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Servlet 3 filter for HTTP request and response logging

There is a newer version: 1.5.1

package org.zalando.logbook.servlet;

/*
 * #%L
 * Logbook: Core
 * %%
 * Copyright (C) 2015 - 2016 Zalando SE
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Objects;

final class ByteStreams {

    ByteStreams() {
        // package private so we can trick code coverage
    }

    public static byte[] toByteArray(final InputStream in) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        copy(in, out);
        return out.toByteArray();
    }

    public static void copy(final InputStream from, final OutputStream to) throws IOException {
        Objects.requireNonNull(from);
        Objects.requireNonNull(to);
        final byte[] buf = new byte[4096];
        while (true) {
            final int r = from.read(buf);
            if (r == -1) {
                break;
            }
            to.write(buf, 0, r);
        }
    }
}