log4j初体验

Log4j是用Java编写的日志工具类，易用，且不会减慢系统运行速度。

下载地址：http://logging.apache.org/log4j/1.2/download.html

安装和其它第三方组件一样

 

log4j.properties

log4j.rootLogger=DEBUG,CONSOLE,DATABASE,FILE
log4j.addivity.org.apache=true

# 应用于控制台
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.Encoding=GBK
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

# 用于数据库
log4j.appender.DATABASE=org.apache.log4j.jdbc.JDBCAppender
log4j.appender.DATABASE.URL=jdbc:oracle:thin:@192.168.0.103:1521:ORCL
log4j.appender.DATABASE.driver=oracle.jdbc.driver.OracleDriver
log4j.appender.DATABASE.user=Nation
log4j.appender.DATABASE.password=1
log4j.appender.CONSOLE.Threshold=WARN
log4j.appender.DATABASE.sql=INSERT INTO LOG4J(stamp,thread, infolevel,class,messages) VALUES ('%d{yyyy-MM-dd HH:mm:ss}', '%t', '%p', '%l', '%m')
# INSERT INTO LOG4J (Message) VALUES ('[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n')
# 写入数据库中的表LOG4J的Message字段中，内容％d（日期）%c: 日志信息所在地（类名）%p: 日志信息级别%m: 产生的日志具体信息 %n: 输出日志信息换行
log4j.appender.DATABASE.layout=org.apache.log4j.PatternLayout
log4j.appender.DATABASE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

# 每天新建日志
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File=C:/log4j/log
log4j.appender.A1.Encoding=GBK
log4j.appender.A1.Threshold=DEBUG
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L : %m%n

#应用于文件
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=C:/log4j/file.log
log4j.appender.FILE.Append=false
log4j.appender.FILE.Encoding=GBK
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

# 应用于文件回滚
log4j.appender.ROLLING_FILE=org.apache.log4j.RollingFileAppender
log4j.appender.ROLLING_FILE.Threshold=ERROR
log4j.appender.ROLLING_FILE.File=rolling.log
log4j.appender.ROLLING_FILE.Append=true
log4j.appender.CONSOLE_FILE.Encoding=GBK
log4j.appender.ROLLING_FILE.MaxFileSize=10KB
log4j.appender.ROLLING_FILE.MaxBackupIndex=1
log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.ROLLING_FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

#自定义Appender
log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender
log4j.appender.im.host = mail.cybercorlin.net
log4j.appender.im.username = username
log4j.appender.im.password = password
log4j.appender.im.recipient = [e-mail]
log4j.appender.im.layout=org.apache.log4j.PatternLayout
log4j.appender.im.layout.ConversionPattern =[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

#应用于socket
log4j.appender.SOCKET=org.apache.log4j.RollingFileAppender
log4j.appender.SOCKET.RemoteHost=localhost
log4j.appender.SOCKET.Port=5001
log4j.appender.SOCKET.LocationInfo=true
# Set up for Log Facter 5
log4j.appender.SOCKET.layout=org.apache.log4j.PatternLayout
log4j.appender.SOCET.layout.ConversionPattern=[start]%d{DATE}[DATE]%n%p[PRIORITY]%n%x[NDC]%n%t[THREAD]%n%c[CATEGORY]%n%m[MESSAGE]%n%n
# Log Factor 5 Appender
log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender
log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000

# 发送日志给邮件
log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender
log4j.appender.MAIL.Threshold=FATAL
log4j.appender.MAIL.BufferSize=10
log4j.appender.MAIL.From=[e-mail]
log4j.appender.MAIL.SMTPHost=www.wusetu.com
log4j.appender.MAIL.Subject=Log4J Message
log4j.appender.MAIL.To=[e-mail]
log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout
log4j.appender.MAIL.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

 

官方例子（可以运行）：

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package examples;

import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.NDC;

/**
   View the <a href="doc-files/Trivial.java">source code</a> of this a
   trivial usage example. Running <code>java examples.Trivial</code>
   should output something similar to:

   <pre>
      0    INFO  [main] examples.Trivial (Client #45890) - Awake awake. Put on thy strength.
      15   DEBUG [main] examples.Trivial (Client #45890 DB) - Now king David was old.
      278  INFO  [main] examples.Trivial$InnerTrivial (Client #45890) - Entered foo.
      293  INFO  [main] examples.Trivial (Client #45890) - Exiting Trivial.  
   </pre>
  
   <p> The increasing numbers at the beginning of each line are the
   times elapsed since the start of the program. The string between
   the parentheses is the nested diagnostic context.

   <p>See {@link Sort} and {@link SortAlgo} for sligtly more elaborate
   examples.

   <p>Note thent class files for the example code is not included in
   any of the distributed log4j jar files. You will have to add the
   directory <code>/dir-where-you-unpacked-log4j/classes</code> to
   your classpath before trying out the examples.

 */
public class Trivial {

  static Logger logger = Logger.getLogger(Trivial.class);

  public static void main(String[] args) {
    BasicConfigurator.configure();
    NDC.push("Client #45890");

    logger.info("Awake awake. Put on thy strength.");
    Trivial.foo();
    InnerTrivial.foo();
    logger.info("Exiting Trivial.");   
  }

  static
  void foo() {
    NDC.push("DB");
    logger.error("Now king David was old.");   
    NDC.pop();
  }

  static class InnerTrivial {
    static  Logger logger = Logger.getLogger(InnerTrivial.class);

    static   
    void foo() {
     NDC.push("foo");
      logger.info("Entered foo.");
    }
  }
}