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);         }     } }

获取access_token;这里开发过程中要注意微信为了减轻对服务器的访问压力限制了access_token每天的生成次数以及使用时长；由于限制时长为7200s 于是做了一个判断再生成一个token后的2小时用同一个token ；这里仅仅只是一个小接口于是选择将最近一次的生成时间以及 token 存为静态变量，

    /**      * 微信分享，获取access_token      */     private String getWeiXinAccessToken(String[] wxInfo) throws Exception {          //得到当前时间         long current_time = System.currentTimeMillis();         // 每次调用，判断expires_in是否过期，如果token时间超时，重新获取，expires_in有效期为7200         if ((current_time - last_time) / 1000 >= 7200) {              logger.info("第一次访问"+current_time);             logger.info("(current_time - last_time) / 1000===="+(current_time - last_time) / 1000);              String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + wxInfo[0]                     + "&secret=" + wxInfo[1];              String result = this.httpReqExecute(url);             this.logger.warn("from weixin api accessToken: " + result);             try {                 last_time = current_time;                  if (StringUtils.isNotEmpty(result)) { //                   解析respContent，并获取其中的更新的key,                     accessToken = JSONObject.fromObject(result).getString("access_token"); //                  保存access_token                     return accessToken;                 }             } catch (Exception e) {                 logger.error("getAccessToken error in WeiXinShareAction", e);             }         }else{             logger.info("第二次访问"+last_time);             logger.info("(current_time - last_time) / 1000===="+(current_time - last_time) / 1000);             logger.info("from weixin api accessToken:"+accessToken);             return accessToken;         }         return null;     }

根据access_token获取jsapiTicket

    /**      * 微信分享，获取jsapiTicket      */     public String getShareJsapiTicket(String[] wxInfo) throws Exception {          String access_Token = this.getWeiXinAccessToken(wxInfo);          if (StringUtils.isEmpty(access_Token)) { // 获取 accessToken 失败             //this.logger.warn(siteId + " accessToken is empty.");             JsonObject jsonObject = new JsonObject();             jsonObject.addProperty("errcode", "10000");             jsonObject.addProperty("errmsg", "access_error");             return jsonObject.toString();         }          String url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + access_Token + "&type=jsapi";         String jsapiTicket = this.httpReqExecute(url);         this.logger.warn(" from weixin api jsapiTicket is: " + jsapiTicket);          if (StringUtils.isNotEmpty(jsapiTicket)) {             return jsapiTicket;         }         return null;     }

Http远程调用

    private String httpReqExecute(String url) {         String result = "";         DefaultHttpClient httpclient = null;         try {             httpclient = new DefaultHttpClient();             HttpPost httppost = new HttpPost(url);             // 执行             HttpResponse response = httpclient.execute(httppost);             HttpEntity entity = response.getEntity();             if (entity != null && response.getStatusLine().getStatusCode() == 200) {                 result = EntityUtils.toString(entity, "UTF-8");             }         } catch (Exception e) {             logger.error(" WeiXinShareAction 调用微信 API 失败！", e);         } finally {// 关闭连接，释放资源             httpclient.getConnectionManager().shutdown();         }         return result;     }

返回成功

 from weixin api accessToken: {"access_token":"12_9UgVn7tFVtvf_7r4Lq4V9W9-pQdZpqWxVjFsPoF3hv3J5_XfwQWqauj4n9-ZMikC1_oCp0IpBxjpZr-Ty8XzG8QMeV2QVukFz5_NP7kjAB05MX9msxRg0FlpAAMjonrrh5wxSEFfKHEc0_BDHFKjAFAXVA","expires_in":7200}   from weixin api jsapiTicket is: {"errcode":0,"errmsg":"ok","ticket":"HoagFKDcsGMVCIY2vOjf9j_Us44Qhuo4KdgH5u8ewMjOCTUO44m1hKqgEsJYIyFR9HWrmmz-wrsb9KLdmpATRw","expires_in":7200}

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