获取微信签名

微信开发----配置权限获取签名

url

@POST
    @Path("getJsApi")
    public DataCenter<Object> getJsApi(String url){
        DataCenter<Object> netData = new DataCenter<Object>();
        String times = Long.toString(System.currentTimeMillis()/1000);
        String nonceStr = PropertiesUtil.get("weChat.nonceStr");
        String jsapi = WeChatUtil.getJSSignature(nonceStr,times,url);
        int i =jsapi.lastIndexOf("@");
        String signature = jsapi.substring(0, i);
        String timeOut = jsapi.substring(i+1, jsapi.length());
        Map<String,Object> map = new HashMap<>();
        map.put("appId", Constant.WECHAT_APPID);
        map.put("signature", signature);
        map.put("timeOut", timeOut);
        map.put("timestamp", times);
        map.put("nonceStr", nonceStr);
        netData.setData(map);
        return netData;
    }

获取js签名

 /** 
     * 获得js授权的签名信息 
     * @throws UnsupportedEncodingException 
     *  
     */  
    public static String getJSSignature(String noncestr, String timestamp, String url){  
        StringBuilder content = new StringBuilder();  
        content.append("jsapi_ticket=").append(getJsapiTicket());
        content.append("&noncestr=").append(noncestr);
        content.append("&timestamp=").append(timestamp);
        content.append("&url=").append(url);
        MessageDigest md = null;  
        String tmpStr = null;  
        try(Formatter formatter = new Formatter()){
            md = MessageDigest.getInstance("SHA-1");  
            // 2.将三个参数字符串拼接成一个字符串进行sha1加密
            md.reset();
            md.update(content.toString().getBytes("UTF-8"));
            for (byte b : md.digest()) {
                formatter.format("%02x", b);
            }
            long tims = JspaiTicket_access - (System.currentTimeMillis()/1000) - 120;
            tmpStr = formatter.toString().concat("@").concat(Long.toString(tims));
        } catch (Exception e) {  
            e.printStackTrace();  
        }
        content = null;
        logger.debug("----------------------分享获取机密串 :【{}】",tmpStr);
        // 3.将sha1加密后的字符串返回
        return tmpStr;  
    }

 获取jsapiTickt 和accessToken  (为保证有效性，可采用redis存储/或者采用Map)

/**
     * 获取 access_token
     * 代码注解见 getJsapiTicket()  本类
     * 两方法类似
     * @return
     */
    public static String getAccessToken(){
        String relust = null;
        long now = AccessToken_access - System.currentTimeMillis();
        if(AccessToken == null || "".equals(AccessToken) || now <= 0){
            try(Jedis jesis = JedisUtil.getJedisConnection(Constant.TICKET_DB)){
                // 先取redis ，有值则直接返回 
                long times = jesis.ttl(WeChatUtil.WECHAT_ACCESSTOKEN_LOCKE);
                if(times > 300){
                    relust = jesis.get(WECHAT_ACCESSTOKEN_KEY);
                    // 设定本地计时比redis 慢60 
                    AccessToken_access = System.currentTimeMillis() + (times - 60) * 1000;
                }else{
                    String lock = jesis.set(WECHAT_ACCESSTOKEN_LOCKE, "1" ,"nx", "ex",30);
                    if("OK".equals(lock)){
                        relust = HttpConnectionUtil.getString(ACCESSTOKEN_API.replace("APPID", WECHAT_APPID).replace("APPSECRET", WECHAT_SECRETKEY));
                        JSONObject json = JSONObject.parseObject(relust);
                        relust = json.getString("access_token");
                        if(relust!=null && !"".equals(relust)){
                            jesis.del(WECHAT_ACCESSTOKEN_KEY);
                            jesis.set(WECHAT_ACCESSTOKEN_KEY, relust ,"nx", "ex",7150);
                            AccessToken = relust;
                            AccessToken_access = System.currentTimeMillis() + ((7200-360) * 1000);
                        }
                    }
                }
            } catch (Exception e) {
                logger.error("--------------------WECHAT_ACCESSTOKEN 获取异常---------------------");
                return null;
            }
        } 
        logger.debug("--------------------WECHAT_ACCESSTOKEN 获取成功：【{}】---------------------",AccessToken);
        return AccessToken;
    }
    
    /**
     * 获取 jsapi_ticket
     * @return
     */
    public static String getJsapiTicket(){
        String relust = null;
        long now = JspaiTicket_access - System.currentTimeMillis();
        // 判断 ticket 时效性 ，判断 ticket 本地是否有 
        if(JspaiTicket == null || "".equals(JspaiTicket) || now <= 0){
            // 本地没有，则去分布式缓存中取
            try(Jedis jesis = JedisUtil.getJedisConnection(Constant.TICKET_DB)){
                // 先取redis ，有值则直接返回 
                long times = jesis.ttl(WeChatUtil.WECHAT_JSAPITICKET_LOCKE);
                if(times > 300){
                    relust = jesis.get(WECHAT_JSAPITICKET_KEY);
                    // 设定本地计时比redis 慢60 
                    JspaiTicket_access = System.currentTimeMillis() + (times - 60) * 1000;
                }else{
                    // jsapi 乐观锁 30秒有效
                    String lock = jesis.set(WECHAT_JSAPITICKET_LOCKE, "1" ,"nx", "ex",30);
                    if("OK".equals(lock)){
                        //得锁的线程，进入刷新 jsapi ticket
                        relust = HttpConnectionUtil.getString(WECHAT_GET_JSAPI_API.replace("ACCESS_TOKEN", getAccessToken()));
                        relust = JSONObject.parseObject(relust).getString("ticket");
                        if(relust!=null && !"".equals(relust)){
                            // 刷新 ticket 后保存到本节点，减少 redis 的访问次数
                            jesis.del(WECHAT_JSAPITICKET_KEY);
                            jesis.set(WECHAT_JSAPITICKET_KEY, relust ,"nx", "ex",7150); 
                            JspaiTicket = relust;
                            JspaiTicket_access = System.currentTimeMillis() + ((7200-360) * 1000);
                        }
                    }else{
                        // 没有拿到锁，30秒之后再来的线程从新初始化
                        JspaiTicket_access = JspaiTicket_access + 30;
                    }
                }
            } catch (Exception e) {
                logger.error("-------------------- WECHAT_JSAPITICKET 获取异常 ---------------------");
                return null;
            }
        }
        logger.debug("--------------------WECHAT_JSAPITICKET 获取成功：【{}】---------------------",JspaiTicket);
        return JspaiTicket;
    }