经验之谈二日志输出 - 黑马程序员技术交流社区

public class Logger {
public Logger() { }
public void v(String format, Object... args) { }
public void d(String format, Object... args) { }
public void i(String format, Object... args) { }
public void w(String format, Object... args) { }
public void w(Throwable tr, String format, Object... args) { }
public void e(String format, Object... args) { }
public void e(Throwable tr, String format, Object... args) { }
public void wtf(String format, Object... args) { }
public void wtf(Throwable tr, String format, Object... args) { }
｝
public class LogManager {
public static final String Default_Tag = "LOGTEST";
private static Logger Logger;
private static HashMap<String,Logger> LoggerMap = null;
public static Logger getLogger() {
return getLogger(null);
}
public static Logger getLogger(String tag) {
if(BuildConfig.DEBUG) {
return getDebugLogger(tag);
} else {
if (Logger == null) {
Logger = new Logger();
}
return Logger;
}
}
private static Logger getDebugLogger(String tag) {
if(null == tag) tag = Default_Tag;
Logger logger;
if(null == LoggerMap) {
synchronized (LogManager.class) {
if(null == LoggerMap) LoggerMap = new HashMap<String,Logger>();
}
}
if (LoggerMap.containsKey(tag))
logger = LoggerMap.get(tag);
else {
logger = new DebugLogger(tag);
LoggerMap.put(tag, logger);
}
return logger;
}
private static class DebugLogger extends Logger {
private String tag;
private DebugLogger(String tag) {
if(null != this.tag && tag == this.tag) return;
this.tag = null == tag? LogManager.Default_Tag:tag;
}
@Override
public void v(String format, Object... args) {
Log.v(tag, buildSimpleMessage(format, args));
}
@Override
public void d(String format, Object... args) {
Log.d(tag, buildSimpleMessage(format, args));
}
@Override
public void i(String format, Object... args) {
Log.i(tag, buildSimpleMessage(format, args));
}
@Override
public void w(String format, Object... args) {
Log.w(tag, buildMessage(format, args));
}
@Override
public void w(Throwable tr, String format, Object... args) {
Log.w(tag, buildMessage(format, args), tr);
}
@Override
public void e(String format, Object... args) {
Log.e(tag, buildMessage(format, args));
}
@Override
public void e(Throwable tr, String format, Object... args) {
Log.e(tag, buildMessage(format, args), tr);
}
@Override
public void wtf(String format, Object... args) {
Log.wtf(tag, buildMessage(format, args));
}
@Override
public void wtf(Throwable tr, String format, Object... args) {
Log.wtf(tag, buildMessage(format, args), tr);
}
private String buildSimpleMessage(String format, Object... args) {
return (args == null) ? format : String.format(Locale.US, format, args);
}
private String buildMessage(String format, Object... args) {
String msg = buildSimpleMessage(format, args);
StackTraceElement[] trace = new Throwable().fillInStackTrace().getStackTrace();
String caller = "<unknown>";
for (int i = 2; i < trace.length; i++) {
Class<?> clazz = trace[i].getClass();
if (!clazz.equals(DebugLogger.class)) {
String callingClass = trace[i].getClassName();
callingClass = callingClass.substring(callingClass.lastIndexOf('.') + 1);
callingClass = callingClass.substring(callingClass.lastIndexOf('.') + 1);
caller = callingClass + "." + trace[i].getMethodName();
break;
}
}
return String.format(Locale.US, "[%d] %s: %s",
Thread.currentThread().getId(), caller, msg);
}
}
}

复制代码