当写入小于缓冲区大小（例如8 KB）时，bufferedoutputstream会提供帮助。对于较大的写入，它无济于事，也不会使其变得更糟。如果您的所有写操作都大于缓冲区大小，或者每次写操作后始终都使用flush（），则我不会使用缓冲区。但是，如果您的写入中有很大一部分小于缓冲区大小，并且您并非每次都使用flush（），那么值得这样做。
您可能会发现将缓冲区大小增加到32 KB或更大可以对您有所改善，或者使情况变得更糟。青年汽车
您可能会发现bufferedoutputstream.write的代码很有用
/**
* Writes <code>len</code> bytes from the specified byte array
* starting at offset <code>off</code> to this buffered output stream.
*
* <p> Ordinarily this method stores bytes from the given array into this
* stream's buffer, flushing the buffer to the underlying output stream as
* needed. If the requested length is at least as large as this stream's
* buffer, however, then this method will flush the buffer and write the
* bytes directly to the underlying output stream. Thus redundant
* <code>bufferedoutputstream</code>s will not copy data unnecessarily.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
* @exception IOException if an I/O error occurs.
*/
public synchronized void write(byte b[], int off, int len) throws IOException {
if (len >= buf.length) {
/* If the request length exceeds the size of the output buffer,
flush the output buffer and then write the data directly.
In this way buffered streams will cascade harmlessly. */
flushBuffer();
out.write(b, off, len);
return;
}
if (len > buf.length - count) {
flushBuffer();
}
System.arraycopy(b, off, buf, count, len);
count += len;
}
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