java实现将gps坐标转化成百度坐标

package com.cz.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.text.ParseException;

import sun.misc.BASE64Decoder;

public class Gps2baidu {
	public static void main(String args[]) throws ParseException {
		System.out.println("haha");
		String aaa=changgeXY("116.397428", "39.90923");
		System.out.println(aaa);
	}

	public static String changgeXY(String xx, String yy) {
		try {
			Socket s = new Socket("api.map.baidu.com", 80);
			BufferedReader br = new BufferedReader(new InputStreamReader(
					s.getInputStream(), "UTF-8"));
			OutputStream out = s.getOutputStream();
			StringBuffer sb = new StringBuffer(
					"GET /ag/coord/convert?from=0&to=4");
			sb.append("&x=" + xx + "&y=" + yy);
			sb.append("&callback=BMap.Convertor.cbk_3976 HTTP/1.1\r\n");
			sb.append("User-Agent: Java/1.6.0_20\r\n");
			sb.append("Host: api.map.baidu.com:80\r\n");
			sb.append("Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\r\n");
			sb.append("Connection: Close\r\n");
			sb.append("\r\n");
			out.write(sb.toString().getBytes());
			String json = "";
			String tmp = "";
			while ((tmp = br.readLine()) != null) {
				// System.out.println(tmp);
				json += tmp;
			}

			int start = json.indexOf("cbk_3976");
			int end = json.lastIndexOf("}");
			if (start != -1 && end != -1&& json.contains("\"x\":\"")) {
				json = json.substring(start, end);
				String[] point = json.split(",");
				String x = point[1].split(":")[1].replace("\"", "");
				String y = point[2].split(":")[1].replace("\"", "");
				return (new String(decode(x)) + "," + new String(decode(y)));
			} else {
				System.out.println("gps坐标无效！！");
			}
			out.close();
			br.close();

		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;

	}

	/**
	 * 解码
	 * 
	 * @param str
	 * @return string
	 */
	public static byte[] decode(String str) {

		byte[] bt = null;

		try {
			BASE64Decoder decoder = new BASE64Decoder();
			bt = decoder.decodeBuffer(str);
			// System.out.println(new String (bt));
		} catch (IOException e) {
			e.printStackTrace();
		}

		return bt;
	}

}