基于JMX动态配置Log4J日志级别

package com.minxinloan.common.log;
 
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jmx.export.annotation.ManagedAttribute;
import org.springframework.jmx.export.annotation.ManagedOperation;
import org.springframework.jmx.export.annotation.ManagedOperationParameter;
import org.springframework.jmx.export.annotation.ManagedOperationParameters;
import org.springframework.jmx.export.annotation.ManagedResource;
 
/**
 * 基于JMX动态配置Log4J日志级别，并控制Trace开关的MBean.
 * 
 * @author z
 * @version 2013-12-10
 */
@ManagedResource(objectName = Log4jManager.MBEAN_NAME, description = "Log4j Management Bean")
public class Log4jManager {
 
	/**
	 * Log4jManager的Mbean的注册名称.
	 */
	public static final String MBEAN_NAME = "log4j:name=Log4j";
 
	private static org.slf4j.Logger managerLogger = LoggerFactory.getLogger(Log4jManager.class);
 
	private String projectLoggerName;
 
	@ManagedAttribute(description = "Level of the root logger")
	public String getRootLoggerLevel() {
		Logger logger = Logger.getRootLogger();
//		MBeanServer server = MBeanServerFactory.createMBeanServer();
		return logger.getEffectiveLevel().toString();
	}
 
	@ManagedAttribute
	public void setRootLoggerLevel(String newLevel) {
		Logger logger = Logger.getRootLogger();
		Level level = Level.toLevel(newLevel);
		logger.setLevel(level);
		managerLogger.info("设置Root Logger 级别为{}", newLevel);
	}
 
	/**
	 * 获得项目默认logger的级别.
	 * 项目默认logger名称通过#setProjectLoggerName(String)配置.
	 */
	@ManagedAttribute(description = "Level of the project default package logger")
	public String getProjectLoggerLevel() {
		if (projectLoggerName != null) {
			return getLoggerLevel(projectLoggerName);
		}
 
		return null;
	}
 
	/**
	 * 设置项目默认logger的级别.
	 * 项目默认logger名称通过#setProjectLoggerName(String)配置.
	 */
	@ManagedAttribute
	public void setProjectLoggerLevel(String newLevel) {
		if (projectLoggerName != null) {
			setLoggerLevel(projectLoggerName, newLevel);
		}
	}
 
	/**
	 * 获取Logger的日志级别.
	 */
	@ManagedOperation(description = "Get logging level of the logger")
	@ManagedOperationParameters({ @ManagedOperationParameter(name = "loggerName", description = "Logger name") })
	public String getLoggerLevel(String loggerName) {
		Logger logger = Logger.getLogger(loggerName);
		return logger.getEffectiveLevel().toString();
	}
 
	/**
	 * 设置Logger的日志级别.
	 * 如果日志级别名称错误, 设为DEBUG.
	 */
	@ManagedOperation(description = "Set new logging level to the logger")
	@ManagedOperationParameters({ @ManagedOperationParameter(name = "loggerName", description = "Logger name"),
			@ManagedOperationParameter(name = "newlevel", description = "New level") })
	public void setLoggerLevel(String loggerName, String newLevel) {
		Logger logger = Logger.getLogger(loggerName);
		Level level = Level.toLevel(newLevel);
		logger.setLevel(level);
		managerLogger.info("设置{}级别为{}", loggerName, newLevel);
	}
 
	/**
	 * 根据log4j.properties中的定义, 设置项目默认的logger名称
	 */
	public void setProjectLoggerName(String projectLoggerName) {
		this.projectLoggerName = projectLoggerName;
	}
 
}

import static org.junit.Assert.assertEquals;
 
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.junit.Test;
 
import com.minxinloan.common.log.Log4jManager;
 
 
public class Log4jManagerTest {
	
	@Test
	public void testLoggerLevel() {
		String loggerName = "org.springside.modules";
		Log4jManager mbean = new Log4jManager();
		String orgLevel = mbean.getLoggerLevel(loggerName);
 
		Logger.getLogger(loggerName).setLevel(Level.FATAL);
		assertEquals("FATAL", mbean.getLoggerLevel(loggerName));
 
		mbean.setLoggerLevel(loggerName, "TRACE");
		assertEquals("TRACE", mbean.getLoggerLevel(loggerName));
 
		mbean.setLoggerLevel(loggerName, "WRONG_LEVEL_NAME");
		assertEquals("DEBUG", mbean.getLoggerLevel(loggerName));
 
		mbean.setLoggerLevel(loggerName, orgLevel);
	}
}