开源patchca验证码使用总结

pom.xml

<!-- 验证码 -->
        <dependency>
            <groupId>com.github.bingoohuang</groupId>
            <artifactId>patchca</artifactId>
            <version>0.0.1</version>
        </dependency>

jsp:

<div >
     验证码：<input type="text" style="width: 150px;height: 20px;" class="authod" name="authcode" id="authcode"></input>                
          <img id="validationCode" alt="验证码图片" title="验证码图片" src="<%=path %>/pcrimg" onclick="refreshCode(this)" />  
              <a id="aRecode" href="javascript:void(0);" onclick="refreshCode()">看不清，换一张</a>  
</div>

js:

function refreshCode(imgObj) {  

        if (!imgObj) {  

            imgObj = document.getElementById("validationCode");  

        }  

        var index = imgObj.src.indexOf("?");  

        if(index != -1) {  

            var url = imgObj.src.substring(0,index + 1);  

            imgObj.src = url + Math.random();  

        } else {  

            imgObj.src = imgObj.src + "?" + Math.random();  

        }  

    }  

后台代码：

// 验证码处理器工厂
    private static ConfigurableCaptchaService cs = new ConfigurableCaptchaService();
    private static Random random = new Random();
    static {
        
        cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170)));
        cs.setColorFactory(new ColorFactory() {
            public Color getColor(int x) {
                int[] c = new int[3];
                int i = random.nextInt(c.length);
                for (int fi = 0; fi < c.length; fi++) {
                    if (fi == i) {
                        c[fi] = random.nextInt(71);
                    } else {
                        c[fi] = random.nextInt(256);
                    }
                }
                return new Color(c[0], c[1], c[2]);
            }
        });
        // 生成的单词设置
        RandomWordFactory wf = new RandomWordFactory();
        wf.setCharacters("23456789abcdefghigkmnpqrstuvwxyzABCDEFGHIGKLMNPQRSTUVWXYZ");
        wf.setMaxLength(4);
        wf.setMinLength(4);
        cs.setWordFactory(wf);
    }

@RequestMapping("/pcrimg")
    public void crimg(HttpServletRequest request, HttpServletResponse response) throws IOException {
        switch (random.nextInt(5)) {
            case 0:
                cs.setFilterFactory(new CurvesRippleFilterFactory(cs.getColorFactory()));
                break;
            case 1:
                cs.setFilterFactory(new MarbleRippleFilterFactory());
                break;
            case 2:
                cs.setFilterFactory(new DoubleRippleFilterFactory());
                break;
            case 3:
                cs.setFilterFactory(new WobbleRippleFilterFactory());
                break;
            case 4:
                cs.setFilterFactory(new DiffuseRippleFilterFactory());
                break;
        }
        HttpSession session = request.getSession(false);
        if (session == null) {
            session = request.getSession();
        }
        setResponseHeaders(response);
        
        String token = EncoderHelper.getChallangeAndWriteImage(cs, "png", response.getOutputStream());
        session.setAttribute("captchaToken", token);
        System.out.println("当前的SessionID=" + session.getId() + "，验证码=" + token);
    }
    

    protected void setResponseHeaders(HttpServletResponse response) {
        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);
    }