public class LngAndLatUtil {

	public static Map<String,Double> getLngAndLat(String address){

		Map<String,Double> map=new HashMap<String, Double>();

		 String url = "http://api.map.baidu.com/geocoder/v2/?address="+address+"&output=json&ak=你的百度地图key";

	        String json = loadJSON(url);

	        JSONObject obj = JSONObject.fromObject(json);

	        if(obj.get("status").toString().equals("0")){

	        	double lng=obj.getJSONObject("result").getJSONObject("location").getDouble("lng");

	        	double lat=obj.getJSONObject("result").getJSONObject("location").getDouble("lat");

	        	map.put("lng", lng);

	        	map.put("lat", lat);

	        }else{

	        }

		return map;

	}

	 public static String loadJSON (String url) {

	        StringBuilder json = new StringBuilder();

	        try {

	            URL oracle = new URL(url);

	            URLConnection yc = oracle.openConnection();

	            BufferedReader in = new BufferedReader(new InputStreamReader(

	                                        yc.getInputStream()));

	            String inputLine = null;

	            while ( (inputLine = in.readLine()) != null) {

	                json.append(inputLine);

	            }

	            in.close();

	        } catch (MalformedURLException e) {

	        } catch (IOException e) {

	        }

	        return json.toString();

	    }

	 public static void main(String[] args) {

		    Map<String,Double> map=LngAndLatUtil.getLngAndLat("北京故宫");

			System.out.println("(经度："+map.get("lng")+",纬度："+map.get("lat")+")");

	}

}