最新整理出的微信分享后端接口实现的大致流程

来源：php是最好的语言发布时间：2018-08-13 10:01:32 阅读量：801

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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