调用googleMap的一个小小应用

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google Map

网络应用 Google JavaScript Servlet json

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[

    //]]>
    </script>
</head>
<body onload="load()" onunload="GUnload()">
    <div id="map" style="width: 800px; height: 600px"></div>
</body>
</html>