se.vgregion.mobile.qr.QrController.java Source code

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Here is the source code for se.vgregion.mobile.qr.QrController.java

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/**
 * Copyright 2010 Vstra Gtalandsregionen
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of version 2.1 of the GNU Lesser General Public
 *   License as published by the Free Software Foundation.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the
 *   Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *   Boston, MA 02111-1307  USA
 *
 */

package se.vgregion.mobile.qr;

import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Writer;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

/**
 *
 */
@Controller
public class QrController {

    private final Logger log = LoggerFactory.getLogger(QrController.class);

    @RequestMapping("/qr")
    public void image(@RequestParam("url") String url,
            @RequestParam(value = "width", defaultValue = "300") int width,
            @RequestParam(value = "height", defaultValue = "300") int height, HttpServletResponse response)
            throws ServletException {

        OutputStream out = null;
        try {
            response.setContentType("image/png");
            out = response.getOutputStream();
            Writer writer = new QRCodeWriter();
            BitMatrix matrix = writer.encode(url, BarcodeFormat.QR_CODE, width, height);
            MatrixToImageWriter.writeToStream(matrix, "png", out);
            out.flush();
        } catch (WriterException e) {
            throw new ServletException("Failed writing QR", e);
        } catch (IOException e) {
            throw new ServletException("Failed writing QR", e);
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    // ignore
                }
            }
        }

    }

}