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:

104.063832
30.54855

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}}