java调用百度地图API反解析经纬码返回地址信息

import java.net.URL;import java.util.Map;import java.util.HashMap;import java.io.IOException;import java.io.InputStream;import java.net.URLConnection;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import org.apache.commons.lang.StringUtils;public class BaiduAPI {private static String ak = "5ef2641d89438a6e708db122820cf1d2";        public static Map<String, String> testPost(String x, String y) throws IOException {        URL url = new URL("http://api.map.baidu.com/geocoder?" + ak + "=您的密钥" +         "&callback=renderReverse&location=" + x                        + "," + y + "&output=json");        URLConnection connection = url.openConnection();        /**         * 然后把连接设为输出模式。URLConnection通常作为输入来使用，比如下载一个Web页。         * 通过把URLConnection设为输出，你可以把数据向你个Web页传送。下面是如何做：         */        connection.setDoOutput(true);        OutputStreamWriter out = new OutputStreamWriter(connection                .getOutputStream(), "utf-8");//        remember to clean up        out.flush();        out.close();//        一旦发送成功，用以下方法就可以得到服务器的回应：        String res;        InputStream l_urlStream;        l_urlStream = connection.getInputStream();        BufferedReader in = new BufferedReader(new InputStreamReader(                l_urlStream,"UTF-8"));        StringBuilder sb = new StringBuilder("");        while ((res = in.readLine()) != null) {            sb.append(res.trim());        }        String str = sb.toString();        System.out.println(str);        Map<String,String> map = null;if(StringUtils.isNotEmpty(str)) {int addStart = str.indexOf("formatted_address\":");int addEnd = str.indexOf("\",\"business");if(addStart > 0 && addEnd > 0) {String address = str.substring(addStart+20, addEnd);map = new HashMap<String,String>();map.put("address", address);return map;}}return null;    }public static void main(String[] args) throws IOException {    Map<String, String> json = BaiduAPI.testPost("29.542938", "114.064022");        System.out.println("address :" + json.get("address"));    }}