首先去 http://code.google.com/intl/zh-CN/apis/maps/signup.html
我的网址中填入 你测试的页面 比如测试时 地址是 http://localhost:8080/mapTest
点击生成密钥 页面上 不止有密钥 还有密钥的使用方法（生成之前必须要先用google帐号登录，如果没有帐号 点击生成跳转到注册页面）
在项目中假如一个测试页面 Google.jsp
<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>MyEclipse Google Maps Example</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<script type="text/javascript"
//后面的key=这里就是生成的key 如果key不对 页面一片空白的
src="http://www.google.com/jsapi?key=ABQIAAAAR_pdgDF_E-mJFQXMRJVOHRRP189eykzPrrAV7tRgT92eURxrGxSfti2JdFk9U2km8cMzgQmeW3b7Iw"></script>
<script type="text/javascript">
//加载地图到 id为maps的div中
google.load("maps", "2");
var map = null;
var geocoder = null;
google.setOnLoadCallback(function initmap() {
map = new google.maps.Map2(document.getElementById("map"));
geocoder = new google.maps.ClientGeocoder();
});
</script>
<script type="text/javascript" src="resources/map.js"></script>
</head>
<body>
<h1>
MyEclipse Google Maps Example
</h1>
<hr>
<table>
<tr>
<td valign="top">
<table>
<tr>
<td valign="top" align="left">
Address:
<br>
</td>
<td />
</tr>
<tr>
<td valign="top" colspan="2">
<form onsubmit="updateAddress(addrField.value); return false">
<input type="text" id="addrField">
<input type="submit" value="Find" />
</form>
</td>
</tr>
<tr>
<td align="right">
Latitude:
</td>
<td>
<input type="text" id="latField" style=" 95px" />
</td>
</tr>
<tr>
<td align="right">
Longitude:
</td>
<td valign="top">
<input type="text" id="lngField" style=" 95px">
</td>
</tr>
</table>
</td>
<td>
<div id="map"
style="border: blue 1px solid; 320px; height: 240px">
</div>
</td>
</tr>
</table>
</body>
</html>