精品验证码

package com.b2c.action;

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

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

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.springframework.stereotype.Component;


public class DrawImagteCodeAction {

     private Color getRandColor(int s, int e) {  
            Random random = new Random();  
            if (s > 255)  
                s = 255;  
            if (e > 255)  
                e = 255;  
            int r = random.nextInt(e - s) + s; // 随机生成RGB中的R值  
            int g = random.nextInt(e - s) + s; // 随机生成RGB中的G值  
            int b = random.nextInt(e - s) + s; // 随机生成RGB中的B值  
            return new Color(r, g, b);  
        }

         @Action(value="load_getCode")
         public void getCode() throws IOException{  
            HttpServletResponse response = ServletActionContext.getResponse();
            response.setHeader("Pragma", "No-cache");  
            response.setHeader("Cache-Control", "No-cache");  
            response.setDateHeader("Expires", 0);  
            //指定生成的响应图片  
            response.setContentType("image/jpeg");  
            int width = 90;                            //指定生成验证码图片的宽度  
            int heigh = 65;                         //指定生成验证码图片的高度  
                //获得图像数据缓冲对象  
            BufferedImage bi = new BufferedImage(width,heigh,BufferedImage.TYPE_INT_RGB);  
                //获得图形上下文的抽象基类  
            Graphics g = bi.getGraphics();  
            Random r = new Random();  
            Font f = new Font("黑体",Font.PLAIN,60);  //定义字体样式  
            g.setColor(getRandColor(200, 250));     //设置背景颜色  
            g.fillRect(0, 0, width, heigh);         //绘制背景  
            g.setFont(f);                           //设置字体  
            g.setColor(getRandColor(180, 200));     //设置前景颜色  
              
              
            Graphics2D g2d = (Graphics2D) g;  
            //画一条折线       
            //BasicStroke bs=new BasicStroke(5f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //创建一个供画笔选择线条粗细的对象  
            //g2d.setStroke(bs);              //改变线条的粗细  
            g2d.setColor(Color.DARK_GRAY);      //设置当前颜色为预定义颜色中的深灰色  
            int[] xPoints=new int[8];  
            int[] yPoints=new int[8];  
            for(int j=0;j<8;j++){  
                xPoints[j]=r.nextInt(width - 1);  
                yPoints[j]=r.nextInt(heigh - 1);  
            }  
            g2d.drawPolyline(xPoints, yPoints,4);  
              
            String sRand = "";  
            String ctmp = "";  
            int itmp = 0;  
            for (int i = 0; i < 4; i++) {  
                switch (r.nextInt(2)) {  
                case 1:  
                    itmp = r.nextInt(26) + 65; // 生成A~Z的字母  
                    ctmp = String.valueOf((char) itmp);  
                    break;  
                default:  
                    itmp = r.nextInt(10) + 48; // 生成0~9的数字  
                    ctmp = String.valueOf((char) itmp);  
                    break;  
                }  
                sRand += ctmp;  
                //设置每个字符的随机颜色  
                Color color = new Color(20 + r.nextInt(210), 20 + r.nextInt(210), 20 + r.nextInt(210));  
                g2d.setColor(color);  
                //设置每个字符的随机字体  
                g2d.setFont(this.getRandomFont());  
                //设置每个字符的随机旋转  
                AffineTransform at = new AffineTransform();  
                int number = r.nextInt(3)-1;  
                double role = number*r.nextDouble()*(Math.PI/4);  
                at.setToRotation(role,25*i+5,55-r.nextInt(20)); //role:旋转角度,后面两个参数是设置围绕坐标点旋转  
                g2d.setTransform(at);  
                  
                g2d.drawString(ctmp, 20*i+5,50-r.nextInt(10));  
            }  
               HttpSession session = ServletActionContext.getRequest().getSession(true);  
               session.setMaxInactiveInterval(5*60);//设置session对象5分钟失效  
               session.setAttribute("code", sRand.toString());  
      
               g2d.dispose();  
      
                ImageIO.write(bi, "JPEG", response.getOutputStream());
        }  
          
         
         public static Font getRandomFont() {    
                //String[] fonts = {"Georgia", "Verdana", "Arial", "Tahoma", "Time News Roman", "Courier New", "Arial Black", "Quantzite"};    
                String[] fonts = {"a_TrianglerCmUp","Astarisborn","WishfulWaves"};  
                Random r = new  Random();  
               int fontIndex = r.nextInt(fonts.length);  
                return new Font(fonts[fontIndex],  r.nextInt(3),50-r.nextInt(20));    
         }  
}