ch.ledcom.demo.redirect.ImageServlet.java Source code

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Here is the source code for ch.ledcom.demo.redirect.ImageServlet.java

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/**
 *     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.
 */
package ch.ledcom.demo.redirect;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.common.io.ByteStreams;
import com.google.common.io.Closer;
import com.google.common.io.Resources;

public class ImageServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private byte[] imageBytes;

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        Closer closer = Closer.create();
        try {
            InputStream imageStream = closer.register(loadImage());
            ByteStreams.copy(imageStream, resp.getOutputStream());
        } catch (Throwable t) {
            throw closer.rethrow(t);
        } finally {
            closer.close();
        }
    }

    private InputStream loadImage() throws IOException {
        if (imageBytes == null) {
            imageBytes = Resources.toByteArray(getClass().getClassLoader().getResource("test.png"));
        }
        return new ByteArrayInputStream(imageBytes);
    }
}