java 超经漂亮验证码

 package com.zly.xsp.image;

 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Random;

 import javax.imageio.ImageIO;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;

 public class CreateImageCode {
     // 图片的宽度。
     private int width = 160;
     // 图片的高度。
     private int height = 40;
     // 验证码字符个数
     private int codeCount = 4;
     // 验证码干扰线数
     private int lineCount = 20;
     // 验证码
     private String code = null;
     // 验证码图片Buffer
     private BufferedImage buffImg = null;
     Random random = new Random();

     public CreateImageCode() {
         creatImage();
     }

     public CreateImageCode(int width, int height) {
         this.width = width;
         this.height = height;
         creatImage();
     }

     public CreateImageCode(int width, int height, int codeCount) {
         this.width = width;
         this.height = height;
         this.codeCount = codeCount;
         creatImage();
     }

     public CreateImageCode(int width, int height, int codeCount, int lineCount) {
         this.width = width;
         this.height = height;
         this.codeCount = codeCount;
         this.lineCount = lineCount;
         creatImage();
     }

     // 生成图片
     private void creatImage() {
         int fontWidth = width / codeCount;// 字体的宽度
         int fontHeight = height - 5;// 字体的高度
         int codeY = height - 8;

         // 图像buffer
         buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
         Graphics g = buffImg.getGraphics();
         //Graphics2D g = buffImg.createGraphics();
         // 设置背景色
         g.setColor(getRandColor(200, 250));
         g.fillRect(0, 0, width, height);

         // 设置字体
         //Font font1 = getFont(fontHeight);
         Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
         g.setFont(font);

         // 设置干扰线
         for (int i = 0; i < lineCount; i++) {
             int xs = random.nextInt(width);
             int ys = random.nextInt(height);
             int xe = xs + random.nextInt(width);
             int ye = ys + random.nextInt(height);
             g.setColor(getRandColor(1, 255));
             g.drawLine(xs, ys, xe, ye);
         }

         // 添加噪点
         float yawpRate = 0.01f;// 噪声率
         int area = (int) (yawpRate * width * height);
         for (int i = 0; i < area; i++) {
             int x = random.nextInt(width);
             int y = random.nextInt(height);

             buffImg.setRGB(x, y, random.nextInt(255));
         }

         String str1 = randomStr(codeCount);// 得到随机字符
         this.code = str1;
         for (int i = 0; i < codeCount; i++) {
             String strRand = str1.substring(i, i + 1);
             g.setColor(getRandColor(1, 255));
             // g.drawString(a,x,y);
             // a为要画出来的东西，x和y表示要画的东西最左侧字符的基线位于此图形上下文坐标系的 (x, y) 位置处

             g.drawString(strRand, i*fontWidth+3, codeY);
         }

     }

     // 得到随机字符
     private String randomStr(int n) {
         String str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
         String str2 = "";
         int len = str1.length() - 1;
         double r;
         for (int i = 0; i < n; i++) {
             r = (Math.random()) * len;
             str2 = str2 + str1.charAt((int) r);
         }
         return str2;
     }

     // 得到随机颜色
     private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
         if (fc > 255)
             fc = 255;
         if (bc > 255)
             bc = 255;
         int r = fc + random.nextInt(bc - fc);
         int g = fc + random.nextInt(bc - fc);
         int b = fc + random.nextInt(bc - fc);
         return new Color(r, g, b);
     }

     /**
      * 产生随机字体
      */
     private Font getFont(int size) {
         Random random = new Random();
         Font font[] = new Font[5];
         font[0] = new Font("Ravie", Font.PLAIN, size);
         font[1] = new Font("Antique Olive Compact", Font.PLAIN, size);
         font[2] = new Font("Fixedsys", Font.PLAIN, size);
         font[3] = new Font("Wide Latin", Font.PLAIN, size);
         font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, size);
         return font[random.nextInt(5)];
     }

     // 扭曲方法
         private void shear(Graphics g, int w1, int h1, Color color) {
             shearX(g, w1, h1, color);
             shearY(g, w1, h1, color);
         }

         private void shearX(Graphics g, int w1, int h1, Color color) {

             int period = random.nextInt(2);

             boolean borderGap = true;
             int frames = 1;
             int phase = random.nextInt(2);

             for (int i = 0; i < h1; i++) {
                 double d = (double) (period >> 1)
                         * Math.sin((double) i / (double) period
                                 + (6.2831853071795862D * (double) phase)
                                 / (double) frames);
                 g.copyArea(0, i, w1, 1, (int) d, 0);
                 if (borderGap) {
                     g.setColor(color);
                     g.drawLine((int) d, i, 0, i);
                     g.drawLine((int) d + w1, i, w1, i);
                 }
             }

         }

         private void shearY(Graphics g, int w1, int h1, Color color) {

             int period = random.nextInt(40) + 10; // 50;

             boolean borderGap = true;
             int frames = 20;
             int phase = 7;
             for (int i = 0; i < w1; i++) {
                 double d = (double) (period >> 1)
                         * Math.sin((double) i / (double) period
                                 + (6.2831853071795862D * (double) phase)
                                 / (double) frames);
                 g.copyArea(i, 0, 1, h1, 0, (int) d);
                 if (borderGap) {
                     g.setColor(color);
                     g.drawLine(i, (int) d, i, 0);
                     g.drawLine(i, (int) d + h1, i, h1);
                 }

             }

         }

     public void write(OutputStream sos) throws IOException {
         ImageIO.write(buffImg, "png", sos);
         sos.close();
     }

     public BufferedImage getBuffImg() {
         return buffImg;
     }

     public String getCode() {
         return code.toLowerCase();
     }

     //使用方法
  /*public void getCode3(HttpServletRequest req, HttpServletResponse response,HttpSession session) throws IOException{
         // 设置响应的类型格式为图片格式
             response.setContentType("image/jpeg");
             //禁止图像缓存。
             response.setHeader("Pragma", "no-cache");
             response.setHeader("Cache-Control", "no-cache");
             response.setDateHeader("Expires", 0);

             CreateImageCode vCode = new CreateImageCode(100,30,5,10);
             session.setAttribute("code", vCode.getCode());
             vCode.write(response.getOutputStream());
      }*/

 }