Log4j原理java控制台个性化输出加超链接标记

package com.herman.util; import java.io.*; /** * @see 自定义日志工具类 * @author Herman.Xiong * @date 2014年4月22日 14:20:15 * @version V1.0 * @since jdk 1.6 */ public class LogUtil implements Serializable{ private static final long serialVersionUID = -3042686055658047285L; private transient Object backtrace; private String detailMessage; private LogUtil cause = this; private StackTraceElement[] stackTrace; public LogUtil() { fillInStackTrace(); } public LogUtil(String message) { fillInStackTrace(); detailMessage = message; } public LogUtil(String message, LogUtil cause) { fillInStackTrace(); detailMessage = message; this.cause = cause; } public LogUtil(LogUtil cause) { fillInStackTrace(); detailMessage = (cause==null ? null : cause.toString()); this.cause = cause; } public String getMessage() { return detailMessage; } public String getLocalizedMessage() { return getMessage(); } public LogUtil getCause() { return (cause==this ? null : cause); } public synchronized LogUtil initCause(LogUtil cause) { if (this.cause != this) throw new IllegalStateException("Can't overwrite cause"); if (cause == this) throw new IllegalArgumentException("Self-causation not permitted"); this.cause = cause; return this; } public String toString() { String s = getClass().getName(); String message = getLocalizedMessage(); return (message != null) ? (s + ": " + message) : s; } public void printStackTrace() { printStackTrace(System.err); } public void printStackTrace(PrintStream s) { s.println(this); StackTraceElement[] trace = getOurStackTrace(); for (int i=0; i < trace.length; i++){ s.println("\tat " + trace[i]); } LogUtil ourCause = getCause(); if (ourCause != null) ourCause.printStackTraceAsCause(s, trace); } private void printStackTraceAsCause(PrintStream s, StackTraceElement[] causedTrace) { StackTraceElement[] trace = getOurStackTrace(); int m = trace.length-1, n = causedTrace.length-1; while (m >= 0 && n >=0 && trace[m].equals(causedTrace[n])) { m--; n--; } int framesInCommon = trace.length - 1 - m; s.println("Caused by: " + this); for (int i=0; i <= m; i++) s.println("\tat " + trace[i]); if (framesInCommon != 0) s.println("\t... " + framesInCommon + " more"); LogUtil ourCause = getCause(); if (ourCause != null) ourCause.printStackTraceAsCause(s, trace); } public void printStackTrace(PrintWriter s) { synchronized (s) { s.println(this); StackTraceElement[] trace = getOurStackTrace(); for (int i=0; i < trace.length; i++) s.println("\tat " + trace[i]); LogUtil ourCause = getCause(); if (ourCause != null) ourCause.printStackTraceAsCause(s, trace); } } private void printStackTraceAsCause(PrintWriter s, StackTraceElement[] causedTrace) { StackTraceElement[] trace = getOurStackTrace(); int m = trace.length-1, n = causedTrace.length-1; while (m >= 0 && n >=0 && trace[m].equals(causedTrace[n])) { m--; n--; } int framesInCommon = trace.length - 1 - m; s.println("Caused by: " + this); for (int i=0; i <= m; i++) s.println("\tat " + trace[i]); if (framesInCommon != 0) s.println("\t... " + framesInCommon + " more"); LogUtil ourCause = getCause(); if (ourCause != null) ourCause.printStackTraceAsCause(s, trace); } public synchronized native Throwable fillInStackTrace(); public StackTraceElement[] getStackTrace() { return (StackTraceElement[]) getOurStackTrace().clone(); } private synchronized StackTraceElement[] getOurStackTrace() { if (stackTrace == null) { int depth = getStackTraceDepth(); stackTrace = new StackTraceElement[depth]; for (int i=0; i < depth; i++) stackTrace[i] = getStackTraceElement(i); } return stackTrace; } public void setStackTrace(StackTraceElement[] stackTrace) { StackTraceElement[] defensiveCopy = (StackTraceElement[]) stackTrace.clone(); for (int i = 0; i < defensiveCopy.length; i++) if (defensiveCopy[i] == null) throw new NullPointerException("stackTrace[" + i + "]"); this.stackTrace = defensiveCopy; } private native int getStackTraceDepth(); private native StackTraceElement getStackTraceElement(int index); private synchronized void writeObject(java.io.ObjectOutputStream s) throws IOException { getOurStackTrace(); s.defaultWriteObject(); } }