首先创建必要的输入流，然后遍历所有记录，把其中的内容存储到一个字节数组。
We begin by creating the necessary input streams, then loop through each record, storing its contents in a byte array.
TCPIPServer Input节点从输入流接收到30个字节的数据。
The TCPIPServer Input node receives 30 bytes of data from the input stream.
如果在读入最大数量的字节前，抵达输入流结尾，方法返回- 1。
This method returns -1 if it reaches the end of the input stream before reading the maximum number of bytes.
如果在读入最大数量的字节前，抵达输入流结尾，方法返回- 1。
This method returns -1 if it reaches the end of the input stream before reading the maximum number of bytes.
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