Java_JDK_日志

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Java_JDK_日志

简述
实现

简述

个人jar封装，自定义日志接口

实现

项目统一调用接口Log

/**
 * The five logging levels used by Log are (in order):
 * 1. DEBUG (the least serious)
 * 2. INFO
 * 3. WARN
 * 4. ERROR
 * 5. FATAL (the most serious)
 */
public abstract class Log {
	
	private static ILogFactory defaultLogFactory = null;
	
	static {
		init();
	}
	 	
	static void init() {
		if (defaultLogFactory == null) {
			try {
			    //初始化优先查询log4j.jar   没有异常使用jdk
				Class.forName("org.apache.log4j.Logger");
				Class<?> log4jLogFactoryClass = Class.forName("com.xxx.log.Log4jLogFactory");
				defaultLogFactory = (ILogFactory)log4jLogFactoryClass.newInstance();	// return new Log4jLogFactory();
			} catch (Exception e) {
				defaultLogFactory = new JdkLogFactory();
			}
		}
	}
	
	static void setDefaultLogFactory(ILogFactory defaultLogFactory) {
		if (defaultLogFactory == null) {
			throw new IllegalArgumentException("defaultLogFactory can not be null.");
		}
		Log.defaultLogFactory = defaultLogFactory;
	}
	
	public static Log getLog(Class<?> clazz) {
		return defaultLogFactory.getLog(clazz);
	}
	
	public static Log getLog(String name) {
		return defaultLogFactory.getLog(name);
	}
	
	public abstract void debug(String message);
	
	public abstract void debug(String message, Throwable t);
	
	public abstract void info(String message);
	
	public abstract void info(String message, Throwable t);
	
	public abstract void warn(String message);
	
	public abstract void warn(String message, Throwable t);
	
	public abstract void error(String message);
	
	public abstract void error(String message, Throwable t);
	
	public abstract void fatal(String message);
	
	public abstract void fatal(String message, Throwable t);
	
	public abstract boolean isDebugEnabled();

	public abstract boolean isInfoEnabled();

	public abstract boolean isWarnEnabled();

	public abstract boolean isErrorEnabled();
	
	public abstract boolean isFatalEnabled();
}

核心实现-Log4j

org.apache.log4j.Logger 需要引入log4j.jar

/**
 * Log4jLogFactory.
 */
public class Log4jLogFactory implements ILogFactory {
	
	public Log getLog(Class<?> clazz) {
		return new Log4jLog(clazz);
	}
	
	public Log getLog(String name) {
		return new Log4jLog(name);
	}
}

/**
 * Log4jLog.
 */
public class Log4jLog extends Log {
	
	private org.apache.log4j.Logger log;
	private static final String callerFQCN = Log4jLog.class.getName();
	
	Log4jLog(Class<?> clazz) {
		log = org.apache.log4j.Logger.getLogger(clazz);
	}
	
	Log4jLog(String name) {
		log = org.apache.log4j.Logger.getLogger(name);
	}
	
	public static Log4jLog getLog(Class<?> clazz) {
		return new Log4jLog(clazz);
	}
	
	public static Log4jLog getLog(String name) {
		return new Log4jLog(name);
	}
	
	public void info(String message) {
		log.log(callerFQCN, Level.INFO, message, null);
	}
	
	public void info(String message, Throwable t) {
		log.log(callerFQCN, Level.INFO, message, t);
	}
	
	public void debug(String message) {
		log.log(callerFQCN, Level.DEBUG, message, null);
	}
	
	public void debug(String message, Throwable t) {
		log.log(callerFQCN, Level.DEBUG, message, t);
	}
	
	public void warn(String message) {
		log.log(callerFQCN, Level.WARN, message, null);
	}
	
	public void warn(String message, Throwable t) {
		log.log(callerFQCN, Level.WARN, message, t);
	}
	
	public void error(String message) {
		log.log(callerFQCN, Level.ERROR, message, null);
	}
	
	public void error(String message, Throwable t) {
		log.log(callerFQCN, Level.ERROR, message, t);
	}
	
	public void fatal(String message) {
		log.log(callerFQCN, Level.FATAL, message, null);
	}
	
	public void fatal(String message, Throwable t) {
		log.log(callerFQCN, Level.FATAL, message, t);
	}
	
	public boolean isDebugEnabled() {
		return log.isDebugEnabled();
	}
	
	public boolean isInfoEnabled() {
		return log.isInfoEnabled();
	}
	
	public boolean isWarnEnabled() {
		return log.isEnabledFor(Level.WARN);
	}
	
	public boolean isErrorEnabled() {
		return log.isEnabledFor(Level.ERROR);
	}
	
	public boolean isFatalEnabled() {
		return log.isEnabledFor(Level.FATAL);
	}
}

核心实现-JDK

java.util.logging.Logger

/**
 * JdkLogFactory.
 */
public class JdkLogFactory implements ILogFactory {
	
	public Log getLog(Class<?> clazz) {
		return new JdkLog(clazz);
	}
	
	public Log getLog(String name) {
		return new JdkLog(name);
	}
}


/**
 * JdkLog.
 */
public class JdkLog extends Log {

	private java.util.logging.Logger log;
	private String clazzName;
	
	JdkLog(Class<?> clazz) {
		log = java.util.logging.Logger.getLogger(clazz.getName());
		clazzName = clazz.getName();
	}
	
	JdkLog(String name) {
		log = java.util.logging.Logger.getLogger(name);
		clazzName = name;
	}
	
	public static JdkLog getLog(Class<?> clazz) {
		return new JdkLog(clazz);
	}
	
	public static JdkLog getLog(String name) {
		return new JdkLog(name);
	}
	
	public void debug(String message) {
		log.logp(Level.FINE, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message);
	}
	
	public void debug(String message,  Throwable t) {
		log.logp(Level.FINE, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message, t);
	}
	
	public void info(String message) {
		log.logp(Level.INFO, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message);
	}
	
	public void info(String message, Throwable t) {
		log.logp(Level.INFO, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message, t);
	}
	
	public void warn(String message) {
		log.logp(Level.WARNING, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message);
	}
	
	public void warn(String message, Throwable t) {
		log.logp(Level.WARNING, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message, t);
	}
	
	public void error(String message) {
		log.logp(Level.SEVERE, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message);
	}
	
	public void error(String message, Throwable t) {
		log.logp(Level.SEVERE, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message, t);
	}
	
	/**
	 * JdkLog fatal is the same as the error.
	 */
	public void fatal(String message) {
		log.logp(Level.SEVERE, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message);
	}
	
	/**
	 * JdkLog fatal is the same as the error.
	 */
	public void fatal(String message, Throwable t) {
		log.logp(Level.SEVERE, clazzName, Thread.currentThread().getStackTrace()[1].getMethodName(), message, t);
	}
	
	public boolean isDebugEnabled() {
		return log.isLoggable(Level.FINE);
	}
	
	public boolean isInfoEnabled() {
		return log.isLoggable(Level.INFO);
	}
	
	public boolean isWarnEnabled() {
		return log.isLoggable(Level.WARNING);
	}
	
	public boolean isErrorEnabled() {
		return log.isLoggable(Level.SEVERE);
	}
	
	public boolean isFatalEnabled() {
		return log.isLoggable(Level.SEVERE);
	}
}

日志工具类

/**
 * LogKit.
 */
public class LogKit {
	
	private static class Holder {
		private static Log log = Log.getLog(LogKit.class);
	}
	
	/**
	 * 当通过 Constants.setLogFactory(...) 或者 
	 * LogManager.me().setDefaultLogFacotyr(...)
	 * 指定默认日志工厂以后，重置一下内部 Log 对象，以便使内部日志实现与系统保持一致
	 */
	public static void synchronizeLog() {
		Holder.log = Log.getLog(LogKit.class);
	}
	
	/**
	 * Do nothing.
	 */
	public static void logNothing(Throwable t) {
		
	}
	
	public static void debug(String message) {
		Holder.log.debug(message);
	}
	
	public static void debug(String message, Throwable t) {
		Holder.log.debug(message, t);
	}
	
	public static void info(String message) {
		Holder.log.info(message);
	}
	
	public static void info(String message, Throwable t) {
		Holder.log.info(message, t);
	}
	
	public static void warn(String message) {
		Holder.log.warn(message);
	}
	
	public static void warn(String message, Throwable t) {
		Holder.log.warn(message, t);
	}
	
	public static void error(String message) {
		Holder.log.error(message);
	}
	
	public static void error(String message, Throwable t) {
		Holder.log.error(message, t);
	}
	
	public static void fatal(String message) {
		Holder.log.fatal(message);
	}
	
	public static void fatal(String message, Throwable t) {
		Holder.log.fatal(message, t);
	}
	
	public static boolean isDebugEnabled() {
		return Holder.log.isDebugEnabled();
	}
	
	public static boolean isInfoEnabled() {
		return Holder.log.isInfoEnabled();
	}
	
	public static boolean isWarnEnabled() {
		return Holder.log.isWarnEnabled();
	}
	
	public static boolean isErrorEnabled() {
		return Holder.log.isErrorEnabled();
	}
	
	public static boolean isFatalEnabled() {
		return Holder.log.isFatalEnabled();
	}
}