java应用（非web应用）中log4j.properties动态修改配置文件，无

java应用（非web应用）中log4j.properties动态修改配置文件，无需重启，就能立即生效，如何实现？

主要使用：PropertyConfigurator.configureAndWatch(path,1000);// 间隔特定时间，检测文件是否修改，自动重新读取配置

来实现log4j配置文件修改后自动重载。

Log4jConfig.java

package log4jautoload;import org.apache.log4j.PropertyConfigurator;public class Log4jConfig {private static boolean isReload = true;/** * 装载log4j配置文件 * @author zhaigx * @DATE 2011-5-28 */public static void load() {String path = Log4jConfig.class.getClass().getResource("/").getPath()+ "log4j.properties";//String path="config/log4j.properties";System.out.println("log4j configfile path=" + path);PropertyConfigurator.configureAndWatch(path,1000);// 间隔特定时间，检测文件是否修改，自动重新读取配置}private static void reload() {if (isReload) {load();}isReload = false;}public void setReload(boolean flag) {isReload = flag;}}

Logger.java

/* * Created on 2005-6-22 * * TODO To change the template for this generated file go to * Window – Preferences – Java – Code Style – Code Templates */package log4jautoload;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;/** * @author Administrator * * TODO To change the template for this generated type comment go to * Window – Preferences – Java – Code Style – Code Templates */public class Logger {private Log log = null;static{Log4jConfig.load();//装载log4j配置文件}private Logger() {log = LogFactory.getLog(this.getClass());}private Logger(Class c) {log = LogFactory.getLog(c);}private Logger(String className) {log = LogFactory.getLog(className);}public static Logger getLogger() {return new Logger();}public static Logger getLogger(Class c) {return new Logger(c);}public static Logger getLogger(String className) {return new Logger(className);}public void trace(String info) {if (log.isTraceEnabled())log.trace(info);}public void debug(String info) {if (log.isDebugEnabled())log.debug(info);}public void info(String info) {if (log.isInfoEnabled())log.info(info);}public void warn(String info) {if (log.isWarnEnabled())log.warn(info);}public void error(String info) {if (log.isErrorEnabled())log.error(info);}public void fatal(String info) {if (log.isFatalEnabled())log.fatal(info);}public boolean isTraceEnabled() {return log.isTraceEnabled();}public boolean isDebugEnabled() {return log.isDebugEnabled();}public boolean isInfoEnabled() {return log.isInfoEnabled();}public boolean isWarnEnabled() {return log.isWarnEnabled();}public boolean isErrorEnabled() {return log.isErrorEnabled();}public boolean isFatalEnabled() {return log.isFatalEnabled();}}

测试类：

package log4jautoload;public class BeTestClass {static Logger log=Logger.getLogger(BeTestClass.class);public static void main(String[] args) {for (int i = 0; i < 1000; i++) {log.info("———-info");log.debug("———-debug");log.error("———-error");System.out.println("***********************");try {Thread.sleep(2000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

log_home=../loglog4j.rootLogger=info,Consolelog4j.appender.Console=org.apache.log4j.ConsoleAppenderlog4j.appender.Console.layout=org.apache.log4j.PatternLayoutlog4j.appender.Console.layout.ConversionPattern= [%d{yyyyMMdd-HH:mm:ss}-%p][%F:%L] %m%nlog4j.appender.DailyFile=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.DailyFile.Threshold = infolog4j.appender.DailyFile.File=${log_home}/test.loglog4j.appender.DailyFile.encoding=gbklog4j.appender.DailyFile.Append=truelog4j.appender.DailyFile.layout=org.apache.log4j.PatternLayoutlog4j.appender.DailyFile.layout.ConversionPattern=[%d{yyyyMMdd-HH:mm:ss}-%p][%F:%L] %m%n

测试：

运行测试类，然后修改log4j.properties中log4j.rootLogger=info,Console将info改为error或debug，然后查看输出效果。

学做任何事得按部就班，急不得