百度地圖定位Demo

//獲取定位城市
    @RequestMapping(value = "/cityName.html", method = { RequestMethod.POST })
    public @ResponseBody HttpJsonResult<String> getLoginUser(HttpServletRequest request,
            HttpServletResponse response) {

        //獲取定位城市
        String longitude = request.getParameter("longitude");
        String latitude = request.getParameter("latitude");
        String jwd = latitude+","+longitude;
        List<NameValuePair> paramList = new ArrayList<NameValuePair>();
        paramList.add(new BasicNameValuePair("ak", "你的百度AK"));//傳遞的參數
        paramList.add(new BasicNameValuePair("sn", ""));//傳遞的參數
        paramList.add(new BasicNameValuePair("output", "json"));//傳遞的參數
        paramList.add(new BasicNameValuePair("pois", "1"));//傳遞的參數
        paramList.add(new BasicNameValuePair("location", jwd));//傳遞的參數
        String urlString = "http://api.map.baidu.com/geocoder/v2/";
        String entity = HttpClientUtil.post(urlString, paramList);
        Map<String,Object> resultMap = JsonUtil.fromJson(entity);
        Map<String,Object> m = (Map) resultMap.get("result");
        Map<String,String> add = (Map<String, String>) m.get("addressComponent");
        String city = add.get("city");
        city = city.replace("市","");
        HttpJsonResult<String> jsonResult = new HttpJsonResult<String>();
        jsonResult.setData(city);
        return jsonResult;
    }

json工具

   /**
     * 將JSON字符串反序列化爲Java對象。
     * @param json JSON字符串
     * @return
     * <li>json字符串爲空時返回null；
     * <li>json字符串爲無效JSON格式時，會記錄日誌，返回null；
     */
    public static final <T> T fromJson(String json) {
        if (StringUtil.isEmpty(json))
            return null;

        try {
            Type type = new TypeToken<T>() {
            }.getType();
            Gson gson = new Gson();
            return gson.fromJson(json, type);
        } catch (Exception e) {
            log.warn("Invalidate json format:" + json, e);
            return null;
        }
    }

Http請求工具類

public static String post(String url, List<? extends NameValuePair> parameters) {
		return post(url, parameters, DEFAULT_CHARSET);
	}

	public static String post(String url, String parameters) {
		return post(url, parameters, DEFAULT_CHARSET);
	}

	public static String post(String url, List<? extends NameValuePair> parameters, String charset) {
		HttpPost httpPost = new HttpPost(url);
		httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded");
		if (parameters != null && parameters.size() > 0) {
			UrlEncodedFormEntity entity;
			try {
				entity = new UrlEncodedFormEntity(parameters, charset);
				httpPost.setEntity(entity);
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}
		return sendHttpRequest(httpPost, charset);
	}

前端js

 //定位
    var longitude =  '';
    var latitude = '';
    var options={
        enableHighAccuracy:true, //boolean 是否要求高精度的地理信息
        timeout:0,//表示等待響應的最大時間，默認是0毫秒，表示無窮時間
        maximumAge:1000//應用程序的緩存時間
    }
    var geolocation = new BMap.Geolocation();
    geolocation.getCurrentPosition(onSuccess,onError,options );
    function onSuccess(r){
        if(this.getStatus() == BMAP_STATUS_SUCCESS){
            //創建地圖實例
            var map =new BMap.Map("container");
            // 經度+經度校正值： 0.01863369751900734
            //   緯度+緯度校正值： -0.004080683120882611;
            longitude =  r.point.lng+0.01863369751900734;
            latitude =  r.point.lat-0.004080683120882611;

            $.ajax({
                type: "POST",
                url: "${(domainUrlUtil.EJS_URL_RESOURCES)!}/h5/cityName.html",
                data: {longitude:longitude,latitude:latitude},
                success: function (data) {
                    //加載數據
                    var cityName1 =  $("#cityName1").val();

                    //切換城市
                    if(cityName1 != ""){
                        $("#cityName").html(cityName1);
                        localStorage.setItem("cityName",cityName1);
                    }else {//第一次定位
                        if(localStorage.getItem("cityName") == null || localStorage.getItem("cityName") == ""){
                            $("#cityName").html(data.data);
                            localStorage.setItem("cityName",data.data);
                        }else {//已經定位過
                            $("#cityName").html(localStorage.getItem("cityName"));
                        }
                    }
               
                }
            });
        } else {
        }
    };

使用百度API的正逆地理編碼。做爲參考