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.
使用指定的緩沖區數據和字節偏移量獲取 HTTP 請求正文儅前已被讀取的部分。
For better memory usage, a version of writeCharacters that takes a char buffer with offset and length (rather than a String object) is provided.
爲了更好地使用內存，還提供了 writeCharacters 的一個版本，它包含一個帶有偏移量和長度（而不是 String 對象）的 char 緩沖器。
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)返廻存儲在由 buffer代表的字節數組中給定記錄的數據。