微信開發——使用微信接口（獲取地理位置）

1. 生成微信簽名（只要訪問微信的接口，都需要生成簽名驗證來進行config）

   a. 獲取AccessToken

   //定義靜態常量存放獲取AccessToken的URL
   public final static String GetPageAccessTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=SECRET";
   
   /**
    * 獲取AccessToken
    **/
   public Map<String, String> getAccessToken(String appid, String appsecret) {
       //使用傳入的appid和appsecret，獲取指定的URL
       String requestUrl = GetPageAccessTokenUrl.replace("APPID", appid).replace("SECRET", appsecret);
       //發送請求，獲取AccessToken
       HttpClient client = null;
       Map<String, String> result = new HashMap<String, String>();
       String accessToken = null;
       try {
           client = new DefaultHttpClient();
           HttpGet httpget = new HttpGet(requestUrl);
           ResponseHandler<String> responseHandler = new BasicResponseHandler();
           String response = client.execute(httpget, responseHandler);
           JSONObject OpenidJSONO = JSONObject.parseObject(response);
           accessToken = String.valueOf(OpenidJSONO.get("access_token"));
           result.put("accessToken", accessToken);
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           client.getConnectionManager().shutdown();
       }
       return result;
   }
   

   b. 獲取JsApiTicket

   //定義靜態常量存放獲取JsApiTicket的URL
   public final static String GetPageJsApiTicketUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi";
   
   /*
    * 獲取JsApiTicket
    **/
   public Map<String, String> getJsapiTicket(String accessToken) {
        String requestUrl = GetPageJsApiTicketUrl.replace("ACCESS_TOKEN", accessToken);
        HttpClient client = null;
        Map<String, String> result = new HashMap<String, String>();
        try {
            client = new DefaultHttpClient();
            HttpGet httpget = new HttpGet(requestUrl);
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String response = client.execute(httpget, responseHandler);
            JSONObject OpenidJSONO = JSONObject.parseObject(response);
            String errcode = String.valueOf(OpenidJSONO.get("errcode"));
            String errmsg = String.valueOf(OpenidJSONO.get("errmsg"));
            String ticket = String.valueOf(OpenidJSONO.get("ticket"));
            String expires_in = String.valueOf(OpenidJSONO.get("expires_in"));
            result.put("errcode", errcode);
            result.put("errmsg", errmsg);
            result.put("ticket", ticket);
            result.put("expires_in", expires_in);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            client.getConnectionManager().shutdown();
        }
        return result;
    }
   

   c. 獲取隨機字符串

   public String getRandomStr(int length) {
       String base = "abcdefghijklmnopqrstuvwxyz0123456789";
       int randomNum;
   	char randomChar;
       Random random = new Random();
       // StringBuffer類型的可以append增加字符
       StringBuffer str = new StringBuffer();
    
       for (int i = 0; i < length; i++) {
           // 可生成[0,n)之間的整數，獲得隨機位置
           randomNum = random.nextInt(base.length());
           // 獲得隨機位置對應的字符
           randomChar = base.charAt(randomNum);
           // 組成一個隨機字符串
           str.append(randomChar);
       }
       return str.toString();
   }
   

   d. 獲取時間戳

   String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
   

   e. 按順序拼接字符串

   String str = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + noncestr + "&timestamp=" + timestamp + "&url=" + url;//將參數排序並拼接字符串
   

   f. 使用SH1加密字符串

   /**
    * SH1加密
    */
   private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};  
   
   /** 
   * Takes the raw bytes from the digest and formats them correct. 
   * 
   * @param bytes the raw bytes from the digest. 
   * @return the formatted bytes. 
   */  
   private static String getFormattedText(byte[] bytes) {  
   	int len = bytes.length;  
   	StringBuilder buf = new StringBuilder(len * 2);  
   	// 把密文轉換成十六進制的字符串形式  
   	for (int j = 0; j < len; j++) {  
   		buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);  
   		buf.append(HEX_DIGITS[bytes[j] & 0x0f]);  
   	}  
   	return buf.toString();  
   }  
   
   public String encode(String str) {  
   	if (str == null) {  
   		return null;  
   	}  
   	try {  
   		MessageDigest messageDigest = MessageDigest.getInstance("SHA1");  
   		messageDigest.update(str.getBytes());  
   		return getFormattedText(messageDigest.digest());  
   	} catch (Exception e) {  
   		throw new RuntimeException(e);  
   	}  
   }
   

   j. 返回數據

   JSONObject jsonObject = new JSONObject();
   jsonObject.put("appId", "APPID");
   jsonObject.put("timestamp",timestamp);
   jsonObject.put("accessToken",accessToken);
   jsonObject.put("ticket",jsapiTicket);
   jsonObject.put("nonceStr",noncestr);
   jsonObject.put("signature",signature);
   return ResultUtil.successResult(jsonObject);
   

2. 使用生成的簽名訪問微信API之前需要先進行wx.config校驗
   （企業微信簽名正確但是驗證不通過，說明沒有進行安全域名驗證，需要進入企業微信找到對應的應用進行安全域名驗證）

   wx.config({
   	debug: true, // 開啟調試模式,調用的所有api的返回值會在客戶端alert出來
   	appId: data.content.appId,// 必填，公眾號的唯一標識
   	timestamp: data.content.timestamp,// 必填，生成簽名的時間戳
   	nonceStr: data.content.nonceStr, // 必填，生成簽名的隨機串
   	signature: data.content.signature,// 必填，簽名，見附錄1
   	jsApiList: ['getLocation'] // 必填，需要使用的JS接口列表，所有JS接口列表見附錄2
   });
   
   wx.error(function (res) {
   	console.log(res);
   });
   
   wx.ready(function() {
   	// config信息驗證后會執行ready方法，所有接口調用都必須在config接口獲得結果之后，config是一個客戶端的異步操作，所以如果需要在頁面加載時就調用相關接口，則須把相關接口放在ready函數中調用來確保正確執行。對於用戶觸發時才調用的接口，則可以直接調用，不需要放在ready函數中。
   	console.log("wx.ready");
   	wxlocate();
   });
   

3. 訪問微信接口（獲取地理位置接口）

   wx.getLocation({
   	debug: false,
   	type: 'wgs84', // 默認為wgs84的gps坐標，如果要返回直接給openLocation用的火星坐標，可傳入'gcj02'
   	success(res) {
   		console.log("wx.getLocation");
   		var latitude = res.latitude; // 緯度，浮點數，范圍為90 ~ -90
   		var longitude = res.longitude; // 經度，浮點數，范圍為180 ~ -180。
   		var gpsPoint = new BMap.Point(longitude, latitude);
   		BMap.Convertor.translate(gpsPoint, 0, initMap); //轉換坐標
   
   	},
   	fail(err){
   		console.log(err);
   	}
   });