基于某一文件创建一个输入流，然后基于某一文件创建一个输出流，定义一个int类型的变量，用来记录读出的字节个数，将输入流中的信息写入字节数组中，使用输出流的方法，将数组中的信息写入文件中-Create a file based on an input stream, and then create a file based on an output stream, the definition of an int type of variable, used to record the number of bytes read the input stream of information written into the byte array, the the use of the output flow method to write an array of information documents