利用patchca生成验证码

你的名字 2022-09-30 00:55 132阅读 0赞

patchca 是一个简单但功能强大的验证码的Java类库。 
    在springMVC 中的使用

/**
         * 验证码
         *
         * @param width  图片宽度
         * @param height 图片高度
         * @param number 验证码数量
         */
        @RequestMapping(value = {"/captcha?w={width}&h={height}&n={number}"})
        public void captcha(HttpServletRequest request,
                            HttpServletResponse response, @PathVariable int width, @PathVariable int height, @PathVariable int number) throws IOException {
            ConfigurableCaptchaService cs = new ConfigurableCaptchaService();
            cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170)));
            cs.setFilterFactory(new CurvesRippleFilterFactory(cs.getColorFactory()));
            RandomFontFactory ff = new RandomFontFactory();
            ff.setMinSize(30);
            ff.setMaxSize(30);
            RandomWordFactory rwf = new RandomWordFactory();
            rwf.setMinLength(number);
            rwf.setMaxLength(number);
            cs.setWordFactory(rwf);
            cs.setFontFactory(ff);
            cs.setHeight(height);
            cs.setWidth(width);
    
            response.setContentType("image/png");
            response.setHeader("Cache-Control", "no-cache, no-store");
            response.setHeader("Pragma", "no-cache");
            long time = System.currentTimeMillis();
            response.setDateHeader("Last-Modified", time);
            response.setDateHeader("Date", time);
            response.setDateHeader("Expires", time);
            
            ServletOutputStream stream = response.getOutputStream();
            String validate_code = EncoderHelper.getChallangeAndWriteImage(cs,
                    "png", stream);
    
            request.getSession().setAttribute("REG_VAL_CODE", validate_code);
    
            stream.flush();
            stream.close();
        }
    jar下载地址：http://code.google.com/p/patchca/downloads/list 
    源码下载地址：https://github.com/pusuo/patchca