Question

Is there an example of a very barebones Netty handler which simply gets whatever data is sent on the wire and writes it to a file?

I was thinking of something along the lines of this:

public class SimpleHandler extends SimpleChannelUpstreamHandler {

public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        HttpRequest request = (HttpRequest) e.getMessage();
        // get data from request and write to a file
}

Any ideas? Thanks for any thoughts

Answer 1

You could also just use this method to transfer the content of the ChannelBuffer to an OutputStream:

http://netty.io/docs/stable/api/org/jboss/netty/buffer/ChannelBuffer.html#readBytes(java.io.OutputStream,%20int)

So something like this:

public class FileWriterHandler extends SimpleChannelHandler {
    private final String filename;

    public FileWriterHandler(String filename) {
        this.filename = filename;
    }

    @Override
    public void messageReceived(ChannelHandlerContext context, MessageEvent event) throws Exception{
        ChannelBuffer buffer = (ChannelBuffer)event.getMessage();
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(filename, true)
            buffer.readBytes(out, buffer.readableBytes());
        } finally {
            if (out != null) out.close();
        }
    }
}