最新整理出的微信分享后端接口实现的大致流程
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2022-04-04 10:23:24
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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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