* 简单的读/写文本文件的示例

* 这里包含了三个例子，即

* 1. 将文件读入到内存（这里是StringBuffer）的例子

* 2. 将内容中的文本写到文件

* 3. 将一个文件的内容读出来写入另一个文件中

同时也展示了如果从输入流中读出来内容写入输出流中（仅限文本流）

三个例子可以独立存在，所以根据需要只看其中一个就行了-* A simple read/write a text file that contains the sample* of the three examples here, that is* 1. To file read into memory (in this StringBuffer) examples* 2. Will write the contents of the text file* 3. Will the contents of a document read out to write another paper also demonstrated from the input stream to read out the content written into the output stream (only the text flow) the existence of three examples can be independent, so one need only look at the line a