微信jssdk 返回的 config invalid signature

这几天一直在调试wxjssdk，按照api的需求，http://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html ，先是根据appid和秘钥获取access_token并存入缓存：注意的是此处的appid 和秘钥是微信公众平台的appid(区别于微信开放平台，开放平台无法设置域名)。

public final String sharing(String url, HttpServletResponse response) {
        StringBuilder stringBuilder = new StringBuilder();
        Map<String,String> resMap = new HashMap<String, String>();
        //返回给app端
        net.sf.json.JSONObject jb = new net.sf.json.JSONObject();
        net.sf.json.JSONObject data = new net.sf.json.JSONObject();
        try {
            if (url.contains("#")){
                url = url.substring(0,url.indexOf("#")); //不需要获取后面的#的内容
            }
            Map<String,String> ecPaymentMap = myPayService.findPaymentTypeListInfo(PAYMENT_TYPE_ID);
            String accessToken = cacheUtil.readCache("access_token"); //获取token
            if (StringUtil.isEmpty(accessToken)){
                Map<String,String> getTokenMap = new HashMap<String, String>();
                getTokenMap.put("grant_type","client_credential"); //获取access_token填写client_credential
                getTokenMap.put("appid", ecPaymentMap.get("appId")); //第三方用户唯一凭证
                getTokenMap.put("secret",ecPaymentMap.get("appKey")); //第三方用户唯一凭证密钥，
                String resTokenData = HttpClientTools.doGet(WXURLConstant.ACCESSTOKENURL, getTokenMap);
                if (StringUtil.isEmpty(resTokenData)){
                    logger.error("WXJs Token is null");
                    throw new RuntimeException();
                }
                JSONObject jsonObject = JSONObject.parseObject(resTokenData);
                logger.info("WXJs resData" + jsonObject);

                if (jsonObject.get("access_token") !=null){
                    cacheUtil.setCache("access_token",jsonObject.get("access_token").toString(),Integer.valueOf(jsonObject.get("expires_in").toString()));
                }else {
                    logger.error("get WXJs token error,errorCode: " + jsonObject.get("errcode"));
                }
                accessToken=cacheUtil.readCache("access_token");
            }
            String jsapiTicket = cacheUtil.readCache("jsapiTicket"); //获取jsapiTicket
            if (StringUtil.isEmpty(jsapiTicket)){
                Map<String,String> map = new HashMap<String, String>(); //请求获取JS-SDK使用权限签名算法
                map.put("access_token",accessToken); //请求参数access_token
                map.put("type","jsapi"); //请求参数type 固定
               String ticketResData = HttpClientTools.doGet(WXURLConstant.JSAPITICKET, map);
                if (StringUtil.isEmpty(ticketResData)){
                    logger.error("requestData is null");
                    return null;
                }
                JSONObject jsonObject = JSONObject.parseObject(ticketResData);

                if (!"0".equals(jsonObject.get("errcode").toString())){
                    logger.error("WX get jsapiTicket error" + jsonObject.toString());
                    jb.element("status", 002);
                    jb.element("msg", "jsapi error");
                    data.element("data",jsonObject);
                    jb.put("data",data);
                    stringBuilder.append(jb);
                    response.resetBuffer();
                    response.setContentType("text/html;charset=UTF-8");
                    response.getWriter().print(stringBuilder);
                    response.getWriter().flush();
                    response.getWriter().close();
                    response.flushBuffer();
                    return stringBuilder.toString();
                }
                cacheUtil.setCache("jsapiTicket",jsonObject.get("ticket").toString(),WXJSSDKConstant.EXPIRETIME); //缓存2个小时 其实有自动任务一个小时会执行一次 防止过期
                jsapiTicket = jsonObject.get("ticket").toString();
            }
            String timestamp = String.valueOf(System.currentTimeMillis()/1000);
            String nonceStr = TenpayUtil.getNonceStr();
            Map<String,String> requestSignMap = new HashMap<String, String>(); //后去signature
            requestSignMap.put("noncestr", nonceStr);
            requestSignMap.put("jsapi_ticket",jsapiTicket);
            requestSignMap.put("timestamp",timestamp);
            requestSignMap.put("url",url);
            String signature = "";
            try {
                signature = WXUtil.sha1Sign(requestSignMap);
            } catch (JDOMException e) {
                e.printStackTrace();
            }

            //增加签名
            jb.element("status", 0);
            jb.element("msg", "OK");
            resMap.put("appId", ecPaymentMap.get("appId"));
            resMap.put("timestamp", timestamp);
            resMap.put("nonceStr", nonceStr);
            resMap.put("signature", signature);
            data.element("data",resMap);
            jb.element("data", data);
            stringBuilder.append(jb.toString());
            response.resetBuffer();
            response.setContentType("text/html;charset=UTF-8");
            response.getWriter().print(stringBuilder.toString());
            response.getWriter().flush();
            response.getWriter().close();
            response.flushBuffer();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return stringBuilder.toString();
    }

第二步是根据acces_token获取jsapi_ticket并存入缓存，注意此处的参数type要是jsapi,还有一个获取卡卷的接口，此处容易出错

第三部就是根据jsapiticket 来获取signature，参数主要是16位随机数，ticket 时间串（注意此处的格式是秒） url (注意路径：传递的时候需要转码，后台后去的时候需要解码，这个一定要注意了，好多人在这上面被坑的。。。)

noncestr

jsapi_ticket

timestamp

url
第四步 把获得的结果传到前台即可



遇到的问题，主要是 报这个 config invalid signature

用jsskd自带的签名工具验签发现没有问题，但是无论如何就是报签名错误。然后google了好多，最后发现原来是url的问题：前端需要转码需要转码需要转码，后台需要解码需要解码需要解码。

前端:url在JavaScript中千万别忘记“encodeURIComponent”！

url在JavaScript中千万别忘记“encodeURIComponent”！

后台：

public String sharing(HttpServletRequest request, HttpServletResponse response){
        String url = request.getParameter("url"); //分享链接url
        try {
            logger.info("beforeDecode:" + url);
            url = URLDecoder.decode(url,"utf-8");
            logger.info("afterEncode:" + url);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return wXSharingService.sharing(url,response);
    }