import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class GraphicValidator
*/
public class GraphicValidator extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public GraphicValidator() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
process(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
process(request, response);
}
private void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("image/jpeg");
response.setCharacterEncoding("UTF-8");
List<String> fonts = new ArrayList<String>();
GraphicsEnvironment.getLocalGraphicsEnvironment().preferLocaleFonts();
String[] names = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames(Locale.CHINA);
for (String s : names) {
char c = s.charAt(0);
if (!(Character.isLowerCase(c) || Character.isUpperCase(c))) {
fonts.add(s);
}
}
BufferedImage image = new BufferedImage(200, 50, BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = image.createGraphics();
char[] numbers = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
char[] use = new char[4];
graphic.setColor(new Color(240, 240, 240));
graphic.fillRect(0, 0, 200, 50);
for (int i = 0; i < 4; i++) {
Point p = new Point(5 + (i * ((int) (Math.random() * 10) + 40)), 40);
int size = 0;
int[] sizes = new int[20];
for (int j = 0; j < 20; j++) {
sizes[j] = 30 + j;
}
size = sizes[(int) (Math.random() * sizes.length)];
int face = 0;
if (Math.random() * 10 > 5) {
face = Font.BOLD;
} else {
face = Font.ITALIC;
}
use[i] = numbers[(int) (Math.random() * numbers.length)];
graphic.setPaint(new GradientPaint(p.x, p.y, new Color((int) (Math.random() * 256), 0, (int) (Math.random() * 256)), p.x, p.y - size, new Color((int) (Math.random() * 256), (int) (Math.random() * 256), (int) (Math.random() * 256))));
graphic.setFont(new Font(fonts.get((int) (Math.random() * fonts.size())), face, size));
graphic.drawString("" + use[i], p.x, p.y);
}
String output = new String(use);
request.getSession().setAttribute("code", output);
graphic.setPaint(null);
for (int i = 0; i < 4; i++) {
graphic.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
graphic.drawLine((int) (Math.random() * 200), (int) (Math.random() * 50), (int) (Math.random() * 200), (int) (Math.random() * 50));
}
Random random = new Random();
for (int i = 0; i < 88; i++) {
int x = random.nextInt(200);
int y = random.nextInt(50);
graphic.setColor(new Color((int) (Math.random() * 0x00FFFFFFF)));
graphic.setStroke(new BasicStroke((float) (Math.random() * 3)));
graphic.drawLine(x, y, x, y);
}
OutputStream ot = response.getOutputStream();
ImageIO.write(image, "JPEG", ot);
graphic.dispose();
ot.close();
}
}
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