谷歌地图坐标转换百度地图坐标

 功能代码

httpclient方式请求百度的转换地址

http://api.map.baidu.com/ag/coord/convert?from=2&to=4&x=&y=

拿到的是转换后的json数据，但是坐标值是base64加密过的字符，需要解密一下

 

import java.io.IOException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;

public class BaiduMapUtils {
	
	public static final String googleToBaiduUrl = "http://api.map.baidu.com/ag/coord/convert?from=2&to=4&x=#x#&y=#y#";
	
	public static String httpClientForGet(String url){
		HttpClient client = new HttpClient();
		GetMethod getMethod = new GetMethod(url);
		getMethod.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8"); 
		
		try {
			client.executeMethod(getMethod);
			if (getMethod.getStatusCode() == HttpStatus.SC_OK) {
				return getMethod.getResponseBodyAsString();
			}
		} catch (HttpException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			getMethod.releaseConnection();
		}
		return "";
	}
	
	/**
	 * 转换谷歌为百度坐标
	 * @param x 经度
	 * @param y	纬度
	 * @return 获取转换过的百度坐标
	 */
	public static Map<String, Object> googleToBaidu(Double x, Double y){
		Map<String, Object> map = new HashMap<String, Object>();
		
		String relt = httpClientForGet(getGoogleToBaiduUrl(String.valueOf(x), String.valueOf(y)));
		if(DyString.isNotEmpty(relt))
			map = JsonUtils.parserToMap(relt);
		
		map.put("x", Base64Utils.decode(map.get("x")));
		map.put("y", Base64Utils.decode(map.get("y")));
		
		return map;
	}
	
	/**
	 * 获取请求地址
	 * 
	 * @param x
	 * @param y
	 * @return
	 */
	public static String getGoogleToBaiduUrl(String x, String y){
		return googleToBaiduUrl.replace("#x#", x).replace("#y#", y);
	}
	
	/**
	 * URL中文字符编码
	 * @param url
	 * @return
	 */
	public static String encode(String s){
		return URLEncoder.encode(s);
	}
	
	public static void main(String[] args) {
		System.out.println(googleToBaidu(31.2306192233586, 121.446663737297));
	}
}

 

 

Base64Utils代码

 

使用apache的commons包下面的base64工具类

 

 

package com.dooioo.common.utils;

import org.apache.commons.codec.binary.Base64;

/**
 * base64加密解密工具 使用apache工具包
 * 
 * @author 刘兴
 * 
 */
public class Base64Utils {

	/**
	 * base64加密字符串
	 * 
	 * @param s
	 * @return
	 */
	public static String encode(Object s) {
		if (s == null)
			return null;
		Base64 base64 = new Base64();
		byte[] enbytes = base64.encode(String.valueOf(s).getBytes());
		return new String(enbytes);
	}

	/**
	 * base64解密字符串
	 * 
	 * @param s
	 * @return
	 */
	public static String decode(Object s) {
		if (s == null)
			return null;
		Base64 base64 = new Base64();
		byte[] debytes = base64.decode(String.valueOf(s).getBytes());
		return new String(debytes);
	}

	public static void main(String[] a) {
		System.out.println(Base64Utils.decode("MTE2LjI2MTA5OTEyMjE="));
	}
}

 

 

DyString类是一个自定义的字符串处理工具类，可以调用apache的工具类StringUtils.isEmpty或isNotEmpty

JsonUtils类是自定义的json字符串处理工具类，内部功能是将json字符串转换成map对象