用java写的比较好看的验证码程序

package com.apectra.pub;

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.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Vimage extends HttpServlet {
public void destroy() {
  super.destroy();
}
/*
  * service
  * (non-Javadoc)
  * @see javax.servlet.http.HttpServlet#service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
  */
protected void service(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
  //首先设置页面不缓存
  response.setHeader("Pragma", "No-cache");
  response.setHeader("Cache-Control", "No-cache");
  response.setDateHeader("Expires",0);
  //定义图片的宽度和高度
  int width = 90;
  int height = 30;
  //创建一个图片对象
  BufferedImage image= new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
  //得到图像的环境对象
  Graphics g = image.createGraphics();
  //用随机颜色填充图像背景
  Random random = new Random();
  g.setColor(getColor(180,250));
  g.fillRect(0, 0, width, height);
  for(int i=0; i< 5; i++)
  {
   g.setColor(getColor(50,100));
   int x = random.nextInt(width);
   int y = random.nextInt(height);
   g.drawOval(x, y, 4, 4);
  }
 
  g.setFont(new Font("",Font.PLAIN,28));
  //生成随机字符串
  String sRand = "";
  for(int i = 0; i< 4; i++)
  {
   String rand = String.valueOf(random.nextInt(10));
   sRand += rand;
   //生成随机颜色
   g.setColor(new Color(20+random.nextInt(80),20+random.nextInt(100),20+random.nextInt(90)));
   g.drawString(sRand,15,25);
   //生成干扰向
   for(int j=0;j<12;j++)
   {
    int x = random.nextInt(width);
    int y = random.nextInt(height);
    int x1 = random.nextInt(9);
    int y1 = random.nextInt(9);
    g.drawLine(x, y, x+x1, y+y1);
   }
  }
  request.getSession().setAttribute("randCode",sRand);
  //使画像生成
  g.dispose();
  //输出图形到页面
  ImageIO.write(image, "jpg", response.getOutputStream());
}

/**
  * 产生一个随机的颜色
  * @return
  */
public Color getColor(int fc,int bc)
{
  Random random = new Random();
  if(fc > 255)
  {
   fc = 255;
  }
  if(bc > 255)
  {
   bc = 255;
  }
 
  int red = fc + random.nextInt(bc - fc);
  int green = fc + random.nextInt(bc - fc);
  int blue = fc + random.nextInt(bc - fc);
 
  return new Color(red,green,blue);
}
public void init() throws ServletException {
 
}



}