微信JSAPI Ticket接口签名详解

/**
 * 获取access_token，然后jsapi_ticket
 */
 private String getAccessToken_ticket(String path) {
 String access_token = null; // access_token
 String atime = null;// 获取时间
 String a_expires_in = null;// 有效时间(s)
 String ticket = null;// jsapi_ticket
 String ttime = null;// 得到时间
 String t_expires_in = null;// 有效时间(s)
 String access_tokenStr = TUtils.getAccessToken(APPID,
  API_KEY);
 if (access_tokenStr != null
  && access_tokenStr.indexOf("access_token") != -1) {
  try {
  JSONObject jsonObject = new JSONObject(access_tokenStr);
  access_token = jsonObject.getString("access_token");
  a_expires_in = jsonObject.getString("expires_in");
  atime = getCurrentDateStr();
  } catch (JSONException e) {
  // e.printStackTrace();
  }
 }
 if (access_token != null && !access_token.equals("")) {
  String ticketStr = TicketUtils.getJSAPITicket(access_token);
  // System.out.println("ticketStr:" + ticketStr);
  if (ticketStr != null && ticketStr.indexOf("ticket") != -1) {
  try {
   JSONObject jsonObject = new JSONObject(ticketStr);
   ticket = jsonObject.getString("ticket");
   t_expires_in = jsonObject.getString("expires_in");
   ttime = getCurrentDateStr();
  } catch (JSONException e) {
   // e.printStackTrace();
  }
  }
 }
 String result = null;
 if (ticket != null && !ticket.equals("")) {
  result = "{\"access_token\":\"" + access_token
   + "\",\"a_expires_in\":\"" + a_expires_in
   + "\",\"atime\":\"" + atime + "\",\"ticket\":\"" + ticket
   + "\",\"t_expires_in\":\"" + t_expires_in
   + "\",\"ttime\":\"" + ttime + "\"}";
  if (MyFileUtils.writeIntoText(path, result)) {
  // System.out.println("写入文件成功");
  // System.out.println(result);
  } else {
  System.out.println("写入微信签名文件失败");
  }
 }
 return result;
 }

public static String getAccessToken(String APPID, String APPSECRET) {

String url = "https://api.weixin.qq.com/cgi-bin/token";
 String params = "grant_type=client_credential&appid=" + APPID
  + "&secret=" + APPSECRET;
String resultStr = HttpRequest.sendGet(url, params);
// sendGet：用get方法获取数据 ,具体请参考之间的关于微信的文章 http://www.cnblogs.com/jiduoduo/p/5749363.html

return resultStr;

}


/**
 * 根据access_token获取ticket { "errcode":0, "errmsg":"ok", "ticket":
 * "bxLdikRXVbTPdHSM05e5u5sUoXNKd8-41ZO3MhKoyN5OfkWITDGgnr2fwJ0m9E8NYzWKVZvdVtaUgWvsdshFKA"
 * , "expires_in":7200 }
 * 
 * @param access_token
 * @return
 */
 public static String getJSAPITicket(String access_token) {
 String url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket";
 String params = "type=jsapi&access_token=" + access_token;
 String resultStr = HttpRequest.sendGet(url, params);

 return resultStr;
 }

public String Wx_Signature() {
 String path = ServletActionContext.getServletContext().getRealPath(
  "/wx/");
 // System.out.println(path);
 try {
  String tokenJSON = MyFileUtils.readText(path);
  // String access_token = null; // access_token
  String atime = null;// 获取时间
  String a_expires_in = null;// 有效时间(s)
  String ticket = null;// jsapi_ticket
  // String ttime = null;// 得到时间
  // String t_expires_in = null;// 有效时间(s)
  String result = tokenJSON;
  if (result == null || result.equals("")) {
  tokenJSON = getAccessToken_ticket(path);
  }
  // System.out.println(result);
  if (tokenJSON != null && !tokenJSON.equals("")
   && tokenJSON.indexOf("access_token") != -1) {
  try {
   JSONObject jsonObject = new JSONObject(tokenJSON);
   // access_token = jsonObject.getString("access_token");//
   // access_token
   atime = jsonObject.getString("atime");// 开始时间
   a_expires_in = jsonObject.getString("a_expires_in");// 有效时间
   ticket = jsonObject.getString("ticket");// jsapi_ticket
   // System.out.println(ticket);
   // ttime = jsonObject.getString("ttime");// 开始时间
   // t_expires_in = jsonObject.getString("t_expires_in");//
   // 有效时间
   String t1 = getCurrentDateStr();
   String t2 = atime;
   // System.out.println(atime);
   // System.out.println(a_expires_in);
   // System.out.println(TimeInterval.getInterval(t2, t1));
   long end_time = Long.parseLong(a_expires_in) - 60;
   if (TimeInterval.getInterval(t2, t1) > end_time) {
   ticket = getAccessToken_ticket(path);
   }
  } catch (JSONException e) {
   msg = e.getMessage();
  }
  } else {

  }
  // System.out.println(ticket);
  String url = getParameter("url");
  String noncestr = TUtils.getRandomString(16);
  String timestamp = System.currentTimeMillis() + "";
  timestamp = timestamp.substring(0, 10);
  String data = "jsapi_ticket=" + ticket + "&noncestr=" + noncestr
   + "&timestamp=" + timestamp + "&url=" + url;
  String digest = new SHA1().getDigestOfString(data.getBytes());
  String signature = digest.toLowerCase();// signature
  result = "{\"noncestr\":\"" + noncestr + "\",\"timestamp\":\""
   + timestamp + "\",\"url\":\"" + url + "\",\"signature\":\""
   + signature + "\" ,\"ticket\":\"" + ticket + "\"}";
　　　　　　　　msg = result;
 } catch (IOException e) {
  msg = e.getMessage();
 }
 return msg 
 }