微信开发——使用微信接口（获取地理位置）

1. 生成微信签名（只要访问微信的接口，都需要生成签名验证来进行config）

   a. 获取AccessToken

   //定义静态常量存放获取AccessToken的URL
   public final static String GetPageAccessTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=SECRET";
   
   /**
    * 获取AccessToken
    **/
   public Map<String, String> getAccessToken(String appid, String appsecret) {
       //使用传入的appid和appsecret，获取指定的URL
       String requestUrl = GetPageAccessTokenUrl.replace("APPID", appid).replace("SECRET", appsecret);
       //发送请求，获取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. 获取JsApiTicket

   //定义静态常量存放获取JsApiTicket的URL
   public final static String GetPageJsApiTicketUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi";
   
   /*
    * 获取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. 获取随机字符串

   public String getRandomStr(int length) {
       String base = "abcdefghijklmnopqrstuvwxyz0123456789";
       int randomNum;
   	char randomChar;
       Random random = new Random();
       // StringBuffer类型的可以append增加字符
       StringBuffer str = new StringBuffer();
    
       for (int i = 0; i < length; i++) {
           // 可生成[0,n)之间的整数，获得随机位置
           randomNum = random.nextInt(base.length());
           // 获得随机位置对应的字符
           randomChar = base.charAt(randomNum);
           // 组成一个随机字符串
           str.append(randomChar);
       }
       return str.toString();
   }
   

   d. 获取时间戳

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

   e. 按顺序拼接字符串

   String str = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + noncestr + "&timestamp=" + timestamp + "&url=" + url;//将参数排序并拼接字符串
   

   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);  
   	// 把密文转换成十六进制的字符串形式  
   	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. 返回数据

   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. 使用生成的签名访问微信API之前需要先进行wx.config校验
   （企业微信签名正确但是验证不通过，说明没有进行安全域名验证，需要进入企业微信找到对应的应用进行安全域名验证）

   wx.config({
   	debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来
   	appId: data.content.appId,// 必填，公众号的唯一标识
   	timestamp: data.content.timestamp,// 必填，生成签名的时间戳
   	nonceStr: data.content.nonceStr, // 必填，生成签名的随机串
   	signature: data.content.signature,// 必填，签名，见附录1
   	jsApiList: ['getLocation'] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2
   });
   
   wx.error(function (res) {
   	console.log(res);
   });
   
   wx.ready(function() {
   	// config信息验证后会执行ready方法，所有接口调用都必须在config接口获得结果之后，config是一个客户端的异步操作，所以如果需要在页面加载时就调用相关接口，则须把相关接口放在ready函数中调用来确保正确执行。对于用户触发时才调用的接口，则可以直接调用，不需要放在ready函数中。
   	console.log("wx.ready");
   	wxlocate();
   });
   

3. 访问微信接口（获取地理位置接口）

   wx.getLocation({
   	debug: false,
   	type: 'wgs84', // 默认为wgs84的gps坐标，如果要返回直接给openLocation用的火星坐标，可传入'gcj02'
   	success(res) {
   		console.log("wx.getLocation");
   		var latitude = res.latitude; // 纬度，浮点数，范围为90 ~ -90
   		var longitude = res.longitude; // 经度，浮点数，范围为180 ~ -180。
   		var gpsPoint = new BMap.Point(longitude, latitude);
   		BMap.Convertor.translate(gpsPoint, 0, initMap); //转换坐标
   
   	},
   	fail(err){
   		console.log(err);
   	}
   });