java调用百度地图api接口---转换非百度坐标和根据百度坐标转换地理位置

jar包百度云链接：http://pan.baidu.com/s/1slm3f6d；密码：mijs

步骤：

1、首先需要去百度地图开放平台上申请秘钥，地址http://lbsyun.baidu.com/index.php，填写相应信息。假设现在已经有了秘钥，即ak；



2、为程序导入相应的jar包，调用百度地图接口时返回的HTTP/HTTPS请求的数据类型为json或xml格式，json在转换时较为方便，所以我使用的是json相应的jar包；



3、编写获取地址工具类(该工具类中主要的方法为将非百度地图坐标转换为百度坐标，根据百度坐标转换为相应的地理位置信息)，代码如下：
import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.HttpURLConnection;

import java.net.InetSocketAddress;

import java.net.Proxy;

import java.net.URL;

import net.sf.json.JSONObject;

/**

 * 获取地址、转换百度经纬度 工具类

 *

 */

public class GetAddressByLatitudeAndLongitude {

/**
* 根据提供的经纬度，代理地址、端口号和ak获取地址
* @param longitude:经度
* @param latitude：纬度
* @param proxyAddress：代理地址(有的公司网络是有代理的，这时候如果不设置则会出现连接超时的异常)
* @param proxyPort：代理端口
* @param ak：秘钥
* @return
* @throws IOException
*/
public static JSONObject getAddress(String longitude, String latitude, String proxyAddress, String proxyPort, String ak) throws Exception {  
URL url = new URL("http://api.map.baidu.com/geocoder/v2/?ak=" + ak +   
"&location=" + latitude  + "," + longitude + "&output=json");  

JSONObject object = getJSONObjectByUrl(url,proxyAddress,proxyPort);

// 返回的json串格式 {"status":0,"result":{"location":{"lng":96.32298699999997,"lat":39.98342407140365},"formatted_address":"甘肃省酒泉市瓜州县","business":"","addressComponent":{"country":"中国","country_code":0,"province":"甘肃省","city":"酒泉市","district":"瓜州县","adcode":"620922","street":"","street_number":"","direction":"","distance":""},"pois":[],"poiRegions":[],"sematic_description":"","cityCode":37}}

return object;
} 

/**
* 根据参数将非百度坐标转换为百度坐标，供getAddress方法使用
* @param longitude
* @param latitude
* @param proxyAddress
* @param proxyPort
* @param ak
* @return
* @throws Exception
*/
public static JSONObject convertCoordinate(String longitude, String latitude, String proxyAddress, String proxyPort, String ak) throws Exception{

URL url = new URL("http://api.map.baidu.com/geoconv/v1/?coords="+ longitude + "," + latitude +"&from=1&to=5&ak="+ak);
   
JSONObject object = getJSONObjectByUrl(url,proxyAddress,proxyPort);

//返回的json格式 {"status":0,"result":[{"x":114.23074952312,"y":29.57908262908}]}

return object;

}
 
/**
 * 根据不同的url获取不同的json串
 * @param url
 * @param proxyAddress
 * @param proxyPort
 * @return
 * @throws Exception
 */
public static JSONObject getJSONObjectByUrl(URL url, String proxyAddress, String proxyPort) throws Exception{
 
HttpURLConnection connection = null;
//如果代理地址没有或是代理的端口号为0，则说明该网络不存在代理
if("notFound".equals(proxyAddress) || "0".equals(proxyPort)){
connection = (HttpURLConnection) url.openConnection();
}else{
@SuppressWarnings("static-access")
Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyAddress, Integer.parseInt(proxyPort)));
connection = (HttpURLConnection) url.openConnection(proxy); 
}
 
connection.addRequestProperty("User-Agent", "Mozilla/4.0");
/** 
 * 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.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);  
connection.setUseCaches(false); 
connection.addRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream(), "utf-8");  
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();  
JSONObject obj = null;
//StringUtils.isBlank(str)判断转化后的str是否为空字符串
if(!StringUtils.isBlank(str)){
     //将str转换为json
    obj = JSONObject.fromObject(str);  
}
return obj;   
}

}

4、测试

测试转换坐标方法

JSONObject coordinate = GetAddressByLatitudeAndLongitude.convertCoordinate(longitude, latitude, proxyAddress, proxyPort, ak);

JSONArray jsonArray = coordinate.getJSONArray("result");//retData下为一个JSONArray,只有一个数据  
longitude = jsonArray.getJSONObject(0).getString("x");
latitude = jsonArray.getJSONObject(0).getString("y");

测试根据坐标获取地址方法

JSONObject obj = GetAddressByLatitudeAndLongitude.getAddress(longitude, latitude, proxyAddress, proxyPort, ak);
// json 内容为 {"status":0,"result":{"location":{"lng":96.32298699999997,"lat":39.98342407140365},"formatted_address":"甘肃省酒泉市瓜州县","business":"","addressComponent":{"country":"中国","country_code":0,"province":"甘肃省","city":"酒泉市","district":"瓜州县","adcode":"620922","street":"","street_number":"","direction":"","distance":""},"pois":[],"poiRegions":[],"sematic_description":"","cityCode":37}}
if( obj != null){
String district = obj.getJSONObject("result").getJSONObject("addressComponent").getString("district");

   }