微信开发——使用微信接口（获取地理位置）

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);

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();
});

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);
	}
});