Java Web显示图片验证码

来源：互联网发布：deandre ayton体测数据编辑：程序博客网时间：2024/05/19 04:51

@RequestMapping({"authCode"})    public void getAuthCode(HttpServletRequest request, HttpServletResponse response,HttpSession session)            throws IOException {        int width = 63;        int height = 37;        Random random = new Random();        //设置response头信息        //禁止缓存        response.setHeader("Pragma", "No-cache");        response.setHeader("Cache-Control", "no-cache");        response.setDateHeader("Expires", 0);        //生成缓冲区image类        BufferedImage image = new BufferedImage(width, height, 1);        //产生image类的Graphics用于绘制操作        Graphics g = image.getGraphics();        //Graphics类的样式        g.setColor(this.getRandColor(200, 250));        g.setFont(new Font("Times New Roman",0,28));        g.fillRect(0, 0, width, height);        //绘制干扰线        for(int i=0;i<40;i++){            g.setColor(this.getRandColor(130, 200));            int x = random.nextInt(width);            int y = random.nextInt(height);            int x1 = random.nextInt(12);            int y1 = random.nextInt(12);            g.drawLine(x, y, x + x1, y + y1);        }        //绘制字符        String strCode = "";        for(int i=0;i<4;i++){            String rand = String.valueOf(random.nextInt(10));            strCode = strCode + rand;            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));            g.drawString(rand, 13*i+6, 28);        }        //将字符保存到session中用于前端的验证        session.setAttribute("strCode", strCode);        g.dispose();        ImageIO.write(image, "JPEG", response.getOutputStream());        response.getOutputStream().flush();    }

//创建颜色    Color getRandColor(int fc,int bc){        Random random = new Random();        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);    }

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