微信分享后台接口简单实现

此接口大致的流程是：用户创建时间戳，随机字符串，当前需要分享的页面的url三个变量，接着将自己的appid和APPsecret作为请求参数获取access_token，再根据access_token获取jsapi_ticket, 并将获取的jsapi-ticket进行加密、校验以及自己创建的三个变量进行签名，注意签名过程案按照 key 值 ASCII 码升序排序封装成json格式的数据传送到前台JS页面，具体程序如下；

public class WeiXinShareAction extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private Integer main_count = 888;
    private String flag = "1";
    private Log logger = LogFactory.getLog(this.getClass());

    private String filePath = "/B.txt";

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        JsonObject jsonObject = new JsonObject();

        String ticket = null;
        String[] wxInfo = new String[] { "wx007344f87ae48300", "5442edc712b6846bdd1c058b7f2318fe" };
        WeiXinUtil wxu = new WeiXinUtil();
        String ticketResString;

        try {

            ticketResString = wxu.getShareJsapiTicket(wxInfo);
            if (StringUtils.isNotEmpty(ticketResString)) {
                JSONObject ticketJSONObject = JSONObject.fromObject(ticketResString);
                if (ticketJSONObject.getInt("errcode") == 0) {
                    ticket = JSONObject.fromObject(ticketResString).getString("ticket");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (StringUtils.isEmpty(ticket)) {
            jsonObject.addProperty("errcode", 10002);
            jsonObject.addProperty("errmsg", "ticket_error");
            this.responseWrite(jsonObject.toString(), response);
            return;
        }
        String noncestr = this.createNonceStr();
        int timestamp = this.createTimestamp();
        String requestRefererURL = request.getHeader("referer");
        flag = request.getParameter("temp");
        logger.info("flag--------------" + flag);
        //这里是保存点击次数
        //没有数据库的情况下 保证服务重启后点击次数不清零
        //利用线程锁 使用IO流 对点击次数进行修改保存
             Thread_readFile thf4 = new Thread_readFile();
             thf4.start();

        logger.warn("requestRefererURL: " + requestRefererURL);

        String signature = this.createSignature(noncestr, ticket, timestamp, requestRefererURL);

        jsonObject.addProperty("countNum", main_count);//点击次数
        jsonObject.addProperty("errcode", 0);//
        jsonObject.addProperty("errmsg", "");//
        jsonObject.addProperty("wxuser", wxInfo[0]); // appId
        jsonObject.addProperty("timestamp", timestamp);//时间戳
        jsonObject.addProperty("noncestr", noncestr);//随机字符串
        jsonObject.addProperty("signature", signature);//签名
        response.setHeader("Access-Control-Allow-Origin", "*");
        this.responseWrite(jsonObject.toString(), response);
    }
    private void responseWrite(String content, HttpServletResponse response) {
        try {
            response.setCharacterEncoding("utf-8");
            response.getWriter().write(content);
        } catch (Exception e) {
            logger.error("responseWrite error in WeiXinShareAction", e);
        }
    }
}