用于加载配置文件的properties类，与java默认的不同，在调用get方法返回value时，会对value 会检查是否存在变量(如：${user.home})，如果存在，会将变量替换成具体的值。
该类使用dectorator设计模式
示例文件内容(profile.properties)：
logFileName = tprofiler.log methodFileName = tmethod.log samplerFileName = tsampler.log startProfTime = 9:00:00 endProfTime = 11:00:00 eachProfUseTime = 5 eachProfIntervalTime = 50 samplerIntervalTime = 20 port = 50000 debugMode = false needNanoTime = false ignoreGetSetMethod = true logFilePath = ${user.home}/logs/${logFileName} methodFilePath = ${user.home}/logs/${methodFileName} samplerFilePath = ${user.home}/logs/${samplerFileName} excludeClassLoader = org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader includePackageStartsWith = com.taobao;com.taobao.common excludePackageStartsWith = com.taobao.sketch;org.apache.velocity;com.alibaba;com.taobao.forest.domain.dataobject 未例代码：
Properties properties = new Properties(); InputStream in = getClass().getClassLoader().getResourceAsStream("profile.properties"); properties.load(in); Properties context = new Properties(System.getProperties()); context.putAll(System.getProperties()); context.putAll(properties); try{ ConfigureProperties configureProperties = new ConfigureProperties(properties, context); String logFilePath = configureProperties.getProperty("logFilePath"); Assert.assertEquals(logFilePath, System.getProperty("user.home") + "/logs/tprofiler.log"); }finally{ in.close(); }
@author manlge
@since 2013-08-18
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