微信JS-SDK 微信分享接口开发（实用版）

上篇文章  微信JS-SDK 微信分享接口开发（介绍版）    初步介绍了微信分享的流程以及通过前端js快速的模拟出实际效果，但很遗憾以上介绍并不适用于实战，因此本文将重点介绍用Java开发的微信分享功能，并用于实战。

本次功能开发将介绍版中的js代码转为实际的java代码，分为两部分：

1.后台通过java代码请求微信接口获取access-token参数，以此access-token参数再次请求微信接口获取jsapi-ticket，并将获取的jsapi-ticket进行加密、校验与其他的参数封装成json格式的数据传送到前台JS页面

2.前台获取json数据后，并提供给参数给微信分享接口调用，具体接口为js.confige，js.ready;

   获取微信分享页面的标题和描述，以及分享地址、缩略图地址

首先看看前台代码：

jq.wxShare.js 主要供微信分享接口调用：

// 微信分享默认调用接口 var $wx_account = wxdata.wx_account, $wx_share = wxdata.wx_share;//配置微信信息wx.config ({    debug : false,    appId : $wx_account[0],    timestamp : $wx_account[1],    nonceStr : $wx_account[2],    signature : $wx_account[3],    jsApiList : [        // 所有要调用的 API 都要加到这个列表中        'onMenuShareTimeline',        'onMenuShareAppMessage',        'onMenuShareQQ',        'onMenuShareWeibo'    ]});wx.ready (function () {    // 微信分享的数据    var shareData = {        "imgUrl" : $wx_share[0],        "link" : $wx_share[1],        "desc" : $wx_share[2],        "title" : $wx_share[3],        success : function () {  // 分享成功可以做相应的数据处理        }    };    wx.onMenuShareTimeline (shareData);    wx.onMenuShareAppMessage (shareData);    wx.onMenuShareQQ (shareData);    wx.onMenuShareWeibo (shareData);});

jq.wxShare_data.js 提供微信分享接口所用的参数数据

// 提供微信分享接口所需的参数var wxdata = {wx_account : new Array(4),wx_share : new Array(4),get_wxshare_data : function(ctx){var url = ctx + "/weixinShareAction.do?method=getWxShareData";$.ajax({type : "GET",url : url,dataType : "json",cache : false,async : false,success : function(msg) { if(msg.errcode == 0){wxdata.wx_account[0] = msg.wxuser;  // appidwxdata.wx_account[1] = msg.timestamp;   // timestampwxdata.wx_account[2] = msg.noncestr; // noncestrwxdata.wx_account[3] = msg.signature;  // signaturewxdata.wx_share[0] = msg.shareimg;  // share_img 分享缩略图图片wxdata.wx_share[1] = msg.shareurl;// share_link  分享页面的url地址，如果地址无效，则分享失败var description = $("meta[name='description']").attr("content");if ($.trim(description) != "") {wxdata.wx_share[2] = $.trim(description); // share_desc}var title1 = document.title;if ($.trim(title1) != "") {wxdata.wx_share[3] = title1;// share_title}}},error : function(msg){}});}}var host = "http://" + window.location.host;wxdata.get_wxshare_data(host);

后台代码 WeiXinShareAction.java

// 微信分享入口public void getWxShareData() throws Exception {JsonObject jsonObject = new JsonObject();String ticket = null;String[] wxInfo = new String[]{"appId","appsecret"};String ticketResString = this.getShareJsapiTicket(wxInfo);if (StringUtils.isNotEmpty(ticketResString)) {JSONObject ticketJSONObject = JSONObject.fromObject(ticketResString);if (ticketJSONObject.getInt("errcode") == 0) {ticket = JSONObject.fromObject(ticketResString).optString("ticket", "");}}if (StringUtils.isEmpty(ticket)) {jsonObject.addProperty("errcode", 10002);jsonObject.addProperty("errmsg", "ticket_error");this.responseWrite(jsonObject.toString());return;}String noncestr = this.createNonceStr();int timestamp = this.createTimestamp();String requestRefererURL = this.getRequest().getHeader("referer");logger.warn("requestRefererURL: " + requestRefererURL);String signature = this.createSignature(noncestr, ticket, timestamp, requestRefererURL);jsonObject.addProperty("errcode", 0);jsonObject.addProperty("errmsg", "");jsonObject.addProperty("wxuser", wxInfo[0]); // appIdjsonObject.addProperty("timestamp", timestamp);jsonObject.addProperty("noncestr", noncestr);jsonObject.addProperty("signature", signature);jsonObject.addProperty("shareimg", "http://www.abc.com/123.jpg");jsonObject.addProperty("shareurl", "http://www.abc.com/123.html");this.responseWrite(jsonObject.toString());}

/** * 微信分享，获取JsapiTicket */private String getShareJsapiTicket(String[] wxInfo) throws Exception {String siteId = "mywebSite";String jsapiTicket = remoteMemcachedClient.get(siteId + "_jsapiTicket");if (StringUtils.isNotEmpty(jsapiTicket)) {this.logger.warn(siteId + " from memcached jsapiTicket: " + jsapiTicket);return jsapiTicket;}String accessToken = this.getWeiXinAccessToken(wxInfo);if (StringUtils.isEmpty(accessToken)) { // 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="+ accessToken + "&type=jsapi";jsapiTicket = this.httpReqExecute(url);this.logger.warn(siteId + " from weixin api jsapiTicket is: " + jsapiTicket);if(StringUtils.isNotEmpty(jsapiTicket)) {// 向memcached里写内容，第二个参数为过期时间，单位为：秒remoteMemcachedClient.set(siteId + "_jsapiTicket", 1 * 60 * 90, jsapiTicket);return jsapiTicket;}return null;}

/** * 微信分享，获取access_token */private String getWeiXinAccessToken(String[] wxInfo) throws Exception {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 {if(StringUtils.isNotEmpty(result)) {// 解析respContent，并获取其中的更新的key,String accessToken = JSONObject.fromObject(result).optString("access_token", "");return accessToken;}} catch (Exception e) {logger.error("getAccessToken error in WeiXinShareAction", e);}return null;}

组装数据方法

// 数据签名 private String createSignature(String nocestr, String ticket, int timestamp, String url) {// 这里参数的顺序要按照 key 值 ASCII 码升序排序String s = "jsapi_ticket=" + ticket + "&noncestr=" + nocestr + "×tamp=" + timestamp + "&url=" + url;return DigestUtils.shaHex(s);}// 创建随机串 自定义个数0 < ? < 32 private String createNonceStr() {String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";String nonceStr = "";        for (int i = 0; i < 16; i++) {        int beginIndex = (int) Math.round(Math.random() * 10);            nonceStr += str.substring(beginIndex, beginIndex + 1);        }        return nonceStr;    }// 创建时间戳private int createTimestamp() {        return Calendar.getInstance().get(Calendar.SECOND);    }

http请求接口

// 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  org.apache.http.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;}

输出帮助信息

// 输出信息private void responseWrite(String content) {try {getResponse().setCharacterEncoding("utf-8");getResponse().getWriter().write(content);} catch (Exception e) {logger.error("responseWrite error in WeiXinShareAction", e);}}

详细代码见 实用版代码下载

注意：由于所有的js代码最后压缩为core.min.js文件，因此必须在分享页面中添加js文件 <script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>，且该core.min.js文件必须在分享页面中加载，否则分享失败，

参见微信JS-SDK微信分享接口开发介绍版