英文，数字和中文混合的彩色验证码实现

原文：http://blog.csdn.net/huangshulang1234/article/details/51776806

 @Action("/getCode1")
    public void getCode1() throws IOException{
        // TODO Auto-generated method stub  
        //设置不缓存图片  
        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=86;           //指定生成验证码的宽度  
        int height=22;          //指定生成验证码的高度  
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
        Graphics g = image.getGraphics();  
        Graphics2D g2d = (Graphics2D)g;             //创建Graphics2D对象  
        Random random = new Random();  
        Font mFont = new Font("黑体", Font.BOLD, 16); //定义字体样式  
        g.setColor(getRandColor(200, 250));  
        g.fillRect(0, 0, width, height);        //绘制背景  
        g.setFont(mFont);                       //设置字体  
        g.setColor(getRandColor(180, 200));  
          
          
        //绘制100根位置和颜色全部为随机产生的线条，该线条为2f  
        for (int i = 0; i < 100; i++) {  
            int x = random.nextInt(width-1);  
            int y = random.nextInt(height-1);  
            int x1 = random.nextInt(6)+1;  
            int y1 = random.nextInt(12)+1;  
            BasicStroke bs = new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);  
            Line2D line = new Line2D.Double(x,y,x+x1,y+y1);  
            g2d.setStroke(bs);  
            g2d.draw(line);             //绘制直线  
              
        }  
          
          
        //输出由英文，数字和中文随机组成的验证文字，具体的组合方式根据生成随机数确定  
        String sRand = "";  
        //输出随机的验证文字  
        String ctmp = "";  
        int itmp = 0;  
        for(int i = 0;i<4;i++){  
            //random = new Random(new java.util.Date().getTime()+i);  
            switch (random.nextInt(4)) {  
            case 1:  
                itmp = random.nextInt(26)+65;               //生成A~Z的字母  
                ctmp = String.valueOf((char)itmp);  
                  
                break;  
  
            case 2://生成汉字  
                String[] rBase = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};  
                //生成第一位的区码  
                int r1 = random.nextInt(3)+11;              //生成11~14之间的随机数  
                String str_r1 = rBase[r1];  
                //生成第二位的区码  
                int r2;  
                if(r1==13){  
                    r2 = random.nextInt(7);             //生成0~7之间的随数  
                }else{  
                    r2 = random.nextInt(16);            //生成0~16之间的随机数  
                }  
                String str_r2 = rBase[r2];  
                //生成第一位的位码  
                int r3 = random.nextInt(6)+10;          //生成10~16之间的随机数  
                String str_r3 = rBase[r3];  
                //生成第二位的位码  
                int r4;  
                if(r3==10){  
                    r4 = random.nextInt(15)+1;          //生成1~16之间的随机数  
                      
                }else if(r3==15){  
                    r4 = random.nextInt(15);            //生成0~15之间的随机数  
                }else {  
                    r4 = random.nextInt(16);            //生成0~16之间的随机数  
                              
                }  
                String str_r4 = rBase[r4];  
                //将生成的机内码转换为汉字  
                byte[] bytes = new byte[2];  
                //将生成的区码保存到字节数组的第一个元素中  
                String str_r12 = str_r1+str_r2;  
                int tempLow=Integer.parseInt(str_r12,16);  
                bytes[0] = (byte)tempLow;  
                //将生成的位码保存到字节数组的第二个元素中  
                String str_r34 = str_r3+str_r4;  
                int tempHigh = Integer.parseInt(str_r34,16);  
                bytes[1] = (byte)tempHigh;  
                ctmp = new String(bytes);           //根据字节数组生成汉字  
                break;  
            default:  
                itmp = random.nextInt(10)+48;       //生成0~9的数字  
                ctmp = String.valueOf((char)itmp);  
                break;  
            }  
            sRand+=ctmp;  
            Color color = new Color(20+random.nextInt(110), 20+random.nextInt(110), 20+random.nextInt(110));  
            g.setColor(color);  
              
            //将生成的随机数进行随机缩放病旋转指定角度  
            //将文字旋转指定角度  
            Graphics2D g2d_word = (Graphics2D)g;  
            AffineTransform trans = new AffineTransform();  
            trans.rotate(random.nextInt(45)*3.14/180,15*i+8,7);  
            //缩放文字  
            float scaleSize = random.nextFloat()+0.8f;  
            if(scaleSize>1f){  
                scaleSize = 1f;  
            }  
            trans.scale(scaleSize, scaleSize);  
            g2d_word.setTransform(trans);  
            g.drawString(ctmp, 15*i+18, 14);  
        }  
          
        //将生成的验证码保存道session中  
        HttpSession session = request.getSession(true);  
        session.setAttribute("randCheckCode", sRand);  
          
        //输出生成的验证码图片  
        g.dispose();  
        ImageIO.write(image, "JPEG", response.getOutputStream());  
    }  
  
  
    public Color getRandColor(int s,int e){  
        Random random = new Random();  
        if(s>255)s = 255;  
        if(e>255)e = 255;  
        int r = s+random.nextInt(e-s);  
        int g = s+random.nextInt(e-s);  
        int b = s+random.nextInt(e-s);  
        return new Color(r, g, b);  
    }