基于spring mvc的图片验证码,分后台代码和前端页面的展现以及验证码的验证。

首看后台实现代码:

@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();

    }
创建生成颜色的方法
//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);
    }

前端代码
<form action="toLogin.do" id="loginUser" method="post">
    <div class="form-group">
        姓名:<input id="name" name="name" type="text"/>
    </div>
    <div class="form-group">
        密码:<input id="password" name="password" type="password"/>
    </div>
    <div class="form-group">
        验证码:<input id="authCode" name="authCode" type="text"/>
        <!--这里img标签的src属性的值为后台实现图片验证码方法的请求地址-->
        <label><img type="image" src="authCode.do" id="codeImage" onclick="chageCode()" title="图片看不清?点击重新得到验证码" style="cursor:pointer;"/></label>
        <label><a onclick="chageCode()">换一张</a></label>
    </div>
    <input type="button" class="btn btn-default"  onclick="subm()" value="登录"/>
</form>

实现点击图片更换验证码的js方法

function chageCode(){
        $('#codeImage').attr('src','authCode.do?abc='+Math.random());//链接后添加Math.random,确保每次产生新的验证码,避免缓存问题。
    }


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转载自blog.csdn.net/u013836676/article/details/79604641
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