一个程序员能否很好的共事,代码习惯绝对是一个很重要的方面。其中一个容易忽略但是很重要的事情就是打log,有时候为了偷懒不断点调试,会打log输出,好的log应当能够很轻松的被理解打印的目的,配套的几个输出点能够轻易的整理出来,每一个输出点的信息要足够,最好优化下排版。。。。。
就个人而言,我还是注重好习惯的养成的。但是,想要指望别人的习惯是不靠谱的。。。所以在程序中添加一个优雅易用的log工具类是很有必要的。(个人认为程序员随性而发的创造力是生产力的敌人,不定好规矩,总是乱糟糟的,乱糟糟的就会陷入随性的空想(这就是™所谓的创造力),在乱想中浪费时间还影响心情)。
一个好的log工具类首要是输出明显,输出规范,其次是使用方便,不要因为写一句log而浪费太多的时间,接着是方便关闭,在发布版中打log是很不好的事情,让一个程序员去把写的log都关掉不如杀了他。最终是考虑发布后的追踪。扯这么多,不如上代码,哈哈哈。
例如这样一个较为基础的版本:支持将类名变为tag,分级打印,输出log的位置
/** * @ClassName: DLog * @Description: debug工具类 * @date 2016年3月24日 上午9:41:23 * * @author leobert.lan * @version 1.0 */ public class DLog { /** * forceDebug:强制打印,设置为true则打包后也打印log */ public static final boolean forceDebug = false; public static void v(Class<?> clazz, String msg) { log(clazz, msg, LogLevel.v); } public static void v(Class<?> clazz, LogLocation locaion, String msg) { log(clazz, msg + locaion.toString(), LogLevel.v); } public static void d(Class<?> clazz, String msg) { log(clazz, msg, LogLevel.d); } public static void d(Class<?> clazz, LogLocation locaion, String msg) { log(clazz, msg + locaion.toString(), LogLevel.d); } public static void i(Class<?> clazz, String msg) { log(clazz, msg, LogLevel.i); } public static void i(Class<?> clazz, LogLocation locaion, String msg) { log(clazz, msg + locaion.toString(), LogLevel.i); } public static void w(Class<?> clazz, String msg) { log(clazz, msg, LogLevel.w); } public static void w(Class<?> clazz, LogLocation locaion, String msg) { log(clazz, msg + locaion.toString(), LogLevel.w); } public static void e(Class<?> clazz, String msg) { log(clazz, msg, LogLevel.e); } public static void e(Class<?> clazz, LogLocation locaion, String msg) { log(clazz, msg + locaion.toString(), LogLevel.e); } public static void wtf(Class<?> clazz, String msg) { log(clazz, msg, LogLevel.wtf); } public static void wtf(Class<?> clazz, LogLocation locaion, String msg) { log(clazz, msg + locaion.toString(), LogLevel.wtf); } private static void log(Class<?> clazz, String msg, LogLevel level) { if (BuildConfig.DEBUG | forceDebug) { switch (level) { case v: Log.v(clazz.getSimpleName(), msg); break; case d: Log.d(clazz.getSimpleName(), msg); break; case i: Log.i(clazz.getSimpleName(), msg); break; case w: Log.w(clazz.getSimpleName(), msg); break; case e: Log.e(clazz.getSimpleName(), msg); break; case wtf: Log.wtf(clazz.getSimpleName(), msg); break; default: break; } } } enum LogLevel { v, d, i, w, e, wtf; } public static class LogLocation extends Exception { /** * serialVersionUID:TODO(用一句话描述这个变量表示什么). */ private static final long serialVersionUID = 1L; public int line() { StackTraceElement[] trace = getStackTrace(); if (trace == null || trace.length == 0) { return -1; } return trace[0].getLineNumber(); } public String fun() { StackTraceElement[] trace = getStackTrace(); if (trace == null || trace.length == 0) { return ""; } return trace[0].getMethodName(); } public LogLocation() { super(); } @Override public String toString() { return "###logged at:" + line() + "###from function:" + fun() + "###"; } } }