Java Servlet Programing Laungage

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
 xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 <filter>
  <filter-name>ImageConvertFilter</filter-name>
  <filter-class>r4r.Filter.ImageConvertFilter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>ImageConvertFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 <session-config>
  <session-timeout>
     30
  </session-timeout>
 </session-config>
</web-app>

Index.jsp

<%-- 
 Document: index.jsp
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
 <head>
  <meta http-equiv="Content-Type"
       content="text/html; charset=UTF-8">
  <title>r4r.co.in-index</title>
 </head>
 <body>
  <h1>Image Conversion Filter!</h1>
  <form method="POST">
  <img src="java-logo1.gif" width="651" 
         height="400" alt="java-logo1"/><br/>
<select name="colorFilter">
 <option>Colorless</option>
 <option>Black&White</option>
 <option>DifferentColor</option>
</select>
<input type="submit" value="Applying Filter" />
  </form><br/>
  <a href="ImageFilter.jsp">
      ImageFilter.jsp|Test purpose</a>
 </body>
</html>

ImageFilter.jsp page

<%-- 
 Document: ImageFilter.jsp
--%>
<%@page import="Acme.JPM.Encoders.GifEncoder"%>
<%@page import="java.awt.image.FilteredImageSource"%>
<%@page import="java.awt.*"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
 <head>
  <meta http-equiv="Content-Type" 
       content="text/html; charset=UTF-8">
  <title>r4r.co.in-ImageFilter</title>
 </head>
 <body>
  <h1>ImageFilter Test page!</h1>
  <form method="POST">
  <img src="java-logo1.gif" width="651" 
             height="400" alt="Text Image"/><br/>
  <select name="applyingFilter">
 <option>ColorLess</option>
 <option>Black&White</option>
 <option>Red&Yellow</option>
 <option>DifferentColor</option> 
</select>
<input type="submit" value="Applying Filter" /><br/>
<a href="index.jsp">Return to Index.jsp page</a>
  </form>
  <%!  java.awt.Frame frame = new java.awt.Frame();%>
  <%
// get requested image full path
String imageName =
  request.getServletContext().getRealPath("java-logo1.gif");
frame.addNotify();
//create a dynamic image with specified image resource
java.awt.Image image = 
  java.awt.Toolkit.getDefaultToolkit().createImage(imageName);
//Track the media object status 
java.awt.MediaTracker mt = new java.awt.MediaTracker(frame);
mt.addImage(image, 0);
// add image into list which track by MediaTracker
mt.waitForAll(); //wait until all image not load into list
  %>

  <%
// get drop-down field value from ImageFilter.jsp page
String filterType = request.getParameter("applyingFilter");
if (filterType != null) {
 if (filterType.equals("Colorless")) {
  /*create an ImageFilter which modifies 
  the image pixels in according with RGB ColorModel.
  */
  java.awt.image.ImageFilter colorFilter =
	   new java.awt.image.RGBImageFilter() {
/*
 *  More color combination for filter
 * 
 * RGB --> YUV|  YUV --> RGB
 * Y =  0.299*Red+0.587*Green+0.114*Blue | Red= Y+0.000*U+1.140*V
 * U = -0.147*Red-0.289*Green+0.436*Blue | Green = Y-0.396*U-0.581*V
 * V =  0.615*Red-0.515*Green-0.100*Blue | Blue  = Y+2.029*U+0.000*V
 */
@Override
public int filterRGB(int x, int y, int rgb) {
 // Get (Red Green Blue) color intensity value
 int Red = (rgb & 0x00ff0000) >> 16;
 int Green = (rgb & 0x0000ff00) >> 8;
 int Blue = rgb & 0x000000ff;

 int Luma = (int) (0.299 * Red + 0.587 * Green + 0.114 * Blue);
 //Return image pixels value to ImageFilter
 return ((0xff << 24) | (Luma << 16) | (Luma << 8) | Luma);
}
  };
/*Creates an offScreenImage from ImageProducer
and applying ImageFilter on it.*/
  java.awt.Image offScreenImage =
	     frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream sos = response.getOutputStream();
// Encode offScreenImage into GIF format and send to client browser
  Acme.JPM.Encoders.GifEncoder encoder = 
	   new GifEncoder(offScreenImage, sos);
  encoder.encode();
 } else if (filterType.equals("Black&White")) {
  java.awt.image.ImageFilter colorFilter = 
	         new java.awt.image.RGBImageFilter() {

@Override
public int filterRGB(int x, int y, int rgb) {
 int Red = (rgb & 0x00ff0000) >> 16;
 int Green = (rgb & 0x0000ff00) >> 8;
 int Blue = rgb & 0x000000ff;

 int U = (int) (-0.147 * Red - 0.289 * Green + 0.436 * Blue);
 return ((0xff << 24) | (U << 16) | (U << 8) | U);
}
  };
 java.awt.Image offScreenImage = 
	frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream sos = response.getOutputStream();
  Acme.JPM.Encoders.GifEncoder encoder = 
	   new GifEncoder(offScreenImage, sos);
  encoder.encode();
 } else if (filterType.equals("Red&Yellow")) {
  java.awt.image.ImageFilter colorFilter = 
	  new java.awt.image.RGBImageFilter() {

@Override
public int filterRGB(int x, int y, int rgb) {

int Red = (rgb & 0x00ff0000) >> 16;
int Green = (rgb & 0x0000ff00) >> 8;
int Blue = rgb & 0x000000ff;

int Y = (int) (0.299 * Red + 0.587 * Green + 0.114 * Blue);
int U = (int) (-0.147 * Red - 0.289 * Green + 0.436 * Blue);
int V = (int) (0.615 * Red - 0.515 * Green - 0.100 * Blue);
 return ((0xff << 24) | (Y << 16) | (U << 8) | V);

}
  };
  java.awt.Image offScreenImage = 
	frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream sos = response.getOutputStream();
  Acme.JPM.Encoders.GifEncoder encoder = 
	    new GifEncoder(offScreenImage, sos);
  encoder.encode();
 } else if (filterType.equals("DifferentColor")) {
  java.awt.image.ImageFilter colorFilter = 
	     new java.awt.image.RGBImageFilter() {

@Override
public int filterRGB(int x, int y, int rgb) {
 return ((rgb & 0xff00ff00)
	    | ((rgb & 0xff0000) >> 16) | ((rgb & 0xff) << 16));
}
  };
  java.awt.Image offScreenImage =
	   frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream sos = response.getOutputStream();
  Acme.JPM.Encoders.GifEncoder encoder = 
	           new GifEncoder(offScreenImage, sos);
  encoder.encode();
 }
 frame.removeNotify(); // free resource
}
  %>
 </body>
</html>

Filter Program

/*
 * Save as a ImageConvertFilter.java
 */
package r4r.Filter;
import java.awt.image.FilteredImageSource;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 *
 * @author R4R
 */
public class ImageConvertFilter implements Filter {

 private static final boolean debug = false;
 private FilterConfig filterConfig = null;
 private java.awt.Frame frame;

 // default constructor
 public ImageConvertFilter() {
 }

 /**
  * Init method for this filter 
  */
 @Override
 public void init(FilterConfig filterConfig) {
  this.filterConfig = filterConfig;
  frame = new java.awt.Frame();
  if (filterConfig != null) {
if (debug) {
 log("ImageConvertFilter: Initializing filter");
}
  }
 }

 /**
  * doFilter method for this filter 
  */
 @Override
 public void doFilter(ServletRequest request,
	 ServletResponse response, FilterChain chain)
throws IOException, ServletException {
  if (debug) {
log("ImageConvertFilter:doFilter()");
  }
  // get requested image full path
  String imagePath =((HttpServletRequest) request)
	       .getServletContext().getRealPath("java-logo1.gif");
  log("Image_Path: " + imagePath);
  frame.addNotify();
  //create a dynamic image with specified image resource
  java.awt.Image image = 
	  java.awt.Toolkit.getDefaultToolkit().createImage(imagePath);
  //Track the media object status 
  java.awt.MediaTracker mt = new java.awt.MediaTracker(frame);
  // add image into list which track by MediaTracker
  mt.addImage(image, 0);
  try {
mt.waitForAll();  //wait until all image not add into list
  } catch (InterruptedException ex) {
Logger.getLogger(ImageConvertFilter.class.getName()).log(Level.SEVERE,
  "An InterruptedException generate while loading image", ex);
  }

  if (request instanceof HttpServletRequest) {
// get drop-down field value from index.jsp page
String filterType = request.getParameter("colorFilter");
log("Filter_Type" + filterType);
if (filterType != null) {

 if (filterType.equals("Colorless")) {
  /*create an ImageFilter which modifies the image 
  pixels in according with RGB ColorModel.*/
  java.awt.image.ImageFilter colorFilter = 
	        new java.awt.image.RGBImageFilter() {

@Override
public int filterRGB(int x, int y, int rgb) {
 // Get (Red Green Blue) color intensity value
 int Red = (rgb & 0x00ff0000) >> 16;
 int Green = (rgb & 0x0000ff00) >> 8;
 int Blue = rgb & 0x000000ff;

 int Luma = (int) (0.299 * Red + 0.587 * Green + 0.114 * Blue);
 //Return image pixels value to ImageFilter
 return ((0xff << 24) | (Luma << 16) | (Luma << 8) | Luma);
}
  };
//Creates an offScreenImage from ImageProducer and applying ImageFilter on it
  java.awt.Image offScreenImage =
	  frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream out = response.getOutputStream();
  // Encode offScreenImage into GIF format and send to client browser
  response.setContentType("image/gif");
  Acme.JPM.Encoders.GifEncoder encoder = 
	  new Acme.JPM.Encoders.GifEncoder(offScreenImage, out);
  encoder.encode();
 } else if (filterType.equals("Black&White")) {
  java.awt.image.ImageFilter colorFilter =
	     new java.awt.image.RGBImageFilter() {

@Override
public int filterRGB(int x, int y, int rgb) {
 int Red = (rgb & 0x00ff0000) >> 16;
 int Green = (rgb & 0x0000ff00) >> 8;
 int Blue = rgb & 0x000000ff;

 int V = (int) (0.615 * Red - 0.515 * Green - 0.100 * Blue);
 return ((0xff << 24) | (V << 16) | (V << 8) | V);
}
  };
  java.awt.Image offScreenImage = 
	frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream out = response.getOutputStream();
  response.setContentType("image/gif");
  Acme.JPM.Encoders.GifEncoder encoder =
	  new Acme.JPM.Encoders.GifEncoder(offScreenImage, out);
  encoder.encode();
 } else {
  java.awt.image.ImageFilter colorFilter = 
	          new java.awt.image.RGBImageFilter() {

@Override
public int filterRGB(int x, int y, int rgb) {
 return ((rgb & 0xff00ff00) |
	       ((rgb & 0xff0000) >> 16) | ((rgb & 0xff) << 16));
}
  };
  java.awt.Image offScreenImage =
	   frame.createImage(new FilteredImageSource(image.getSource(),
 colorFilter));
  ServletOutputStream out = response.getOutputStream();
  response.setContentType("image/gif");
  Acme.JPM.Encoders.GifEncoder encoder =
	     new Acme.JPM.Encoders.GifEncoder(offScreenImage, out);
  encoder.encode();
 }
} else {
 chain.doFilter(request, response);
}
  }
 }

 /**
  * Return the filter configuration object for this filter.
  */
 public FilterConfig getFilterConfig() {
  return (this.filterConfig);
 }

 /**
  * Set the filter configuration object for this filter.
  */
 public void setFilterConfig(FilterConfig filterConfig) {
  this.filterConfig = filterConfig;
 }

 /**
  * Destroy method for this filter 
  */
 @Override
 public void destroy() {
  filterConfig = null;
  frame.removeNotify();
 }

 /**
  * log method for print msg over server console 
  */
 public void log(String msg) {
  filterConfig.getServletContext().log(msg);
 }
}