how to extract the number of the image which looks like a number

[Crest.Boy]

Now,I can generate a image which contains a random number on web page with Servlet, but I CAN NOT extract the number of the image with one common Java Application which I want to write.

Any one can help me?

My Code to generate image on web page (looks disorder, please format in your own IDE)
//--------------------------------------------------
package com.hib.img;

import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Date;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ValidateCodeImage extends HttpServlet {

private static final long serialVersionUID = 1L;

private static String name;

private int width;

private int height;

private int length;

private int interlinenum;

private int maxfontsize;

private int minfontsize;

private String randomCode;


public void init(ServletConfig config) throws ServletException {
super.init(config);
name = config.getInitParameter("name");
width = Integer.parseInt(config.getInitParameter("width")) ;
height = Integer.parseInt(config.getInitParameter("height") );
length = Integer.parseInt(config.getInitParameter("length") );
maxfontsize = Integer.parseInt(config.getInitParameter("maxfonts ize"));
minfontsize = Integer.parseInt(config.getInitParameter("minfonts ize"));
interlinenum = Integer.parseInt(config.getInitParameter("interlin enum"));
}


public void doGet(HttpServletRequest req, HttpServletResponse res) {
//set necessary response infomation
res.setContentType("image/jpeg");
res.setHeader("Pragma", "No-cache");
res.setHeader("Cache-Control", "No-cache");
res.setDateHeader("Expires", 0L);

BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics graph = image.getGraphics();
//set background color and fill the rectangle in specified color
graph.setColor(ImageUtil.getRandomColor(200,55));
graph.fillRect(0, 0, width, height);
//set interrupt line's color and draw random line in specifed color
graph.setColor(ImageUtil.getRandomColor(100,27));
for (int i = 0; i < interlinenum; i++) {
ImageUtil.drawRandomLine(graph, width, height);
}
//set the random code color and draw random code
graph.setColor(ImageUtil.getRandomColor(60,3));
drawRandomCode(graph,width,height,length);
//set session value
HttpSession session = req.getSession();
session.setAttribute(name, this.randomCode);
//release the resource of the image
graph.dispose();
//output the image to the page
try {
ImageIO.write(image, "JPEG", res.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}

public void doPost(HttpServletRequest req, HttpServletResponse res){
doGet(req,res);
}

/**
*
* @param graph graphics context
* @param width width of the range of the graphics context
* @param height height of the range of the graphics context
* @param length length of the random code
*/
private void drawRandomCode(Graphics graph,int width,int height,int length){
StringBuffer sb = new StringBuffer();
String eachCode = null;
int fontsize = minfontsize;
int y = 0;
Random r = new Random(new Date().getTime());
for(int index=0;index<length;index++){
//random code
eachCode = String.valueOf(r.nextInt(10));
//constrct complete random code
sb.append(eachCode);
//random fontsize
fontsize = minfontsize + r.nextInt(maxfontsize-minfontsize);
//random y axes
y = height/2 + r.nextInt(height/2);
//set font and draw random code
graph.setFont(new Font("Times New Roman", Font.BOLD, fontsize));
graph.drawString(eachCode, (int)(index*((double)width/(double)length)), y);
}
this.randomCode = sb.toString();
}

/**
* @return the name
*/
public static String getName() {
return name;
}
}
package com.hib.img;

import java.awt.Color;
import java.awt.Graphics;
import java.util.Date;
import java.util.Random;

public class ImageUtil {
public static final int MAX_COLOR_VALUE = 255;
private static Random r = new Random(new Date().getTime());

public static Color getRandomColor(int base,int range) {
if(range > MAX_COLOR_VALUE){
range = MAX_COLOR_VALUE;
}
int red = base + r.nextInt(range);
int green = base + r.nextInt(range);
int blue = base + r.nextInt(range);
return new Color(red, green, blue);
}

/**
*
* @param graph graphics context
* @param width width of the range of the graphics context
* @param height height of the range of the graphics context
*/
public static void drawRandomLine(Graphics graph, int width, int height) {
int sx = r.nextInt(width);
int ex = r.nextInt(width);
int sy = r.nextInt(height);
int ey = r.nextInt(height);
graph.drawLine(sx, sy, ex, ey);
}
}

[Norm]

please format in your own ID

This forum has tags to do that. Look at the icons above the input box.

CAN NOT extract the number of the image

What is "the number of the image"?
Are you talking about the RGB values used for each pixel in an image?