springboot项目实战之获取微信JSDK签名信息

目标

现实项目的需要，需要获取微信jssdk签名信息

步骤

1.  初始化配置信息

public Map initJSSDKConfigInfo(String shareUrl) throws Exception {
        //String accessToken = this.getAccessToken();
        String jsapiTicket = this.getJsApiTicket();
        String timestamp = Long.toString(System.currentTimeMillis() / 1000);
        String nonceStr = UUID.randomUUID().toString();
        String signature = this.buildJSSDKSignature(jsapiTicket,timestamp,nonceStr,shareUrl);

        Map map = new HashMap();
        map.put("shareUrl", shareUrl);
        map.put("jsapi_ticket", jsapiTicket);
        map.put("nonceStr", nonceStr);
        map.put("timestamp", timestamp);
        map.put("signature", signature);
        map.put("appid", WeChatConfig.appId);
        return map;
    }

2. ticket信息获取

private String getJsApiTicket() {
        String jsApiTicket =redisCache.getCacheObject(JS_API_TICKET);
        if (!StrUtil.isNotEmpty(jsApiTicket)){
            //获取全局的access_token，唯一票据
            String accessToken = redisCache.getCacheObject(ACCESS_TOKEN_KEY);
            //log.info("getJsApiTicket"+accessToken);
            if (StringUtils.isNotBlank(accessToken)) {
                //获取jsapi_ticket
                String url = WeChatConfig.getTicketUrl+"access_token="+accessToken+"&type=jsapi";
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_JSON);
                //请求
                RestTemplate restTemplate = new RestTemplate();
                HttpEntity request = new HttpEntity<>(headers);
                ResponseEntity responseString = restTemplate.postForEntity(url, request, String.class);
                JSONObject json = JSONObject.parseObject(responseString.getBody());
                jsApiTicket = json.getString("ticket");
                redisCache.setCacheObject(JS_API_TICKET, jsApiTicket, 115, TimeUnit.MINUTES);
            }else {
                //access为空打印
                log.info("accessToken","重新获取");
                this.creatAccessToken();
                accessToken = redisCache.getCacheObject(ACCESS_TOKEN_KEY);
                String url = WeChatConfig.getTicketUrl+"access_token="+accessToken+"&type=jsapi";
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_JSON);
                //请求
                RestTemplate restTemplate = new RestTemplate();
                HttpEntity request = new HttpEntity<>(headers);
                ResponseEntity responseString = restTemplate.postForEntity(url, request, String.class);
                JSONObject json = JSONObject.parseObject(responseString.getBody());
                jsApiTicket = json.getString("ticket");
                redisCache.setCacheObject(JS_API_TICKET, jsApiTicket, 115, TimeUnit.MINUTES);

            }
        }
        log.info("getJsApiTicket jsApiTicket: {}", jsApiTicket);
        return jsApiTicket.trim();
    }

3. 信息处理封装

public static String buildJSSDKSignature(String ticket,String timestamp,String nonceStr ,String url) throws Exception {

        String orderedString = "jsapi_ticket=" + ticket
                + "&noncestr=" + nonceStr + "×tamp=" + timestamp
                + "&url=" + url;
        return sha1(orderedString);
    }
    public static String sha1(String orderedString) throws Exception {
        String ciphertext = null;
        MessageDigest md = MessageDigest.getInstance("SHA-1");
        byte[] digest = md.digest(orderedString.getBytes());
        ciphertext = byteToStr(digest);
        return ciphertext.toLowerCase();
    }
    private static String byteToStr(byte[] byteArray) {
        String strDigest = "";
        for (int i = 0; i < byteArray.length; i++) {
            strDigest += byteToHexStr(byteArray[i]);
        }
        return strDigest;
    }
    private static String byteToHexStr(byte mByte) {
        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        char[] tempArr = new char[2];
        tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
        tempArr[1] = Digit[mByte & 0X0F];

        String s = new String(tempArr);
        return s;
    }

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