从Jakarta Commons CookBook中整理出来的非常有用的类和方法，以方便的方法解决了诸如数组操作、日期操作、字符串操作、数字操作、文件操作等常见的问题。这是在java web应用中常见的commons-*.jar包中的内容-The very useful class and method finishing out from Jakarta Commons CookBook, to facilitate the solution of such　operations of array, operations of　date, operations of string, operations of number, operations of　file etc. This is the contents of commons-*. jars commonly in java web application