How to convert an InputStream to a DataHandler?

Question

I\'m working on a java web application in which files will be stored in a database. Originally we retrieved files already in the DB by simply calling getBytes o

Answer 1

I've meet situation, when InputStream requested from DataSource twice: using Logging Handler together with MTOM feature. With this proxy stream solution my implementation works fine:

import org.apache.commons.io.input.CloseShieldInputStream;
import javax.activation.DataHandler;
import javax.activation.DataSource;
...

private static class InputStreamDataSource implements DataSource {
    private InputStream inputStream;

    @Override
    public InputStream getInputStream() throws IOException {
        return new CloseShieldInputStream(inputStream);
    }

    @Override
    public OutputStream getOutputStream() throws IOException {
        throw new UnsupportedOperationException("Not implemented");
    }

    @Override
    public String getContentType() {
        return "application/octet-stream";
    }

    @Override
    public String getName() {
        return "";
    }
}