final long fileSize = ChannelUtil.size(channel);

            if (fileSize > maxSize) {
                throw new IORuntimeException(new IOException("File too large: " + fileSize + " bytes (max: " + maxSize + " bytes). Use streaming APIs for large files."));
            }

            final ByteBuffer buffer = ByteBuffer.allocate((int) fileSize);
            ChannelUtil.read(channel, buffer);

import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.core.net.URLUtil;
import org.codelibs.core.nio.ChannelUtil;

/**
 * Utility for copying.
 * <p>
 * The combinations of input and output types and the unit of elements copied are as follows:
 * </p>
 * <table border="1">