java中log4j简单应用

JAVA程序开发，经常用到日志输出，在一个所谓的软件公司里大多会有自己一套配置风格，读取配置文件再对日志属性进行初始化，这样固然好，但有时可能并不需要小题大做，然log4j这个包一定会经常用到，以下就是一个简单应用。前题，下载一个log4j的包，本人用log4j-1.2.9.jar。 新建一个java项目，内容如下，根据实际需要改本地的包名和类名。

 

/**
 * filename   : MiProperty.java
 * Title      : 北京minstar软件工作室
 * Description: 关于log4j包的最简单应用
 * @Copyright  : Copyright (c) 2008，北京minstar软件工作室
 * Company    : 北京minstar软件工作室
 * @author       : Zhao.Jian
 * Date          : 2007-8-16
 * @version 1.0.0.0
 * @Development Environment        :  Eclipse 3.1.0
 */
package app;

import java.io.FileInputStream;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;


public class logjTest {
    public static final Logger logger = Logger.getLogger(logjTest.class);
    public static void main(String args[])throws Exception{
        String configFile = "log4j.properties";
        PropertyConfigurator.configure(configFile);
        logger.info("测试log4j之包的使用!");
        Properties perties = new Properties();
        FileInputStream fis = new FileInputStream(configFile);
        perties.load(fis);
        String str=perties.getProperty("log4j.rootLogger");
        logger.info("测试获取key值,如log4j.rootLogger="+str);
    }
}

/**   
 * filename   : MiProperty.java   
 * Title      : 北京minstar软件工作室   
 * Description: 关于log4j包的最简单应用   
 * @Copyright  : Copyright (c) 2008，北京minstar软件工作室   
 * Company    : 北京minstar软件工作室   
 * @author       : Zhao.Jian   
 * Date          : 2007-8-16   
 * @version 1.0.0.0   
 * @Development Environment        :  Eclipse 3.1.0   
 */   
package app;
 
import java.io.FileInputStream;    
import java.util.Properties;    
import org.apache.log4j.Logger;    
import org.apache.log4j.PropertyConfigurator;    
   
   
public class logjTest {    
    public static final Logger logger = Logger.getLogger(logjTest.class);    
    public static void main(String args[])throws Exception{    
        String configFile = "log4j.properties";     
        PropertyConfigurator.configure(configFile);     
        logger.info("测试log4j之包的使用!");       
        Properties perties = new Properties();    
        FileInputStream fis = new FileInputStream(configFile);    
        perties.load(fis);    
        String str=perties.getProperty("log4j.rootLogger");    
        logger.info("测试获取key值,如log4j.rootLogger="+str);         
    }    
}

 
 

 

属性文件名：log4j.properties，内容：

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
#log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
#log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
#%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n


### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=debug,R,stdout
#####log4j.logger.net.sf.hibernate=info

####????
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=logs/logtest.log
log4j.appender.R.MaxFileSize=1000KB
log4j.appender.R.MaxBackupIndex=5
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%p] %c -%m%n
#log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
log4j.appender.R.layout.ConversionPattern=[%-d{yyyy-MM-dd HH:mm:ss}] %p %t %c - %m%n


### log just the SQL
#log4j.logger.net.sf.hibernate.SQL=debug

### log JDBC bind parameters ###
log4j.logger.net.sf.hibernate.type=info

### log schema export/update ###
log4j.logger.net.sf.hibernate.tool.hbm2ddl=debug

### log cache activity ###
#log4j.logger.net.sf.hibernate.cache=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.net.sf.hibernate.connection.DriverManagerConnectionProvider=trace

#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

### direct log messages to stdout ###    
log4j.appender.stdout=org.apache.log4j.ConsoleAppender    
#log4j.appender.stdout.Target=System.out    
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout    
#log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n    
#%d{ABSOLUTE} %5p %c{1}:%L - %m%n    
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n    
   
   
### direct messages to file hibernate.log ###    
#log4j.appender.file=org.apache.log4j.FileAppender    
#log4j.appender.file.File=hibernate.log    
#log4j.appender.file.layout=org.apache.log4j.PatternLayout    
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n    
   
### set log levels - for more verbose logging change 'info' to 'debug' ###    
   
log4j.rootLogger=debug,R,stdout    
#####log4j.logger.net.sf.hibernate=info    
   
####????    
log4j.appender.R=org.apache.log4j.RollingFileAppender    
log4j.appender.R.File=logs/logtest.log    
log4j.appender.R.MaxFileSize=1000KB    
log4j.appender.R.MaxBackupIndex=5   
log4j.appender.R.layout=org.apache.log4j.PatternLayout    
log4j.appender.stdout.layout.ConversionPattern=%d [%p] %c -%m%n    
#log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n    
log4j.appender.R.layout.ConversionPattern=[%-d{yyyy-MM-dd HH:mm:ss}] %p %t %c - %m%n   
   
   
### log just the SQL    
#log4j.logger.net.sf.hibernate.SQL=debug    
   
### log JDBC bind parameters ###    
log4j.logger.net.sf.hibernate.type=info    
   
### log schema export/update ###    
log4j.logger.net.sf.hibernate.tool.hbm2ddl=debug    
   
### log cache activity ###    
#log4j.logger.net.sf.hibernate.cache=debug    
   
### enable the following line if you want to track down connection ###    
### leakages when using DriverManagerConnectionProvider ###    
#log4j.logger.net.sf.hibernate.connection.DriverManagerConnectionProvider=trace    
   
#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

 

   

  log4j.properties中几处值得关注。
  1:log4j.appender.R.File=logs/logtest.log
  日志输出路径及命名，以下为相对路径法，根据实际情况改之。

  2:log4j.appender.R.MaxFileSize=1000KB
  每个日志文件大小。

  3:log4j.appender.R.MaxBackupIndex=5
  每生成多少个日志滚动，会生成一些logtest.log1, logtest.log2，但不会有logtest.log6,如果配置成10，不会有logtest.log11。

  4:log4j.appender.R.layout.ConversionPattern=[%-d{yyyy-MM-dd HH:mm:ss}] %p %t %c - %m%n
  日志输出时日期的风格之类的，通常我不改，其它还有一些属性设置，网上有很多文章介绍，此处以高效，简洁，共享为宗旨，相信该文值得再次参考。