buffer offset

基本解释

Gets the portion of the HTTP request body that has currently been read by using the specified buffer data and byte offset.
使用指定的缓冲区数据和字节偏移量获取 HTTP 请求正文当前已被读取的部分。
For better memory usage, a version of writeCharacters that takes a char buffer with offset and length (rather than a String object) is provided.
为了更好地使用内存，还提供了 writeCharacters 的一个版本，它包含一个带有偏移量和长度（而不是 String 对象）的 char 缓冲器。
public int getRecord(int recordId, byte[] buffer, int offset) returns the data stored in the given record in the byte array represented by buffer.
public int getRecord(int recordId, byte[] buffer, int offset)返回存储在由 buffer代表的字节数组中给定记录的数据。