Android游戏开发之服务器端

      在做游戏开发的时候，很多游戏都会提供一个全球分数排名的的功能，这就需要使用服务器了，当然，你可以选择搭建自己的服务器，但从成本，稳定性和开发周期上看，我认为Google AppEngine是个很不错的选择，现在Google AppEngine关于Python的参考资料比较详尽，Java的就比较少，所以我把我写的小Demo放上来，做抛砖引玉之用，因为我也是初学者，所以demo一切从简，大侠请不要见笑哦!

 

Demo1：对象的存储：

 

步骤1.定义JavaBean：

 

package com.ray.test;

import java.util.Date;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

//标记对象可以持久化
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Employee {

    //标记主键，作以后查询之用
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private String firstName;

    @Persistent
    private String lastName;

    @Persistent
    private Date birthDate;

    public Employee(String firstName, String lastName, Date birthDate) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.birthDate = birthDate;
    }

    public String getFirstName() {
        return firstName;
    }
}

 

 步骤2.存取Bean(可以写在Servlet的doGet()或者doPost()里面):

 

package com.ray.test;

import java.io.IOException;
import java.util.Date;
import javax.jdo.PersistenceManager;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class HelloServlet extends HttpServlet {
    public void doGet(HttpServletRequest req,
            HttpServletResponse resp)throws IOException {

        resp.setContentType("text/plain");

        Employee e = new Employee("Alfred", "Smith", new Date());
        //获取用以存取对象的PersistenceManager
        PersistenceManager pm = PMF.get().getPersistenceManager();

        try {
            //存储对象
            resp.getWriter().println("saving object!");
            pm.makePersistent(e);
        }catch(Exception ex){
            resp.getWriter().println("cannot persistent!");
            ex.printStackTrace();
        }
        finally {
            pm.close();
        }

        try{
            //再次获取用以存取对象的PersistenceManager
            pm = PMF.get().getPersistenceManager();
            //由主键检索对象，Alfred之前被定义为主键的
            Employee newE = pm.getObjectById(Employee.class, "Alfred");
            //读取新对象的信息检测对象检索是否成功
            resp.getWriter().println("Employee:"+newE.getFirstName());
        }catch(Exception ex){
            ex.printStackTrace();
            resp.getWriter().println("cannot get data!");
            pm.close();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req,
            HttpServletResponse resp)throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

 

 其中PMF类的代码如下，没看错应该是个单例模式：

 

package com.ray.test;

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;

public final class PMF {
    private static final PersistenceManagerFactory pmfInstance =
        JDOHelper.getPersistenceManagerFactory("transactions-optional");

    private PMF() {}

    public static PersistenceManagerFactory get() {
        return pmfInstance;
    }
}

 

 Demo2.使用Google 账户认证服务：

 

package com.ray.test;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

public class GoogleAccount extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        //创建用户服务
        UserService userService = UserServiceFactory.getUserService();

        String thisURL = req.getRequestURI();
        //通过请求对象的 getUserPrincipal() 方法测试用户是否使用 Google 帐户登录
        if (req.getUserPrincipal() != <span

  


  
    
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