高德GCJ-02坐标转换
高德GCJ-02坐标转换
2015年7月23日
1 高德：WGS84-》GCJ-02
高德使用GCJ-02坐标系统，所以可以直接使用其坐标转换API。其Web服务使用无限制，注册后可以批量转换。
1.1 HTTP坐标转换
注册key之后，使用http请求。
http://restapi.amap.com/v3/assistant/coordinate/convert?locations=116.481499,39.990475&coordsys=gps&output=xml&key=c67d73f88613f4f574df092a93602c43
返回结果
参考：
http://lbsbbs.amap.com/forum.php?mod=viewthread&tid=724&highlight=%E5%9D%90%E6%A0%87%E8%BD%AC%E6%8D%A2
1.2 后台坐标转换：使用servlet调用高德转换的http服务。
转换文档参见：http://lbsbbs.amap.com/forum.php?mod=viewthread&tid=724&extra=&page=9
高德提供的服务是以XML的方式返回。所以在使用时需要在后台调用服务，并将返回的XML结果转换为需要格式。
1.2.1示例：将WGS84坐标转换为GCJ-02坐标。
package com.thbd;
importjava.io.BufferedReader;
import java.io.IOException;
importjava.io.InputStreamReader;
import java.io.PrintWriter;
importjavax.servlet.ServletConfig;
import javax.servlet.ServletException;
importjavax.servlet.annotation.WebInitParam;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
import java.net.URL;
importjava.net.URLConnection;
import java.util.List;
import java.util.Map;
/**
* Servlet implementation class GCJTranlate
*/
@WebServlet(
urlPatterns = { "/GCJTranlate" },
initParams = {
@WebInitParam(name = "lng", value ="0", description = "longitude"),
@WebInitParam(name = "lat", value ="0", description = "latitude")
})
public class GCJTranlateextends HttpServlet {
private static final long serialVersionUID = 1L;
/**
*Default constructor.
*/
public GCJTranlate() {
// TODO Auto-generated constructor stub
}
/**
* @seeServlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException{
// TODO Auto-generated method stub
}
/**
* @seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//create url
String lng=request.getParameter("lng");
String lat=request.getParameter("lat");
System.out.println(lng+","+lat);
StringstrUrl="http://restapi.amap.com/v3/assistant/coordinate/convert?locations="+lng+","+lat+"&coordsys=gps&output=xml&key=c67d73f88613f4f574df092a93602c43";
//get translate
MyHttpRequest req=new MyHttpRequest();
String strResult=req.requestHttpGet(strUrl);
//create output
response.setContentType("text/html");
PrintWriter pw=response.getWriter();
pw.println("<h1>Hello,I amServlet.</h1>");
pw.println(strResult);
}
/**
* @seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request,response);
}
}
/**
* @author [email protected]
*
*/
class MyHttpRequest{
public StringrequestHttpGet(String strUrl){
String strResult="";
try {
//send post request
URL url=new URL(strUrl);
HttpURLConnection conn=(HttpURLConnection)url.openConnection();
conn.connect();
Map<String,List<String>>mapHeader=conn.getHeaderFields();
for(String key:mapHeader.keySet()){
System.out.println(key+"="+mapHeader.get(key));
}
//read response
if(conn.getResponseCode()==200){
//read response
BufferedReader in = new BufferedReader(newInputStreamReader(conn.getInputStream()));
String strLine=null;
while((strLine=in.readLine())!=null){
strResult+=strLine;
}
System.out.println("response="+strResult);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return strResult;
}
}
1.2.2示例：将WGS84坐标转换为GCJ-02坐标,并转换为需要的格式。
package com.thbd;
importjava.io.BufferedReader;
import java.io.IOException;
importjava.io.InputStreamReader;
import java.io.PrintWriter;
importjavax.servlet.ServletConfig;
importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebInitParam;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjava.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
importcom.thoughtworks.xstream.*;
/**
* Servlet implementation class GCJTranlate
*/
@WebServlet(
urlPatterns = { "/GCJTranlate" },
initParams = {
@WebInitParam(name = "lng", value ="0", description = "longitude"),
@WebInitParam(name = "lat", value ="0", description = "latitude")
})
public class GCJTranlateextends HttpServlet {
private static final long serialVersionUID = 1L;
/**
*Default constructor.
*/
public GCJTranlate() {
// TODO Auto-generated constructor stub
}
/**
* @seeServlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException{
// TODO Auto-generated method stub
}
/**
* @seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//create url
String lng=request.getParameter("lng");
String lat=request.getParameter("lat");
System.out.println(lng+","+lat);
StringstrUrl="http://restapi.amap.com/v3/assistant/coordinate/convert?locations="+lng+","+lat+"&coordsys=gps&output=xml&key=c67d73f88613f4f574df092a93602c43";
//get translate
MyHttpRequest req=new MyHttpRequest();
StringstrResult=req.requestHttpGet(strUrl);//req.requestGet(strUrl);
GCJPointTranslator pt=new GCJPointTranslator(strResult);
String[] ptArray=pt.getPoint();
//create output
response.setContentType("text/html");
PrintWriter pw=response.getWriter();
pw.println("<h1>Hello,I amServlet.</h1>");
pw.println(Arrays.toString(ptArray));
}
/**
* @seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request,response);
}
}
/**
* @author [email protected]
*
*/
class MyHttpRequest{
public String requestGet(String strUrl){
String strResult="";
try {
//send post request
URL url=new URL(strUrl);
URLConnection conn=url.openConnection();
conn.connect();
Map<String,List<String>>mapHeader=conn.getHeaderFields();
for(String key:mapHeader.keySet()){
System.out.println(key+"="+mapHeader.get(key));
}
//read response
BufferedReader in = new BufferedReader(newInputStreamReader(conn.getInputStream()));
StringstrLine=null;
while((strLine=in.readLine())!=null){
strResult+=strLine;
}
System.out.println("response="+strResult);
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return strResult;
}
public String requestHttpGet(String strUrl){
String strResult="";
try {
//send post request
URL url=new URL(strUrl);
HttpURLConnection conn=(HttpURLConnection)url.openConnection();
conn.connect();
Map<String,List<String>>mapHeader=conn.getHeaderFields();
for(String key:mapHeader.keySet()){
System.out.println(key+"="+mapHeader.get(key));
}
//read response
if(conn.getResponseCode()==200){
//read response
BufferedReader in = new BufferedReader(newInputStreamReader(conn.getInputStream()));
String strLine=null;
while((strLine=in.readLine())!=null){
strResult+=strLine;
}
System.out.println("response="+strResult);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return strResult;
}
}
class GCJPointTranslator{
private String m_strResponse;
/**
* @return thestrResponse
*/
public String getResponse() {
return m_strResponse;
}
/**
* @param strResponse thestrResponse to set
*/
public void setResponse(String strResponse) {
this.m_strResponse = strResponse;
}
public GCJPointTranslator(String strResponse) {
// TODO Auto-generated constructor stub
setResponse(strResponse);
}
public String[] getPoint(){
XStream xs=new XStream();
//map
xs.alias("response", GCJPoint.class);
//xml to pojo
GCJPoint pt2=(GCJPoint)xs.fromXML(getResponse());
System.out.println("fromXML=status:"+pt2.status+",info:"+pt2.info+",locations:"+pt2.locations);
String[] pt=pt2.locations.split(",");
return pt;
}
}
class GCJPoint{
public int status;
public String info;
public String locations;
}