google app engine for java 学习之一

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Google Java JSP Web GWT

http://www.blogjava.net/wangfun/archive/2009/04/20/266545.html

注册：[url]http://appengine.google.com/promo/java_runtime [/url]
kickstart: [url]http://code.google.com/appengine/docs/java/gettingstarted/installing.html [/url]
简单小结一下：

1. appengine for java开发包相当友好

2. appengine for java对ide也相当友好

3. appengine for java的webapp就是一个war

4. appengine for java开发包使用了geronimo

5. appengine for java使用了jdo作为数据接口

6. appengine for java支持gwt

8. appengine for java可以写jsp和servlet

9. appengine for java开发包使用了jetty和javadb?

...

上代码:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>   
<%@ page import="java.util.List" %>   
<%@ page import="javax.jdo.PersistenceManager" %>   
<%@ page import="com.google.appengine.api.users.User" %>   
<%@ page import="com.google.appengine.api.users.UserService" %>   
<%@ page import="com.google.appengine.api.users.UserServiceFactory" %>   
<%@ page import="guestbook.Greeting" %>   
<%@ page import="guestbook.PMF" %>   
<!--copyrigth http://www.bt285.cn  http://www.5a520.cn-> 
<html>   
  <head>   
    <link type="text/css" rel="stylesheet" href="/stylesheets/main.css" />   
  </head>   
  
  <body>   
  
<%   
    UserService userService = UserServiceFactory.getUserService();   
    User user = userService.getCurrentUser();   
    if (user != null) {   
%>   
<p>Hello, <%= user.getNickname() %>! (You can   
<a href="<%= userService.createLogoutURL(request.getRequestURI()) %>">sign out</a>.)</p>   
<%   
    } else {   
%>   
<p>Hello!   
<a href="<%= userService.createLoginURL(request.getRequestURI()) %>">Sign in</a>   
to include your name with greetings you post.</p>   
<%   
    }   
%>   
  
<%   
    PersistenceManager pm = PMF.get().getPersistenceManager();   
    String query = "select from " + Greeting.class.getName() + " order by date desc range 0,5";   
    List<Greeting> greetings = (List<Greeting>) pm.newQuery(query).execute();   
    if (greetings.isEmpty()) {   
%>   
<p>The guestbook has no messages.</p>   
<%   
    } else {   
        for (Greeting g : greetings) {   
            if (g.getAuthor() == null) {   
%>   
<p>An anonymous person wrote:</p>   
<%   
            } else {   
%>   
<p><b><%= g.getAuthor().getNickname() %></b> wrote:</p>   
<%   
            }   
%>   
<blockquote><%= g.getContent() %></blockquote>   
<%   
        }   
    }   
    pm.close();   
%>   
  
    <form action="/sign" method="post">   
      <div><textarea name="content" rows="3" cols="60"></textarea></div>   
      <div><input type="submit" value="Post Greeting" /></div>   
    </form>   
  
  </body>   
</html>

这是guestbook的jsp文件，麻雀虽小五脏俱全，尤其注意读数据那块！

数据库可以在\WEB-INF\appengine-generated\local_db.bin中找到。

再来看看web.xml文件：

<?xml version="1.0" encoding="utf-8"?>  
<!DOCTYPE web-app PUBLIC   
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"   
 "http://java.sun.com/dtd/web-app_2_3.dtd">  
  
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">  
    <servlet>  
        <servlet-name>guestbook</servlet-name>  
        <servlet-class>guestbook.GuestbookServlet</servlet-class>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>guestbook</servlet-name>  
        <url-pattern>/guestbook</url-pattern>  
    </servlet-mapping>  
  
    <servlet>  
        <servlet-name>sign</servlet-name>  
        <servlet-class>guestbook.SignGuestbookServlet</servlet-class>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>sign</servlet-name>  
        <url-pattern>/sign</url-pattern>  
    </servlet-mapping>  
  
    <welcome-file-list>  
        <welcome-file>guestbook.jsp</welcome-file>  
        <welcome-file>index.html</welcome-file>  
    </welcome-file-list>  
</web-app>

除此之外,appengine还有一个配置appengine-web.xml

<?xml version="1.0" encoding="utf-8"?>  
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">  
    <application></application>  
    <version>1</version>  
   <desc>http://www.5a520.cn 小说520网</desc>
    <system-properties>  
        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>  
    </system-properties>  
</appengine-web-app>

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2009-04-24 14:33
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