经纬度转换（gps|百度|google）

http接口：

http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=108.953582&y=34.276165

（gps坐标转换成百度坐标）

from的值填的是原坐标；to的值填的是准备转换成的坐标；

x填的是经度值；y填的是纬度值。

备注：

 gps坐标的type=0

 google坐标的type=2

 baidu坐标的type=4

下面是java代码

package com.happysys.fatedgar;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.codehaus.jettison.json.JSONObject;

import com.happysys.erp.webapps.util.Messager;
import com.lowagie.text.pdf.codec.Base64;

public class CoordChange {

	/**
	 * 坐标转换 需要引入Javabase64.jar 和Json的一些包
	 */
	public static String Gps2Baidu(String lnt,String lat){
		String str="";
		String path = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x="
			+ lnt + "+&y=" + lat;
		try {
			// 使用http请求获取转换结果
			URL url = new URL(path);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			conn.setRequestMethod("GET");
			conn.setConnectTimeout(5 * 1000);
			InputStream inStream = conn.getInputStream();
	
			ByteArrayOutputStream outStream = new ByteArrayOutputStream();
			byte[] buffer = new byte[1024];
			int len = 0;
			while ((len = inStream.read(buffer)) != -1) {
				outStream.write(buffer, 0, len);
			}
			// 得到返回的结果
			String res = outStream.toString();
			//System.out.println(res);
			JSONObject jsonObj = new JSONObject(res);
			String err=jsonObj.getString("error");
			if ("0".equals(err)) {
				// 编码转换
				String x1 = new String(Base64.decode(jsonObj.getString("x")));
				String y1 = new String(Base64.decode(jsonObj.getString("y")));
				str=x1 + "|" + y1;
			}else{
				String x1=Messager.getInfo("std.lontitude");
				String y1=Messager.getInfo("std.latitude");
				str=x1 + "|" + y1;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return str;
	}
	
	/**
	 * gps坐标的type=0
	 * google坐标的type=2
	 * baidu坐标的type=4
	 */
	public static String CChange(String lnt,String lat,String from,String to){
		String str="";
		String path = "http://api.map.baidu.com/ag/coord/convert?from="+from+"&to="+to+"&x="
			+ lnt + "+&y=" + lat;
		try {
			// 使用http请求获取转换结果
			URL url = new URL(path);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			conn.setRequestMethod("GET");
			conn.setConnectTimeout(5 * 1000);
			InputStream inStream = conn.getInputStream();
	
			ByteArrayOutputStream outStream = new ByteArrayOutputStream();
			byte[] buffer = new byte[1024];
			int len = 0;
			while ((len = inStream.read(buffer)) != -1) {
				outStream.write(buffer, 0, len);
			}
			// 得到返回的结果
			String res = outStream.toString();
			//System.out.println(res);
			JSONObject jsonObj = new JSONObject(res);
			String err=jsonObj.getString("error");
			if ("0".equals(err)) {
				// 编码转换
				String x1 = new String(Base64.decode(jsonObj.getString("x")));
				String y1 = new String(Base64.decode(jsonObj.getString("y")));
				str=x1 + "|" + y1;
			}else{
				String x1=Messager.getInfo("std.lontitude");
				String y1=Messager.getInfo("std.latitude");
				str=x1 + "|" + y1;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return str;
	}
	
	public static void main(String[] args) {
		String x = "108.953582";
		String y = "34.276165";
		System.out.println(Gps2Baidu(x,y));
		System.out.println(CChange(x,y,"0","4"));
	}
}