调用googleMap的一个小小应用
google API中文同步文档:http://www.codechina.org/doc/google/gmapapi/
该例子是建立在网上 前辈的功劳的基础之上的：
通过一个servlet来解析，得到要查询地址的经度和纬度：
package cn.org.map;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MapServlet extends HttpServlet {
private static final long serialVersionUID = -6023775612606386229L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
/**
* 这里采用的是 csv格式的展现：例如：200,9,34.2334040,108.8691760，按照逗号区分。这里要提取的是后面2个值。一个表示"经度",另外一个表示"纬度"
* 这里在地图上面显示的是一个 位置
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String addressOrPoint = request.getParameter("addressOrPoint");
System.out.println("--addressOrPoint--:"+addressOrPoint);
if(addressOrPoint !=null && !"".equals(addressOrPoint)){
String data = parseAddressAndPoint(addressOrPoint,"csv", "abcdefg");//获得的结果
if(data !=null ){
String[] strArr = data.split(",");
request.setAttribute("xxx", strArr[2]);//经度
request.setAttribute("yyy", strArr[3]);//纬度
}
}
request.getRequestDispatcher("index.jsp").forward(request, response);
}
public void init() throws ServletException {
}
/**
* 解析地址和反解析纠经度
* @param addressOrPoint : 中英文地址，或者是 纬经度，不是经纬度
* @param outPutType :这三个数据类型 : xml、json、csv 注：输出格式建议用JSON或CSV，XML格式有时候不能正常显示，比如 中国：35.8616600,104.1953970
* @param googleKey : 如果项目发布在网络上，可能要从GOOGLE申请一个GOOGLE MAP KEY才能正常使用
* 参考：http://code.google.com/intl/zh-CN/apis/maps/documentation/services.html#Geocoding_Object
*/
public String parseAddressAndPoint( String addressOrPoint, String outPutType, String googleKey){
try {
// http://ditu.google.cn 而不用 http;//map.google.com 原因是不能正常解析中文
String url = "http://ditu.google.cn/maps/geo?output="+outPutType+"&q="+java.net.URLEncoder.encode(addressOrPoint,"UTF-8")+"&sensor=false&key="+googleKey;
URL myUrl = new URL(url);
URLConnection httpConn = myUrl.openConnection();
InputStreamReader isr = new InputStreamReader(httpConn.getInputStream(),"UTF-8");//读取数据，并设置数据编码
int responseInt = isr.read();
StringBuffer sb = new StringBuffer();
while(responseInt != -1){
sb.append((char)responseInt);
responseInt = isr.read();
}
String str = sb.toString();
System.out.print(str);
return str;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
} catch (MalformedURLException e) {
e.printStackTrace();
return null;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
welcome页面：
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'welcome.jsp' starting page</title>
</head>
<body>
<form action="MapServlet.do" method="post">
<table align="center" width="400" border="1">
<tr><td align="right">地点</td><td align="left"><input name="addressOrPoint"></td></tr>
<tr><td colspan="2" align="center"><input type="submit" value="提交"></td></tr>
</table>
</form>
</body>
</html>
转向页面：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Google Maps JavaScript API Example</title>
<script src="http://maps.google.com/maps?file=api&v=2&key=abcdefg"
type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
function load() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
//var center = new GLatLng(34.2351770, 108.8923490);
var center = new GLatLng(${xxx}, ${yyy});
map.setCenter(center, 13);
//GMarker定义显示标记，draggable: false 表示标记不允许拖动
var marker = new GMarker(center, {draggable: false});
map.addOverlay(marker);
}
}
//]]>
</script>
</head>
<body onload="load()" onunload="GUnload()">
<div id="map" style="width: 800px; height: 600px"></div>
</body>
</html>