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3分鐘配完log4j

第一步：先定義一個簡單的log4j工廠類，很簡單，直接繼承Logger

import org.apache.log4j.Logger;

import org.apache.log4j.PropertyConfigurator;

/**

* 自定義的Logger工廠類，繼承自Logger

*

* @author 見習和尚

* @since 2010

* @version v1.0

*/

public class LogFactory extends Logger{

/**

* 靜態塊---初始化log4j配置文件

*/

static {

//log4j配置文件路徑

PropertyConfigurator.configure("D:\\workspace\\LogWeb\\src\\log4j.properties");

}

/**

* 重載的構造方法

* @param name

*/

protected LogFactory(String name) {

super(name);

}

第二步：在classpath下創建并配置log4j配置文件，配置文件如下（注釋已經寫的很清楚了）：
log4j.properties配置文件如下，可直接copy使用

## defined log level;log to Console and to file and to DB

log4j.rootCategory=DEBUG, stdout , R ,DATABASE

## printout log to Console

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

## log format

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

## Console log format

## log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n

log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd hh:mm:ss} | [%t] (%F:%L) | %m%n

## defined each day create a new logfile

log4j.appender.R=org.apache.log4j.DailyRollingFileAppender

## '.'yyyy-MM: each month

## '.'yyyy-ww: each week

## '.'yyyy-MM-dd: each day

## '.'yyyy-MM-dd-a: two files one day

## '.'yyyy-MM-dd-HH: per hours

## '.'yyyy-MM-dd-HH-mm: per minites

log4j.appender.R.DatePattern='.'yyyy-MM-dd-HH-mm

## defined logfile path

log4j.appender.R.File=D\:\\Program Files\\apache-tomcat-6.0.28\\logs\\gc.log

log4j.appender.R.layout=org.apache.log4j.PatternLayout

## %d means date time; %t means which method;

## %F means file;%c means class name; %L means which line;

## %m means message which we want to print; %n means "\r\n" in windows and "\n" in unix

## %p means print log level; %d{yyyy-MM-dd hh:mm:ss} means print "yyyy-MM-dd hh:mm:ss" date

log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd hh:mm:ss} | [%t] (%F:%L) | %m%n

# in database

log4j.appender.DATABASE.BufferSize=10

log4j.appender.DATABASE=org.apache.log4j.jdbc.JDBCAppender

log4j.appender.DATABASE.URL=jdbc\:mysql\://localhost\:3306/test

log4j.appender.DATABASE.driver=com.mysql.jdbc.Driver

log4j.appender.DATABASE.user=root

log4j.appender.DATABASE.password=password

log4j.appender.DATABASE.sql=INSERT INTO Log4j(message) VALUES ('[framework] %d{yyyy-MM-dd hh\:mm\:ss} | [%t] (%F\:%L) | %m%n')

log4j.appender.DATABASE.layout=org.apache.log4j.PatternLayout

log4j.logger.com.neusoft=DEBUG

log4j.logger.com.opensymphony.oscache=ERROR

log4j.logger.net.sf.navigator=ERROR

log4j.logger.org.apache.commons=ERROR

log4j.logger.org.apache.struts=WARN

log4j.logger.org.displaytag=ERROR

log4j.logger.org.springframework=DEBUG

log4j.logger.com.ibatis.db=WARN

log4j.logger.org.apache.velocity=FATAL

log4j.logger.com.canoo.webtest=WARN

log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN

log4j.logger.org.hibernate=DEBUG

log4j.logger.org.logicalcobwebs=WARN

第三部：在代碼中使用log4j，樣例如下：

import org.apache.log4j.Logger;

import org.apache.log4j.Priority;

import com.sys.common.util.log.LogFactory;

public class TestLog4j {

static Logger logger = LogFactory.getLogger(TestLog4j.class.getName());

public TestLog4j() {

}

public static void main(String[] args) {

logger.debug("Start of the main() in TestLog4j");

logger.info("Just testing a log message with priority set to INFO");

logger.warn("Just testing a log message with priority set to WARN");

logger.error("Just testing a log message with priority set to ERROR");

logger.fatal("Just testing a log message with priority set to FATAL");

logger.log(Priority.WARN, "Testing a log message use a alternate form");

}

OK！在java application應用中這樣配置就結束了。樣例支持三種輸出：1、控制臺 2、文件 3、數據庫

另外：如果要在web中使用log4j。只需額外定義一個log4j加載類并配置web.xml即可。加載類如下：

import org.apache.log4j.PropertyConfigurator;

import javax.servlet.http.HttpServlet;

public class Log4jInit extends HttpServlet {

public void init() {

String prefix = getServletContext().getRealPath("/");

String file = getInitParameter("log4j");

if (file != null) {

PropertyConfigurator.configure(prefix + file);

}

web.xml中增量配置如下：

<servlet-name>log4j</servlet-name>

<servlet-class>com.apache.jakarta.log4j.Log4jInit</servlet-class>

<init-param>

<param-name>log4j</param-name>

<param-value>/WEB-INF/log4j.properties</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

好了，配置完畢。接下來就是用了。。。

posted on 2010-10-17 19:39 見習和尚閱讀(400) 評論(0) 編輯收藏

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