由於微信小程式沒有方法可以獲得當前使用者所在城市的資訊，所以需要呼叫方法來獲取城市資訊，用了兩個方法去傳送請求並返回城市資訊
1.

@Controller
public class WechatLocationManager {

    private Logger logger = LoggerFactory.getLogger(WechatLocationManager.class);

    @RequestMapping(value = "/wechat/getcity", method = RequestMethod.POST)
    @ResponseBody
    public
 
 String getCity( @RequestBody Map<String, String> location) {
        String local = location.get("location");
        System.out.println(local);
        String latitude = local.substring(0, local.indexOf(','));
        String longitude = local.substring(local.indexOf(',') + 1);
        logger.debug("緯度：{}"
 
, latitude);
        logger.debug("經度：{}", longitude);
        String url = "http://api.map.baidu.com/geocoder/v2/?ak=2IBKO6GVxbYZvaR2mf0GWgZE&output=json&pois=0" +
            "&location=" + latitude + "," + longitude;
        HttpURLConnection connection = null;
        BufferedReader reader = null
 
;
        try {
            URL getUrl = new URL(url);
            connection = (HttpURLConnection) getUrl.openConnection();
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            connection.connect();
            reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"));
            StringBuilder builder = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                builder.append(line);
            }
            if (logger.isDebugEnabled())
                logger.debug(builder.toString());
            return JSONObject.fromObject(builder.toString());
        } catch (Exception e) {
            e.printStackTrace();
            logger.error(e.getMessage());
        } finally {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                connection.disconnect();
            }
        }
        return obj;
    }
}

2.第二個方法是根據專案中提供的傳送請求的方法去傳送並接受返回的資訊

private static final String LOCATION_URL = "http://api.map.baidu.com/geocoder/v2/";
    private static final Map<String, String> LOCATION_INPUT = new ConcurrentHashMap<String,String>(){
        {
            put("ak", "2IBKO6GVxbYZvaR2mf0GWgZE");
            put("output", "json");
            put("pois","0");
        }
    };

    @RequestMapping(value = "/wechat/city", method = RequestMethod.POST)
    @ResponseBody
    public String getCity(@RequestBody Map<String, String> location) {
        String local = location.get("location");
        System.out.println(local);
        String latitude = local.substring(0, local.indexOf(','));
        String longitude = local.substring(local.indexOf(',') + 1);
        logger.debug("緯度：{}", latitude);
        logger.debug("經度：{}", longitude);
        LOCATION_INPUT.put("location", local);
        String obj = HttpClientUtils.doGetWithHeader(null, LOCATION_URL, LOCATION_INPUT, null, "utf-8", null);
        return obj;
    }

這裡記錄一下doGet方法去處理請求的

public static String doGet(CloseableHttpClient client, String url, Map<String, String> params, String charset, String userAgent, Map<String, String> heads) {
        if (StringUtils.isBlank(url)) {
            return null;
        }
        CloseableHttpResponse response = null;
        try {
            if (params != null && !params.isEmpty()) {
                List<NameValuePair> pairs = new ArrayList<>(params.size());
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    String value = entry.getValue();
                    if (value != null) {
                        pairs.add(new BasicNameValuePair(entry.getKey(), value));
                    }
                }
                url += "?" + EntityUtils.toString(new UrlEncodedFormEntity(pairs, charset));
            }
            HttpGet httpGet = new HttpGet(url);
            if (StringUtils.isNotBlank(userAgent)) {
                httpGet.addHeader(HTTP.USER_AGENT, userAgent);
            }
            if (heads != null && !heads.isEmpty()) {
                for (Map.Entry<String, String> entry : heads.entrySet()) {
                    String value = entry.getValue();
                    if (value != null) {
                        httpGet.addHeader(entry.getKey(),value);
                    }
                }
            }
            response = client.execute(httpGet);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != 200) {
                httpGet.abort();
                throw new RuntimeException("HttpClient,error status code :" + statusCode);
            }
            HttpEntity entity = response.getEntity();
            String result = null;
            if (entity != null) {
                result = EntityUtils.toString(entity, charset);
            }
            EntityUtils.consume(entity);
            response.close();
            return result;
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (null != response) {
                try {
                    response.close();
                } catch (Exception ex) {
                    logger.error("close response has error.");
                }
            }
        }
    }