获取验证码和校验登陆验证码

来源：互联网发布：ab淘宝旗舰店网址编辑：程序博客网时间：2024/06/05 03:51

设置项目编码 utf-8
<%@ page language=”java” contentType=”text/html; charset=UTF-8” pageEncoding=”UTF-8”%>
在控制层类上加入

@SessionAttributes(value={"randImage"})

/***     * 获取验证码     * @param model     * @param response     */    @RequestMapping(value="/getRandCode",method = RequestMethod.GET)    public void getRandCode(ModelMap model,HttpServletResponse response){        try {            model.addAttribute("randImage",userService.writeImg(response.getOutputStream()));        } catch (IOException e) {            e.printStackTrace();        }    }

<span><img id="randImage" src="${contextPath}/login/getRandCode?id=<%=System.currentTimeMillis()%>" alt="看不清,换一个" /></span>

service层方法

/*     * 产生验证码     */    public String writeImg(OutputStream stream) {        // 设置图形大小。        int width = 86, height = 24;        // 建立图形缓冲区。        BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);        Graphics g = image.getGraphics();// 获得 Graphics 对象。        g.setColor(getRandomColor(180, 240));// 设置背景色。        g.fillRect(0, 0, width, height);// 填充背景。        StringBuilder validationCode = new StringBuilder();// 用于保存最后的验证码        String[] fontNames = {"微软雅黑"};// 用于随机的字体的集合        Random r = new Random();        // 随机生成4个验证码        for (int i = 0; i < 4; i++) {            g.setFont(new Font(fontNames[0], Font.PLAIN, height-4));            char codeChar = codeChars.charAt(r.nextInt(codeChars.length()));            validationCode.append(codeChar);            g.setColor(getRandomColor(40, 60));            g.drawString(String.valueOf(codeChar), 20 * i + r.nextInt(5),height - 4);// 在图形上输出验证码        }        // 随机生干扰码        for (int i = 0; i < 30; i++) {            g.setColor(getRandomColor(100, 200));            int x = r.nextInt(width);            int y = r.nextInt(height);            g.drawLine(x, y, x + r.nextInt(10), y + r.nextInt(5));        }        g.dispose();// 关闭Graphics对象        OutputStream os = stream;// 得到输出流        try {            ImageIO.write(image, "JPEG", os);        } catch (IOException e) {            e.printStackTrace();        }// 以JPEG格式向客户端发送图形验证码        return validationCode.toString();    }    /**     * 产生随机的颜色     *      * @param minColor     * @param maxColor     * @return     */    private static Color getRandomColor(int minColor, int maxColor) {        Random r = new Random();        int red = minColor + r.nextInt(maxColor - minColor);        int green = minColor + r.nextInt(maxColor - minColor);        int blue = minColor + r.nextInt(maxColor - minColor);        return new Color(red, green, blue);    }

Logincontroller

/***     * 检查图片验证码是否相等     * @param randImage     * @param inputRandCode     * @return     */    @RequestMapping(value="/checkRandCode",method = RequestMethod.GET)    @ResponseBody    public boolean checkRandCode(@ModelAttribute("randImage") String randImage,String inputRandCode){        if(randImage.equalsIgnoreCase(inputRandCode)){            return true;        }        return false;    }

loginController 在登陆时候的校验

//验证码        if(!checkRandCode(randImage,randCode)){            model.addAttribute("authCodeError", "验证码不正确！");            return "admin/login";        }

var $randImage = $("img[id=randImage]");//验证码图片$randImage.click(function(){        $randCode.val("");        $randImage.attr("src",getRootPath()+"/login/getRandCode?id="+Math.random());    });

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