log4j

好用的log4j，reload 跟SocketAppender

Reload參數定義:

DOMConfigurator.configureAndWatch("log4j.xml", 1000);

PropertyConfigurator.configureAndWatch("log4j.properites", 1000);

每秒鐘RELOAD參數

SocketAppender:

多個JVM或不同的CLIENT想要ACCESS同一份OUTPUT檔案

可先透過log4j起SERVER

java -classpath log4j.jar org.apache.log4j.net.SimpleSocketServer 4445 simplesocketserver.properties(此檔案需要定義)

定義檔案如下:

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log4j.rootLogger=stdout,Roll

log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n log4j.appender.Roll=org.apache.log4j.RollingFileAppender log4j.appender.Roll.File=remote_log.log

log4j.appender.Roll.MaxFileSize=1024KB log4j.appender.Roll.layout=org.apache.log4j.PatternLayout log4j.appender.Roll.layout.ConversionPattern=%p %t %c - %m%n

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CLIENT寫法如下:

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public class testLogSocket {

static Logger logger = Logger.getRootLogger();

public static void main(String argv[]) {

System.out.println("Try sending logs");

PropertyConfigurator.configure("remoteLog4j.properties");

logger.debug("Hello SocketAppender");

}

}

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配合底下log4j定義檔

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log4j.rootCategory=stdout,remote

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

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

log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.remote=org.apache.log4j.net.SocketAppender

log4j.appender.remote.Port=4445 log4j.appender.remote.RemoteHost=127.0.0.1

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