How to put data from an OutputStream into a ByteBuffer?

Question

In Java I need to put content from an OutputStream (I fill data to that stream myself) into a ByteBuffer. How to do it in a simple way?

Answer 1

Though the above-mention answers solve your problem, none of them are efficient as you expect from NIO. ByteArrayOutputStream or MyByteArrayOutputStream first write the data into a Java heap memory and then copy it to ByteBuffer which greatly affects the performance.

An efficient implementation would be writing ByteBufferOutputStream class yourself. Actually It's quite easy to do. You have to just provide a write() method. See this link for ByteBufferInputStream.