloaded again to view the source codeThis versio

Reprint, original website: http://blog.csdn.net/wud_jiyanhui/article/details/6213443The concept and function of system logAs an application service, the log system plays an important role in tracking debugging, program state record, and recovery of crash data .Common Java Log SystemLog4jOne of the earliest Java log frameworks, launched by the Apache Foundation, provides a flexible and powerful logging mechanism.JDK1.4 LoggingframeworkFollowing log4j

1.1 Preparation work One, Tomcat has been properly configured and used. Second, software download: log4j------Http://www.apache.org/dist/jakarta/log4j/jakarta-log4j-1.2.8.zip 1.2. log4j Introduction In emphasizing reusable component development today, in addition to developing a reusable log operation class from be

LOG4J Component Composition The log4j is composed of three important components: 1. Priority of log information (Logger) 2. Output Destination of log information (Appender) 3. The output format of the log information (Layout). Profile: The priority of log information from high to low has error, WARN, INFO, DEBUG, respectively, to specify the importance of this log information; The output destination

Log4j configuration is commonly used. Two methods are generally used:. properties AND. xml. The following two simple examples are provided:1. log4j. properties ### Set org. level INFO, DEBUG, WARN, ERROR, and output location A1, A2 # log4j.category.org. zblog = ERROR, A1log4j.category.org. zblog = INFO, A2log4j. appender. a1 = org. apache. log4j. consoleAppender

1. Basic Configuration # The simplicity of log4j configuration makes it more and more widely used # The log4j configuration file outputs to the console, files, rollback files, send log emails, and output to the database log tables, custom tags, and other functions. # Generally, log files or databases are usually output. In this example, output files are used. # we recommend that you use only four levels of

1 Overview This document is a guide to using the LOG4J logging tool. Includes: Log introduction, logging tool Introduction, LOG4J basic usage, advanced use of log4j, integration of spring and log4j, etc. And an example is illustrated. This document is intended for all Java developers. 2nd Blog Introduction A file th

Log4j. properties Configuration: Log4j. rootlogger = info, root, file, JDBC Log4j. appender. Root = org. Apache. log4j. leleappenderLog4j. appender. Root. layout = org. Apache. log4j. patternlayoutLog4j. appender. root. layout. conversionpattern = %-5 p % d {yyyy-mm-dd hh:

The log4j configuration file is described in the preceding article, and today describes how to use log4j in a common Javaweb project.In the daily development process, the log is used very frequently, we can use the log to track the program errors, program runtime output parameters, etc., in many cases may use SYSTEM.OUT.PRINTLN () This method, but there is a more concise way, that is, using the log framewor

Write in front In project development, logging error logs has the following benefits: Easy Commissioning Easy to find errors during system operation Store business data for post-analysis purposes In Java, there are many ways to log logs: Own implementation Write your own class, log data to IO operation, write data to a text file, a database. Using log4j LOG4J