Using Batik Rasterizer in Java

In this example will create a exporting server for Highchart in Java. Since the default example is in PHP, and I'm using Java and tomcat as my web server.

I convert the PHP exporting script example to Java servlet code.

public class ReportExporter extends HttpServlet {

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

        ServletContext application = this.getServletContext();

        String type = request.getParameter("type");
        String svg = request.getParameter("svg");
        String filename = request.getParameter("filename");
       
        System.out.println("type: " + type);
        System.out.println("svg: " + svg);
        System.out.println("filename: " + filename);
        System.out.println("width: " + request.getParameter("width"));

        if (filename == null && filename.equals("")) {
            filename = "chart";
        }

        String typeString = "";
        String ext = "";
        String outFile = "";
        String width = null;
        String tempName = null;

        try {
            tempName = SecurityUtil.md5(String.valueOf(System
                    .currentTimeMillis()));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        if (type.equals("image/png")) {
            typeString = "-m image/png";
            ext = "png";
        } else if (type.equals("image/jpeg")) {
            typeString = "-m image/jpeg";
            ext = "jpg";
        } else if (type.equals("application/pdf")) {
            typeString = "-m application/pdf";
            ext = "pdf";
        } else if (type.equals("image/svg+xml")) {
            ext = "svg";
        }

        outFile = "temp/" + tempName + "." + ext;
        if (!typeString.equals("")) {
            width = request.getParameter("width");
            if (width != null && !width.equals(""))
                width = "-w " + width;
        }

        // Generate temporary file
        File f = new File(application.getRealPath("/temp/" + tempName
                + ".svg"));
        IOUtil.writeToFile(f, svg);
       
        String batikPath = application.getRealPath("/WEB-INF/lib/batik-rasterizer.jar");
        String classPath = "-cp " + application.getRealPath("/WEB-INF/lib");
        String outFileFullPath = application.getRealPath(outFile);
        String tempFileFullPath = application.getRealPath("temp/"+tempName+".svg");
       
        try {
           
            // Convert SVG file into specified type
            SystemUtil.runCommand("java",classPath, "-jar",batikPath, typeString,"-d",outFileFullPath,width,tempFileFullPath);

            // Show the file to user as download
            response.setHeader("Content-disposition", "attachment; filename=" + filename + "." +ext);
            response.setHeader("Content-type", type);
           
            ServletOutputStream out = response.getOutputStream();
           
            IOUtil.fileToStream(new File(outFileFullPath), out);
           
            out.flush();
            out.close();
        } catch (Throwable e) {
            e.printStackTrace();
            response.getOutputStream().print("Error on exporting");
        }
    }
}

You will need these classes
SystemUtil
IOUtil

This example use Batik rasterizer. Please download it here. Then place it your web application folder
WEB-INF/lib/batik-rasterizer.jar
WEB-INF/lib/batik-slideshow.jar
WEB-INF/lib/batik-squiggle.jar
WEB-INF/lib/batik-svgpp.jar
WEB-INF/lib/batik-ttf2svg.jar
WEB-INF/lib/lib -> contains lib for batik (see batik distribution batik-version/lib)