C#封装百度Web服务API处理包含（Geocoding API，坐标转换API）
1、创建基础参数类
1 public static class BaiduConstParams 2 { 3 public const string PlaceApIv2Search = "http://api.map.baidu.com/place/v2/search"; 4 public const string PlaceApIv2Detail = "http://api.map.baidu.com/place/v2/detail"; 5 public const string PlaceApIv2Eventsearch = "http://api.map.baidu.com/place/v2/eventsearch"; 6 public const string PlaceApIv2Eventdetail = "http://api.map.baidu.com/place/v2/eventdetail"; 7 public const string GeocodingApIv2 = "http://api.map.baidu.com/geocoder/v2/"; 8 public const string GeocodingApIv2Reverse = "http://api.map.baidu.com/geocoder/v2/"; 9 public const string TranslateApi = "http://openapi.baidu.com/public/2.0/bmt/translate"; 10 public const string GeoconvApi = "http://api.map.baidu.com/geoconv/v1/"; 11 } 12 13 public static class BaiduErrorMessages 14 { 15 public const string NotKey = "密钥不存在"; 16 public const string LackParam = "缺少必要请求参数"; 17 }
2、定义API错误信息与产品信息
1 public enum BaiduLbsType 2 { 3 PlaceApIv2Search, 4 PlaceApIv2Detail, 5 PlaceApIv2Eventsearch, 6 PlaceApIv2Eventdetail, 7 GeocodingApIv2, 8 GeocodingApIv2Reverse, 9 Translate, 10 Geoconv 11 } 12 13 public enum Status 14 { 15 /// <summary> 16 /// 正常 17 /// </summary> 18 Ok = 0, 19 /// <summary> 20 /// 请求参数非法 21 /// </summary> 22 ParameterInvalid = 2, 23 /// <summary> 24 /// 权限校验失败 25 /// </summary> 26 VerifyFailure = 3, 27 /// <summary> 28 /// 配额校验失败 29 /// </summary> 30 QuotaFailure = 4, 31 /// <summary> 32 /// 不存在或者非法 33 /// </summary> 34 AkFailure = 5, 35 /// <summary> 36 /// Transform 内部错误 37 /// </summary> 38 InternalError = 1, 39 /// <summary> 40 /// from非法 41 /// </summary> 42 FromIllegal = 21, 43 /// <summary> 44 /// to非法 45 /// </summary> 46 ToIllegal = 22, 47 /// <summary> 48 /// coords非法 49 /// </summary> 50 CoordsIllegal = 24, 51 /// <summary> 52 /// coords个数非法，超过限制 53 /// </summary> 54 CoordsCountIllegal = 25 55 56 }
3、定义API结果返回实体映射类
public class BaiduGeocodingResults { /// <summary> /// 返回结果状态值， 成功返回0，其他值请查看附录。 /// </summary> [JsonProperty(PropertyName = "status")] public Status Status; /// <summary> /// 返回结果状态值， 成功返回0，其他值请查看附录。 /// </summary> [JsonProperty(PropertyName = "result")] public BaiduGeocodingResult Result; } public class BaiduGeocodingResult { /// <summary> /// 经纬度坐标 /// </summary> [JsonProperty(PropertyName = "location")] public BaiduGeocodingLoaction Location; /// <summary> /// 位置的附加信息，是否精确查找。1为精确查找，0为不精确。 /// </summary> [JsonProperty(PropertyName = "precise")] public int Precise; /// <summary> /// 可信度 /// </summary> [JsonProperty(PropertyName = "confidence")] public int Confidence; /// <summary> /// 地址类型 /// </summary> [JsonProperty(PropertyName = "level")] public string Level; /// <summary> /// 结构化地址信息 /// </summary> [JsonProperty(PropertyName = "formatted_address")] public string FormattedAddress; /// <summary> /// 所在商圈信息，如 "人民大学,中关村,苏州街" /// </summary> [JsonProperty(PropertyName = "business")] public string Business; /// <summary> /// 具体地址 /// </summary> [JsonProperty(PropertyName = "addressComponent")] public BaiduGeocodingAddress AddressComponent; } public class BaiduGeocodingLoaction { /// <summary> /// 纬度值 /// </summary> [JsonProperty(PropertyName = "lat")] public decimal Lat; /// <summary> /// 经度值 /// </summary> [JsonProperty(PropertyName = "lng")] public decimal Lng; } public class BaiduGeocodingAddress { /// <summary> /// 城市名 /// </summary> [JsonProperty(PropertyName = "city")] public string City; /// <summary> /// 区县名 /// </summary> [JsonProperty(PropertyName = "district")] public string District; /// <summary> /// 省名 /// </summary> [JsonProperty(PropertyName = "province")] public string Province; /// <summary> /// 街道名 /// </summary> [JsonProperty(PropertyName = "street")] public string Street; /// <summary> /// 街道门牌号 /// </summary> [JsonProperty(PropertyName = "street_number")] public string StreetNumber; }
4、创建API通用处理类
1 public class BaiduLbs 2 { 3 private readonly string _key; 4 5 public static string CurrentRequest = ""; 6 7 public BaiduLbs(string key) 8 { 9 _key = key; 10 } 11 12 /// <summary> 13 /// 请求 14 /// </summary> 15 /// <param name="param"></param> 16 /// <param name="baiduLbsType"></param> 17 /// <param name="encoding"></param> 18 /// <param name="action"></param> 19 public void Request(string param, BaiduLbsType baiduLbsType, Encoding encoding, Action<string> action) 20 { 21 WebClient webClient = new WebClient { Encoding = encoding }; 22 string url = ""; 23 switch (baiduLbsType) 24 { 25 case BaiduLbsType.PlaceApIv2Search: 26 url = string.Format(BaiduConstParams.PlaceApIv2Search + "?{0}", param); 27 break; 28 case BaiduLbsType.PlaceApIv2Detail: 29 url = string.Format(BaiduConstParams.PlaceApIv2Detail + "?{0}", param); 30 break; 31 case BaiduLbsType.PlaceApIv2Eventsearch: 32 url = string.Format(BaiduConstParams.PlaceApIv2Eventsearch + "?{0}", param); 33 break; 34 case BaiduLbsType.PlaceApIv2Eventdetail: 35 url = string.Format(BaiduConstParams.PlaceApIv2Eventdetail + "?{0}", param); 36 break; 37 case BaiduLbsType.GeocodingApIv2: 38 case BaiduLbsType.GeocodingApIv2Reverse: 39 url = string.Format(BaiduConstParams.GeocodingApIv2 + "?{0}", param); 40 break; 41 case BaiduLbsType.Translate: 42 url = string.Format(BaiduConstParams.TranslateApi + "?{0}", param); 43 break; 44 case BaiduLbsType.Geoconv: 45 url = string.Format(BaiduConstParams.GeoconvApi + "?{0}", param); 46 break; 47 48 49 } 50 CurrentRequest = url; 51 action(webClient.DownloadString(url)); 52 } 53 54 /// <summary> 55 /// 响应 56 /// </summary> 57 /// <typeparam name="T"></typeparam> 58 /// <param name="param"></param> 59 /// <param name="baiduLbsType"></param> 60 /// <param name="encoding"></param> 61 public T Response<T>(string param, BaiduLbsType baiduLbsType, Encoding encoding) 62 { 63 T t = default(T); 64 65 Request(param, baiduLbsType, encoding, json => 66 { 67 if (baiduLbsType == BaiduLbsType.GeocodingApIv2 || baiduLbsType == BaiduLbsType.GeocodingApIv2Reverse) 68 { 69 if (json.Contains("\"result\":[]")) 70 { 71 json = json.Replace("\"result\":[]", "\"result\":{}"); 72 } 73 } 74 t = (T)JsonConvert.DeserializeObject(json, typeof(T)); 75 }); 76 return t; 77 } 78 79 public BaiduGeocodingResults BaiduGeocoding(string address, string city) 80 { 81 address = System.Web.HttpUtility.UrlEncode(address); 82 city = System.Web.HttpUtility.UrlEncode(city); 83 string request = string.Format("address={0}&output=json&ak={1}&city={2}", address, _key, city); 84 var result = Response<BaiduGeocodingResults>(request, BaiduLbsType.GeocodingApIv2, Encoding.UTF8); 85 if (result.Status == Status.Ok && result.Result.Location == null) 86 { 87 request = string.Format("address={0}&output=json&ak={1}&city={2}", city + address, _key, city); 88 return Response<BaiduGeocodingResults>(request, BaiduLbsType.GeocodingApIv2, Encoding.UTF8); 89 } 90 return result; 91 } 92 93 public BaiduGeocodingResults BaiduGeocoding(string longitude, string dimensions, string pois) 94 { 95 var location = longitude + "," + dimensions; 96 string request = string.Format("ak={0}&location={1}&pois={2}", _key, location, pois); 97 return Response<BaiduGeocodingResults>(request, BaiduLbsType.GeocodingApIv2, Encoding.UTF8); 98 } 99 100 101 public GeoconvResults BaiduGeoconv(GeoconvParams geoconvParams, ref List<GeoconvPOI> geoconvPois) 102 { 103 geoconvParams.Ak = _key; 104 return Response<GeoconvResults>(geoconvParams.ToString(ref geoconvPois), BaiduLbsType.Geoconv, Encoding.UTF8); 105 } 106 107 public GeoconvResults BaiduGeoconv(GeoconvParams geoconvParams, GeoconvPOI geoconvPoi) 108 { 109 geoconvParams.Ak = _key; 110 List<GeoconvPOI> geoconvPois = new List<GeoconvPOI> 111 { 112 geoconvPoi 113 }; 114 return Response<GeoconvResults>(geoconvParams.ToString(ref geoconvPois), BaiduLbsType.Geoconv, Encoding.UTF8); 115 } 116 }