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);
}
}