Batik Service. Take svg, image_type as input. and convert the svg to image of given type

BatikService.java

package ly.visual;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.transcoder.Transcoder;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.JPEGTranscoder;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.batik.util.XMLResourceDescriptor;
import org.w3c.dom.Document;

@WebServlet("/BatikService")
public class BatikService extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public BatikService() {
        super();
    }

    /*
     * Example svg: 
     * <svg xmlns="http://www.w3.org/2000/svg" version="1.1">
     *      <circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" />
     * </svg> 
     * 
     * encode the svg to url format with http://www.motobit.com/util/url-encoder.asp
     * 
     * http://localhost:8080/BatikService1/BatikService?image_type=png&svg=%3Csvg+xml...
     * where the ellipsis are the escaped svg
     * 
     * Post request has max post size limit set to 2MB (http://tomcat.apache.org/tomcat-5.5-doc/config/http.html)
     * Fix it by changing server.xml to something like below which accepts unlimited size posts(totally dangerous):
     * <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" maxPostSize="0"/>
     */
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        Date d1 = new Date();
        
        String svg = request.getParameter("svg");
        String imageType = request.getParameter("image_type");
        
        InputStream inputStream = new ByteArrayInputStream(svg.getBytes());
        OutputStream outputStream = response.getOutputStream();
        
        Document doc = getDocument(inputStream);

        TranscoderInput input = new TranscoderInput(doc);
        TranscoderOutput output = new TranscoderOutput(outputStream);
        
        try {
            Transcoder transcoder = getTranscoder(imageType, 0.7f);
            transcoder.transcode(input, output);
        } catch (TranscoderException e) {
            e.printStackTrace();
        }
        

        Date d2 = new Date();
        System.out.println(d2.getTime() - d1.getTime());
        response.setContentType("image/" + imageType);
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    private Document getDocument(InputStream inputStream) throws IOException {
        String parser = XMLResourceDescriptor.getXMLParserClassName();
        SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
        Document doc = f.createDocument("http://www.w3.org/2000/svg",
                inputStream);
        return doc;
    }

    private Transcoder getTranscoder(String transcoderType, float keyQuality) {
        Transcoder transcoder = null;
        if (transcoderType.equals("jpeg")) {
            transcoder = getJPEGTranscoder(keyQuality);
        } else if (transcoderType.equals("png")) {
            transcoder = getPNGTranscoder();
        }
        return transcoder;
    }

    private JPEGTranscoder getJPEGTranscoder(float keyQuality) {
        JPEGTranscoder jpeg = new JPEGTranscoder();
        jpeg.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(
                keyQuality));
        return jpeg;
    }

    private PNGTranscoder getPNGTranscoder() {
        return new PNGTranscoder();
    }

}