select 인증번호 방식
3724 단어 자바
package com.zyen.servlet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
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;
/**
*
*
* @author zyen
*
*/
public class RandCodeImageServlet extends HttpServlet {
private static final long serialVersionUID = -1257947018545327308L;
private static final String SESSION_KEY_OF_RAND_CODE = "randCode"; // todo
//private static final int count = 200;//
private static final int width = 73;//
private static final int height = 21;//
//private Font mFont = new Font("Arial Black", Font.PLAIN, 15); //
//private static final int lineWidth = 2;// =1.414*lineWidth
// get post
@Override
public void service(final HttpServletRequest request,final HttpServletResponse response)
throws ServletException,IOException {
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
//int width = 60;
//int height = 20;
BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
g.setFont(new Font("Times New Roman", Font.PLAIN, 20));
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
}
String sRand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
//g.drawString(rand, 13 * i + 6, 16);
g.drawString(rand, 15 * i + 8, 16);
}
//session
request.getSession().setAttribute(SESSION_KEY_OF_RAND_CODE,sRand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
}
/**
* :
* @param fc :
* @param bc :
* @return :
*/
private Color getRandColor(int fc, int bc) { //
final Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
final int r = fc + random.nextInt(bc - fc);
final int g = fc + random.nextInt(bc - fc);
final int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
}
RandCodeImage
com.zyen.servlet.RandCodeImageServlet
RandCodeImage
/randCodeImage