关于properties文件的读取，应该满足多数情况的需要，但是碰到一个问题，就是原本可以正常读取的文件，打包成.jar就不能正确读取了。

想到“Commons Logging就会使用Log4j和它在上下文类路径中找到的log4j.properties文件。”于是翻看commonsLogging的源码，发现在simpleLog.java的类里有这么读取properties文件的。

 InputStream in = getResourceAsStream("simplelog.properties");

这里他用了自己的getResourceAsStream()方法

    /**
     * Return the thread context class loader if available.
     * Otherwise return null.
     *
     * The thread context class loader is available for JDK 1.2
     * or later, if certain security conditions are met.
     *
     * @exception LogConfigurationException if a suitable class loader
     * cannot be identified.
     */
    private static ClassLoader getContextClassLoader()
    {
        ClassLoader classLoader = null;

        if (classLoader == null) {
            try {
                // Are we running on a JDK 1.2 or later system?
                Method method = Thread.class.getMethod("getContextClassLoader", null);

                // Get the thread context class loader (if there is one)
                try {
                    classLoader = (ClassLoader)method.invoke(Thread.currentThread(), null);
                } catch (IllegalAccessException e) {
                    ;  // ignore
                } catch (InvocationTargetException e) {
                    /**
                     * InvocationTargetException is thrown by 'invoke' when
                     * the method being invoked (getContextClassLoader) throws
                     * an exception.
                     *
                     * getContextClassLoader() throws SecurityException when
                     * the context class loader isn't an ancestor of the
                     * calling class's class loader, or if security
                     * permissions are restricted.
                     *
                     * In the first case (not related), we want to ignore and
                     * keep going.  We cannot help but also ignore the second
                     * with the logic below, but other calls elsewhere (to
                     * obtain a class loader) will trigger this exception where
                     * we can make a distinction.
                     */
                    if (e.getTargetException() instanceof SecurityException) {
                        ;  // ignore
                    } else {
                        // Capture 'e.getTargetException()' exception for details
                        // alternate: log 'e.getTargetException()', and pass back 'e'.
                        throw new LogConfigurationException
                            ("Unexpected InvocationTargetException", e.getTargetException());
                    }
                }
            } catch (NoSuchMethodException e) {
                // Assume we are running on JDK 1.1
                ;  // ignore
            }
        }

        if (classLoader == null) {
            classLoader = SimpleLog.class.getClassLoader();
        }

        // Return the selected class loader
        return classLoader;
    }

    private static InputStream getResourceAsStream(final String name)
    {
        return (InputStream)AccessController.doPrivileged(
            new PrivilegedAction() {
                public Object run() {
                    ClassLoader threadCL = getContextClassLoader();

                    if (threadCL != null) {
                        return threadCL.getResourceAsStream(name);
                    } else {
                        return ClassLoader.getSystemResourceAsStream(name);
                    }
                }
            });
    }

详细的思路空了再慢慢看。这样就可以解决jar包中属性文件的正常读取