在做一个电商项目过程中，需要获取设备地理信息，包括经纬度定位，附近地址等，于是写了一个工具类方便使用。
1.在使用百度地图API使，首先要获取官方授权，在/index.php?title=androidsdk页面获取秘钥，然后按照要求申请即可，需要手机和百度账号及邮箱认证。激活后可看到后台页面，现在可以开始创建应用了，这里请求校验方式有两种，一种是白名单IP，另一种是SN校验（旁边有计算的说明），我选择SN校验：
计算sn：
*** Description:获取百度地理编码的sn的工具类**/public class BaiDuGeocodingSnCalUtil {private static final String HEADER = "/geocoder/v2/?";public static String getSnCalString(String paramsStr) {String tempStr = null;try {// 对paramsStr前面拼接上/geocoder/v2/?，后面直接拼接yoursk得到/geocoder/v2/?address=%E7%99%BE%E5%BA%A6%E5%A4%A7%E5%8E%A6&output=json&ak=yourakyourskString wholeStr = HEADER + paramsStr + Constants.BaiDu.SK;// 对上面wholeStr再作utf8编码tempStr = URLEncoder.encode(wholeStr, Constants.UTF_8);tempStr = MD5(tempStr);} catch (Exception e) {Logger.debug(e.getMessage());}return tempStr;}/*** 对Map内所有value作utf8编码，拼接返回结果*/public static String toQueryString(Map<?, ?> data)throws UnsupportedEncodingException {StringBuilder queryString = new StringBuilder();for (Map.Entry<?, ?> pair : data.entrySet()) {queryString.append(pair.getKey());queryString.append("=");queryString.append(URLEncoder.encode((String) pair.getValue(), Constants.UTF_8));queryString.append("&");}if (queryString.length() > 0) {queryString.deleteCharAt(queryString.length() - 1);}return queryString.toString();}/*** 来自stackoverflow的MD5计算方法，调用了MessageDigest库函数，并把byte数组结果转换成16进制*/public static String MD5(String md5) {try {java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");byte[] array = md.digest(md5.getBytes());StringBuilder sb = new StringBuilder();for (int i = 0; i < array.length; ++i) {sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));}return sb.toString();} catch (java.security.NoSuchAlgorithmException e) {Logger.debug(e.getMessage());}return null;}}发送请求也简单封装了一个http工具类：
public class SimulationRequestUtil {public static final int SUCCESS = 200;private SimulationRequestUtil() {}/*** get请求** @param url 请求路径* @return 返回参数*/public static String doGet(String url) {CloseableHttpClient client = null;try {client = HttpClients.createDefault();//发送get请求HttpResponse response = client.execute(new HttpGet(url));//请求发送成功，并得到响应if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {//读取服务器返回过来的json字符串数据return EntityUtils.toString(response.getEntity());}} catch (IOException e) {Logger.warn(e.getMessage());} finally {if (client != null) {try {client.close();} catch (Exception e) {Logger.warn(e.getMessage());}}}return null;}/*** post请求(用于key-value格式的参数)** @param url 请求路径* @param params 参数* @return 返回数据*/@SuppressWarnings("unchecked")public static String doPost(String url, Map params) {CloseableHttpClient client = null;BufferedReader in = null;try {// 定义HttpClientclient = HttpClients.createDefault();// 实例化HTTP方法HttpPost request = new HttpPost();request.setURI(new URI(url));//设置参数List<NameValuePair> nvps = new ArrayList<>();for (Iterator<Map.Entry<Object, Object>> iterator = params.entrySet().iterator(); iterator.hasNext();) {Map.Entry<Object, Object> entry = iterator.next();String name = (String) entry.getKey();String value = String.valueOf(entry.getValue());nvps.add(new BasicNameValuePair(name, value));}request.setEntity(new UrlEncodedFormEntity(nvps, StandardCharsets.UTF_8));HttpResponse response = client.execute(request);int code = response.getStatusLine().getStatusCode();if (code == SUCCESS) {//请求成功in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), StandardCharsets.UTF_8));StringBuilder sb = new StringBuilder();String line = "";String nl = System.getProperty("line.separator");while ((line = in.readLine()) != null) {sb.append(line);sb.append(nl);}return sb.toString();} else {return null;}} catch (Exception e) {Logger.warn(e.getMessage());return null;} finally {if (in != null) {try {in.close();} catch (Exception e) {Logger.warn(e.getMessage());}}if (client != null) {try {client.close();} catch (Exception e) {Logger.warn(e.getMessage());}}}}/*** post请求（用于请求json格式的参数）** @param url 请求路径* @param params 参数* @return 返回数据*/public static String doPost(String url, String params) throws Exception {CloseableHttpClient httpclient = HttpClients.createDefault();// 创建httpPostHttpPost httpPost = new HttpPost(url);httpPost.setHeader("Accept", "application/json");httpPost.setHeader("Content-Type", "application/json");String charSet = "UTF-8";StringEntity entity = new StringEntity(params, charSet);httpPost.setEntity(entity);CloseableHttpResponse response = null;try {response = httpclient.execute(httpPost);StatusLine status = response.getStatusLine();int state = status.getStatusCode();if (state == HttpStatus.SC_OK) {HttpEntity responseEntity = response.getEntity();return EntityUtils.toString(responseEntity);} else {Logger.warn("请求返回:" + state + "(" + url + ")");}} finally {if (response != null) {try {response.close();} catch (IOException e) {Logger.warn(e.getMessage());}}try {httpclient.close();} catch (IOException e) {Logger.warn(e.getMessage());}}return null;}}
2.准备就绪之后就是最重要的就是访问api接口获取想要的信息，可根据官方文档调整参数，/index.php?title=webapi/guide/webservice-geocoding
public class CityLatitudeAndLongitudeUtil {private static double EARTH_RADIUS = 6371.393;private static double rad(double d) {return d * Math.PI / 180.0;}/*** 根据地址获取经纬度信息* @param area 区域* @param location 地址* @return CityLatitudeAndLongitudeBean 城市经纬度信息*/public static CityLatitudeAndLongitudeBean getLatitudeAndLongitude(String area, String location) {CityLatitudeAndLongitudeBean result = null;try {StringBuilder url = new StringBuilder("http://api./geocoder/v2/?");LinkedHashMap<String, String> paramsMap = new LinkedHashMap<>();paramsMap.put("address", area + (StringUtils.isNotEmpty(location) ? location : StringUtils.EMPTY));paramsMap.put("output", "json");paramsMap.put("ak", Constants.BaiDu.AK);// 调用下面的toQueryString方法，对LinkedHashMap内所有value作utf8编码，拼接返回结果address=%E7%99%BE%E5%BA%A6%E5%A4%A7%E5%8E%A6&output=json&ak=yourakString paramsStr = BaiDuGeocodingSnCalUtil.toQueryString(paramsMap);url.append(paramsStr);String sn = BaiDuGeocodingSnCalUtil.getSnCalString(paramsStr);url.append("&sn=");url.append(sn);result = JSON.parseObject(SimulationRequestUtil.doGet(url.toString()), new TypeReference<CityLatitudeAndLongitudeBean>() {});if (result == null || result.getStatus() == null || result.getStatus() != 0) {return null;}} catch (Exception e) {Logger.debug(e.getMessage());}return result;}/*** 根据经纬度获取地址及周边信息* @param lat 纬度* @param lng 经度* @return ProvinceBean 城市信息*/public static ProvinceBean getProvince(String lat, String lng) {ProvinceBean result = null;try {StringBuilder url = new StringBuilder("http://api./geocoder/v2/?");LinkedHashMap<String, String> paramsMap = new LinkedHashMap<>();paramsMap.put("location", lat+","+lng);String put = paramsMap.put("output", "json");paramsMap.put("pois", "1");paramsMap.put("latest_admin", "1");paramsMap.put("ak", Constants.BaiDu.AK);String paramsStr = BaiDuGeocodingSnCalUtil.toQueryString(paramsMap);url.append(paramsStr);String sn = BaiDuGeocodingSnCalUtil.getSnCalString(paramsStr);url.append("&sn=");url.append(sn);String json = SimulationRequestUtil.doGet(url.toString());System.out.println(json);result = JSON.parseObject(json, new TypeReference<ProvinceBean>() {});if (result == null || result.getStatus() == null || result.getStatus() != 0) {return null;}} catch (Exception e) {Logger.debug(e.getMessage());}return result;}/*** 计算两个经纬度之间的距离** @param lat1* @param lng1* @param lat2* @param lng2* @return*/public static double getDistance(double lat1, double lng1, double lat2, double lng2) {double radLat1 = rad(lat1);double radLat2 = rad(lat2);double a = radLat1 - radLat2;double b = rad(lng1) - rad(lng2);double s = 2 * Math.asin(Math.sqrt(Math.abs(Math.pow(Math.sin(a / 2), 2) +Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2))));s = s * EARTH_RADIUS;s = Math.round(s * 1000);return s;}/*** 测试* @param args*/public static void main(String []args){System.out.println(getLatitudeAndLongitude("福州","福州"));System.out.println(getProvince("26.080429420698079","119.30346983854001"));}}
3.返回结果是json数据，可以自行封装需要的数据，在此附上我的信息封装类：
@Data是引入了lombok插件，简化开发，不理解的可自行百度。 其余是一些swagger注解。
/*** Description:城市经纬度**/@Datapublic class CityLatitudeAndLongitudeBean implements Serializable {private static final long serialVersionUID = 9112556610655198188L;private Integer status;private Result result;}
/*** Description:城市经纬度的结果**/@Datapublic class Result implements Serializable {private static final long serialVersionUID = 514244448398929L;private Location location;private String precise;private String confidence;private String level;}
/*** Description:经纬度城市**/@Data@ApiModel(value = "经纬度城市")public class ProvinceBean implements Serializable {private static final long serialVersionUID = 9112556610655198166L;private Integer status;private ProvinceLocation result;}
/*** Description:经纬度城市**/@Data@ApiModel(value = "经纬度城市")public class ProvinceLocation implements Serializable {private static final long serialVersionUID = 1570896924286528777L;@ApiModelProperty(value = "纬度")private String lng;@ApiModelProperty(value = "经度")private String lat;@ApiModelProperty(value = "地址信息")private AddressComponent addressComponent;@ApiModelProperty(value = "附近地址")private List<AddressPois> pois;}
*** Description:城市**/@Datapublic class AddressComponent implements Serializable {private static final long serialVersionUID = 1570896924286528788L;private String country;private String province;private String city;private String district;private String street;}
/*** Description:城市周边信息**/@Data@ApiModel(value = "城市周边信息")public class AddressPois implements Serializable {private static final long serialVersionUID = 1570896924286528755L;@ApiModelProperty(value = "地址")private String addr;@ApiModelProperty(value = "名称")private String name;@ApiModelProperty(value = "经纬度")private ProvincePoint point;@ApiModelProperty(value = "类型")private String poiType;@ApiModelProperty(value = "标签")private String tag;}
4.测试结果
CityLatitudeAndLongitudeBean(status=0, result=Result(location=Location(lng=119.30346983854001, lat=26.080429420698079), precise=0, confidence=10, level=城市))
ProvinceBean(status=0, result=ProvinceLocation(lng=null, lat=null, addressComponent=AddressComponent(country=中国, province=福建省, city=福州市, district=鼓楼区, street=乌山路), pois=[AddressPois(addr=福州市鼓楼区乌山路96号, name=福州市人民政府, point=ProvincePoint(x=119.30289474335273, y=26.0805464063163), poiType=政府机构, tag=政府机构;各级政府), AddressPois(addr=光禄新坊2座1楼16号店面, name=中国工商银行(福州灵响支行), point=ProvincePoint(x=119.30390084552356, y=26.080724886227349), poiType=金融, tag=金融;银行), AddressPois(addr=乌山路92, name=福州市机关事务管理局, point=ProvincePoint(x=119.30403559135002, y=26.08070866079226), poiType=政府机构, tag=政府机构;行政单位), AddressPois(addr=福建省福州市鼓楼区乌山路92号, name=市委大院, point=ProvincePoint(x=119.30382898108279, y=26.080789787944974), poiType=房地产, tag=房地产;住宅区), AddressPois(addr=乌山路59, name=福建移动通信大厦, point=ProvincePoint(x=119.30229287866124, y=26.079353828941117), poiType=房地产, tag=房地产;写字楼), AddressPois(addr=福州市鼓楼区加洋路26号, name=协和公寓, point=ProvincePoint(x=119.30431406605801, y=26.078940074737014), poiType=房地产, tag=房地产;住宅区), AddressPois(addr=福州市鼓楼区乌山路53号福建黎明大酒店, name=中国工商银行(福州南门支行营业室), point=ProvincePoint(x=119.30562559210215, y=26.0808790277473), poiType=金融, tag=金融;银行), AddressPois(addr=福州市鼓楼区加洋路23号, name=福建煤田地质博物馆, point=ProvincePoint(x=119.30494287991479, y=26.079004977455033), poiType=旅游景点, tag=旅游景点;博物馆), AddressPois(addr=福州市鼓楼区乌山路80号, name=山水知音, point=ProvincePoint(x=119.30537406655944, y=26.081665957572313), poiType=购物, tag=购物;商铺), AddressPois(addr=鼓楼区乌山路53号(市政府对面), name=海通商务酒店(斗西路), point=ProvincePoint(x=119.30562559210215, y=26.080294911429247), poiType=酒店, tag=酒店;二星级)]))
