log4j具体操作实例

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1:首先在工程中导入log4j-1.3alpha-3和log4j-chainsaw-1.3alpha-3两个包

2：在任何需要使用log4j的地方，类代码中必须描述！
private static Logger log = Logger.getLogger(Tes5t.class);

如：

package com.viita; import org.apache.log4j.*; import org.w3c.dom.Text; public class Logtest { private static Logger log = Logger.getLogger(Tex5t.class); public void dox() { // TODO Auto-generated method stub //BasicConfigurator.configure(); log.debug("这是调试信息"); log.error("这是错误信息"); log.fatal("这是致命错误"); log.info("这是显示信息"); log.warn("这是警告"); } public static void main(String[] args) { Logtest lg = new Logtest(); lg.dox(); } }

3：必须对log4j进行配置，我们采用两种方法进行配置：xml和资源文件！前提是：两者的名字是固定的，log4j.xml和log4j.properties 都要放置在工程的classes根目录下！

先看xml的配置代码（文件保存形式）：

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="FileAppender" class="org.apache.log4j.FileAppender"> <param name="File" value="c:/1.txt"/> <param name="Append" value="true"/> <layout class="org.apache.log4j.TTCCLayout"> <param name="dateFormat" value="yyyy-MM-dd HH:mm:ss"/> </layout> </appender> <root> <priority value ="error" /> <appender-ref ref="FileAppender"/> </root> </log4j:configuration>

再看xml的控制台输出形式：

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="FileAppender" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.TTCCLayout"> <param name="dateFormat" value="yyyy-MM-dd HH:mm:ss"/> </layout> </appender> <root> <priority value ="error" /> <appender-ref ref="FileAppender"/> </root> </log4j:configuration>

其实在现在的项目中，用得最多的是资源文件的配置！

log4j.rootLogger=DEBUG,FILE #这块进行显示优先级别和输出位置的更改 #DEBUG,CONSOLE,FILE,ROLLING_FILE,MAIL,DATABASE log4j.addivity.org.apache=true ################### # Console Appender ################### log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.Threshold=DEBUG log4j.appender.CONSOLE.Target=System.out log4j.appender.CONSOLE.layout=org.apache.log4j.TTCCLayout log4j.appender.CONSOLE.layout.dateFormat=yyyy-MM-dd HH:mm:ss #log4j.appender.CONSOLE.layout.ConversionPattern=[start]%d{DATE}[DATE]%n%p[PRIORITY]%n%x[NDC]%n%t[THREAD] n%c[CATEGORY]%n%m[MESSAGE]%n%n ##################### # File Appender ##################### log4j.appender.FILE=org.apache.log4j.FileAppender log4j.appender.FILE.File=file.log log4j.appender.FILE.Append=false log4j.appender.FILE.layout=org.apache.log4j.TTCCLayout log4j.appender.CONSOLE.layout.dateFormat=yyyy-MM-dd HH:mm:ss #log4j.appender.FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n # Use this layout for LogFactor 5 analysis ######################## # Rolling File ######################## 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.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 #################### # Socket Appender #################### 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 ######################## # SMTP Appender ####################### log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender log4j.appender.MAIL.Threshold=FATAL log4j.appender.MAIL.BufferSize=10 log4j.appender.MAIL.From=chenyl@hollycrm.com log4j.appender.MAIL.SMTPHost=mail.hollycrm.com log4j.appender.MAIL.Subject=Log4J Message log4j.appender.MAIL.To=chenyl@hollycrm.com log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout log4j.appender.MAIL.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n ######################## # JDBC Appender ####################### 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= log4j.appender.DATABASE.sql=INSERT INTO LOG4J (Message) VALUES ('[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n') log4j.appender.DATABASE.layout=org.apache.log4j.PatternLayout log4j.appender.DATABASE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender log4j.appender.A1.File=SampleMessages.log4j log4j.appender.A1.DatePattern=yyyyMMdd-HH'.log4j' log4j.appender.A1.layout=org.apache.log4j.xml.XMLLayout ################### #DIY 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 = corlin@cybercorlin.net log4j.appender.im.layout=org.apache.log4j.PatternLayout log4j.appender.im.layout.ConversionPattern =[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

这样我们就可以通过一个配置文件来灵活地进行配置，而不需要修改应用的代码更加细致地控制日志的生成过程