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[Java教程]获取某地的经纬度 通过经纬度获取相应的地理位置


  最近要通过一个经纬度判断该经纬度是否位于某个地区内,所以通过网上查找资料,整合后出了下面的内容。

1、通过地址获取改地址的经纬度

 /**   * @param addr   * 查询的地址   * @return   * @throws IOException   */  public Object[] getCoordinate(String addr) throws IOException {     String lng = null;//经度    String lat = null;//纬度    String address = null;     try {       address = java.net.URLEncoder.encode(addr, "UTF-8");     }catch (UnsupportedEncodingException e1) {       e1.printStackTrace();     }     String key = "f247cdb592eb43ebac6ccd27f796e2d2";     String url = String .format("http://api.map.baidu.com/geocoder?address=%s&output=json&key=%s", address, key);         URL myURL = null;     URLConnection httpsConn = null;     try {       myURL = new URL(url);     } catch (MalformedURLException e) {       e.printStackTrace();     }     InputStreamReader insr = null;    BufferedReader br = null;    try {       httpsConn = (URLConnection) myURL.openConnection();// 不使用代理       if (httpsConn != null) {         insr = new InputStreamReader( httpsConn.getInputStream(), "UTF-8");         br = new BufferedReader(insr);         String data = null;         int count = 1;        while((data= br.readLine())!=null){           if(count==5){            lng = (String)data.subSequence(data.indexOf(":")+1, data.indexOf(","));//经度            count++;          }else if(count==6){            lat = data.substring(data.indexOf(":")+1);//纬度            count++;          }else{            count++;          }        }       }     } catch (IOException e) {       e.printStackTrace();     } finally {      if(insr!=null){        insr.close();      }      if(br!=null){        br.close();      }    }  return new Object[]{lng,lat};   } 

 

测试

 public static void main(String[] args) throws IOException {    GetLocation getLatAndLngByBaidu = new GetLocation();    Object[] o = getLatAndLngByBaidu.getCoordinate("成都市天府四街");        System.out.println(o[0]);//经度    System.out.println(o[1]);//纬度  }

 

结果:

104.06383230.54855

 

 

2、通过某个经纬度获取该经纬度的地址,返回的是一个json格式的对象(需要引入json.org.jar包的JSONObject类进行解析),这里只实现了通过经纬度查询出该经纬度所在的市,其他信息再json中都有,只需通过解析即可得出,这里不给出其他信息的获取方式。

public static void getCityFromLngAndlat(){//通过修改这里的location(经纬度)参数,即可得到相应经纬度的详细信息String url2 = "http://api.map.baidu.com/geocoder/v2/?ak=pmCgmADsAsD9rEXkqWNcTzjd&location=22.75424,112.76535&output=json&pois=1 ";    URL myURL2 = null;     URLConnection httpsConn2 = null;     try {       myURL2 = new URL(url2);     } catch (MalformedURLException e) {       e.printStackTrace();     }     InputStreamReader insr2 = null;    BufferedReader br2 = null;    try {       httpsConn2 = (URLConnection) myURL2.openConnection();// 不使用代理       if (httpsConn2 != null) {         insr2 = new InputStreamReader( httpsConn2.getInputStream(), "UTF-8");         br2 = new BufferedReader(insr2);         String data2 = br2.readLine();         try        {                   //解析得到的json格式数据          JSONObject dataJson = new JSONObject(data2);          JSONObject result = dataJson.getJSONObject("result");          JSONObject addressComponent = result.getJSONObject("addressComponent");          String city = addressComponent.getString("city");                    System.out.println("city = " + city);                        } catch (JSONException e)        {          e.printStackTrace();        }      }     } catch (IOException e) {       e.printStackTrace();     } finally {      if(insr2!=null){        insr2.close();      }      if(br!=null){        br2.close();      }    }}

 获取到的json原始数据如下

{"status":0,"result":{"location":{"lng":112.76535000506,"lat":22.754240005123},"formatted_address":"广东省佛山市高明区X492","business":"","addressComponent":{"city":"佛山市","country":"中国","direction":"","distance":"","district":"高明区","province":"广东省","street":"X492","street_number":"","country_code":0},"pois":[{"addr":"佛山市高明区","cp":"NavInfo","direction":"东北","distance":"680","name":"皂幕山泉","poiType":"公司企业","point":{"x":112.76102978437,"y":22.750226120112},"tag":"公司企业","tel":"","uid":"ea4a3dc9e82219534e5547fc","zip":""},{"addr":"四九二县道井头圩附近","cp":"NavInfo","direction":"东北","distance":"690","name":"乡下酒楼","poiType":"美食","point":{"x":112.76288029372,"y":22.748959622733},"tag":"美食;中餐厅","tel":"","uid":"b292b3aa9bf25c28be48422f","zip":""},{"addr":"四九二县道井头村附近","cp":"NavInfo","direction":"东北","distance":"724","name":"雄英酒楼","poiType":"美食","point":{"x":112.76211673404,"y":22.74900128402},"tag":"美食;中餐厅","tel":"","uid":"abe37f62d7e119b6cd04efd2","zip":""},{"addr":"四九二县道井头村附近","cp":"NavInfo","direction":"东北","distance":"730","name":"名峰酒楼","poiType":"美食","point":{"x":112.75995181776,"y":22.750776042908},"tag":"美食;中餐厅","tel":"","uid":"2fb890627b93c3a7c91b95e2","zip":""},{"addr":"杨和镇","cp":"NavInfo","direction":"东北","distance":"757","name":"山村菜馆","poiType":"美食","point":{"x":112.76165859823,"y":22.748934625955},"tag":"美食;中餐厅","tel":"","uid":"637df60ac6f49c7241afe68b","zip":""}],"poiRegions":[],"sematic_description":"皂幕山泉东北680米","cityCode":138}}