source code

==========renderfilter.java

package filter;

import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.io.StringReader;import java.io.Writer;

import javax.imageio.ImageIO;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;

import org.apache.batik.svggen.SVGGeneratorContext;import org.apache.batik.svggen.SVGGraphics2D;import org.w3c.dom.Document;import org.xhtmlrenderer.pdf.ITextRenderer;import org.xhtmlrenderer.simple.Graphics2DRenderer;import org.xml.sax.InputSource;import org.xml.sax.SAXException;

import com.lowagie.text.DocumentException;

public class RendererFilter implements Filter {

 FilterConfig config; private DocumentBuilder documentBuilder;  public void init(FilterConfig config) throws ServletException {  try {   this.config = config;   DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();   documentBuilder = factory.newDocumentBuilder();  } catch (ParserConfigurationException e) {   throw new ServletException(e);  } }

 public void doFilter(ServletRequest req, ServletResponse resp,        FilterChain filterChain) throws IOException, ServletException {    HttpServletRequest request = (HttpServletRequest)req;  HttpServletResponse response = (HttpServletResponse)resp;    //Check to see if this filter should apply.  String renderType = request.getParameter("RenderOutputType");  if(renderType != null){   //Capture the content for this request   ContentCaptureServletResponse capContent = new ContentCaptureServletResponse(response);   filterChain.doFilter(request,capContent);     try {    //Parse the XHTML content to a document that is readable by the XHTML renderer.    StringReader contentReader = new StringReader(capContent.getContent());    InputSource source = new InputSource(contentReader);    Document xhtmlContent = documentBuilder.parse(source);        if(renderType.equals("pdf")){     ITextRenderer renderer = new ITextRenderer();     renderer.setDocument(xhtmlContent,"");     renderer.layout();          response.setContentType("application/pdf");     OutputStream browserStream = response.getOutputStream();     renderer.createPDF(browserStream);     return;    }        //For the other formats, you might need to specify a width and a height.    int width = 850;    int height = 500;        try{     if(request.getParameter("width") != null) width = Integer.parseInt(request.getParameter("width"));     if(request.getParameter("height") != null) height = Integer.parseInt(request.getParameter("height"));    }catch(NumberFormatException ne){ /*Nothing much to do here*/}        Graphics2DRenderer renderer = new Graphics2DRenderer();    renderer.setDocument(xhtmlContent,"");        if(renderType.equals("image")){          BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);     Graphics2D imageGraphics = (Graphics2D)image.getGraphics();     imageGraphics.setColor(Color.white);     imageGraphics.fillRect(0, 0, width, height);     renderer.layout(imageGraphics,new Dimension(width,height));     renderer.render(imageGraphics);          //Now finally output the image to PNG using the ImageIO libraries.     OutputStream browserStream = response.getOutputStream();     response.setContentType("image/png");     ImageIO.write(image, "png", browserStream);          return;    }        if(renderType.equals("svg")){

     Document svgDocument = documentBuilder.newDocument();     BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);     Graphics2D layoutGraphics = (Graphics2D)image.getGraphics();          // Create an instance of the SVG Generator     SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(svgDocument);     ctx.setEmbeddedFontsOn(true);     ctx.setPrecision(12);     SVGGraphics2D svgGenerator = new SVGGraphics2D(ctx,false); 

     renderer.layout(layoutGraphics,new Dimension(width,height));     renderer.render(svgGenerator);          // Finally, stream out SVG to the browser     response.setContentType("image/svg+xml");     Writer browserOutput = response.getWriter();     svgGenerator.stream(browserOutput, true);          return;    }       } catch (SAXException e) {    throw new ServletException(e);   } catch (DocumentException e) {    throw new ServletException(e);   }        }else{   //Normal processing   filterChain.doFilter(request,response);  } }

  public void destroy() { }}

=============ContentCaptureServletResponse.java

package filter;

import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpServletResponseWrapper;

public class ContentCaptureServletResponse extends HttpServletResponseWrapper {  private ByteArrayOutputStream contentBuffer; private PrintWriter writer;  public ContentCaptureServletResponse(HttpServletResponse originalResponse) {  super(originalResponse);  }

 @Override public PrintWriter getWriter() throws IOException {  if(writer == null){   contentBuffer = new ByteArrayOutputStream();   writer = new PrintWriter(contentBuffer);  }  return writer; }  public String getContent(){  writer.flush();  String xhtmlContent = new String(contentBuffer.toByteArray());  xhtmlContent = xhtmlContent.replaceAll("<thead>|</thead>|"+               "<tbody>|</tbody>","");  return xhtmlContent;  }}