百度坐标转换 HttpURLConnection 连接失败重试代码,JS代码库,德仔网

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【JS】百度坐标转换 HttpURLConnection 连接失败重试
作者:倪闯 / 发布于2015/4/2/ 758
百度坐标转换 HttpURLConnection 连接失败重试

	package com.jttx.poi.utils;
	
	import com.mongodb.BasicDBList;
	import com.mongodb.DBObject;
	import com.mongodb.util.JSON;
	
	import java.io.BufferedInputStream;
	import java.io.IOException;
	import java.net.HttpURLConnection;
	import java.net.MalformedURLException;
	import java.net.URL;
	import java.util.logging.Logger;
	
	/**
	* Created by louis on 2015/3/24.
	*/
	/*
	 坐标转换
	 详细文档地址：http://developer.baidu.com/map/index.php?title=webapi/guide/changeposition
	
	*/
	public class CoordinateConvert {
	 private static final String ak = "kEFeESQOTRx5CR6PYGPqkPnh";
	 private static Logger logger = Logger.getLogger(CoordinateConvert.class.getName());
	
	 public static String getContent(URL url, int retryNum) {
	 HttpURLConnection connection = null;
	 BufferedInputStream bin = null;
	 boolean connected = false;
	 StringBuilder sb = new StringBuilder();
	 outer:
	 for (int retry = 0; retry <= retryNum && !connected; retry++) {
	 if (retry > 0) {
	 logger.warning("retry: " + retry + "/" + retryNum);
	 }
	 try {
	 connection = (HttpURLConnection) url.openConnection();
	 switch (connection.getResponseCode()) {
	 case HttpURLConnection.HTTP_OK:
	 connected = true;
	 break;//fine,go on
	 case HttpURLConnection.HTTP_UNAVAILABLE:
	 logger.warning("retry:unavailable 503");
	 break;
	 case HttpURLConnection.HTTP_GATEWAY_TIMEOUT:
	 logger.warning("retry:gateway timeout. 504");
	 break;
	 case HttpURLConnection.HTTP_CLIENT_TIMEOUT:
	 logger.warning("retry:client timeout 408");
	 break;
	 case HttpURLConnection.HTTP_INTERNAL_ERROR:
	 logger.warning("retry:server error 500");
	 break;
	 case HttpURLConnection.HTTP_BAD_GATEWAY:
	 logger.warning("retry:bad gateway 502");
	 break;
	 default:
	 logger.warning(" **unknown response code**.");
	 break outer;//abort
	 }
	 bin = new BufferedInputStream(connection.getInputStream());
	 int n = -1;
	 byte[] buffer = new byte[2048];
	 while ((n = bin.read(buffer, 0, buffer.length)) != -1) {
	 String line = new String(buffer, 0, n, "UTF-8");
	 sb.append(line);
	 }
	 } catch (Exception e) {
	 e.printStackTrace();
	 } finally {
	 if (connection != null)
	 connection.disconnect();
	 if (bin != null) {
	 try {
	 bin.close();
	 } catch (IOException e) {
	 e.printStackTrace();
	 }
	 }
	 }
	 }
	 return sb.toString().length() > 0 ? sb.toString() : null;
	 }
	
	 /**
	 * From
	 * 1：GPS设备获取的角度坐标;
	 * 2：GPS获取的米制坐标、sogou地图所用坐标;
	 * 3：google地图、soso地图、aliyun地图、mapabc地图和amap地图所用坐标
	 * 4：3中列表地图坐标对应的米制坐标
	 * 5：百度地图采用的经纬度坐标
	 * 6：百度地图采用的米制坐标
	 * 7：mapbar地图坐标;
	 * 8：51地图坐标
	 * <p/>
	 * To
	 * 5：bd09ll(百度经纬度坐标),
	 * 6：bd09mc(百度米制经纬度坐标);
	 */
	 public static BasicDBList convert(String coords, int from, int to, int retry) {
	 BasicDBList list = null;
	 String urlStr = String.format("http://api.map.baidu.com/geoconv/v1/?coords=%s&from=%d&%d=5&ak=%s", coords, from, to, ak);
	 try {
	 URL url = new URL(urlStr);
	 String content = getContent(url, retry);
	 DBObject dbObject = (DBObject) JSON.parse(content);
	 int status = (int) dbObject.get("status");
	 if (status != 0) {
	 return null;
	 } else {
	 list = (BasicDBList) dbObject.get("result");
	 }
	 } catch (MalformedURLException e) {
	 e.printStackTrace();
	 }
	 return list;
	 }
	
	 public static void main(String[] args) {
	 BasicDBList list = convert("121.6635041,31.13573265;121.6708963,31.13499003", 1, 5, 3);
	 System.out.println(list);
	 }
	}
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