The index of the next character to read from the input stream buffer.
要从输入流缓冲读取的下一个字符的下标。
From that point everything is similar except you will need to flush the output stream or it is possible that the last bit of the stream buffer will not be sent.
从这一点来说，除了您将需要清空输出流(否则流缓冲区的最后一位可能会未被发送)之外，一切都很相似。
Users can stream the output data into a string, an internal buffer, the standard output, or a file.
用户可以使这些输出数据流入字符串、内部缓冲区、标准输出或文件。
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