Bytebuf有几种不同的操作模式

操作ByteBuf.java

ByteBuf buf = ...// get ByteBuf
int length = buf.readableBytes();//get readable length
if(buf.hasArray()){
    //ByteBuf in heap
    byte[] array = buf.array();
    int offset = buf.arrayOffset()+buf.readerIndex();
    handleArray(array,offset,length);//your method
}else{
    //ByteBuf in direct buffer
    byte[] array=new byte[length];
    buf.getBytes(buf.readerIndex(),array);//copy it to new bytes array
    handleArray(array,0,length);//your method
}