Android项目快速开发框架探索（Mysql + OrmLite + Hessian + Sqlite）

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"
    version="2.4">

    <servlet>
        <servlet-name>user</servlet-name>
        <servlet-class>com.nmbb.ho.server.servlet.UserServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>user</servlet-name>
        <url-pattern>/user.do</url-pattern>
    </servlet-mapping>
    
    <listener>
        <listener-class>com.nmbb.ho.server.StartupInit</listener-class>
    </listener>

</web-app>

public class StartupInit implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        try {
            TableUtils.dropTable(OrmliteHelper.getConnection(), POUser.class,
                    true);
            //创建数据库
            TableUtils.createTable(OrmliteHelper.getConnection(), POUser.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {

    }

}

@DatabaseTable(tableName = "nmbb_users")
public class POUser implements Serializable {

    /** 用户编号，6位数字 */
    @DatabaseField(generatedId = true)
    public int suid;

    /** 用户名 */
    @DatabaseField(width = 30)
    public String username;

    /** 密码 */
    @DatabaseField(width = 30)
    public String password;

    /** 昵称 */
    @DatabaseField(width = 60)
    public String nickname;

    /** 200 正常 201 数据校验错误 202用户已经存在 */
    public int status = 200;

    /** 用于放错误信息 */
    public String msg;

    public POUser() {

    }
}

/**
 * 用户Servlet
 * 
 * @author 农民伯伯
 * @see http://www.cnblogs.com/over140/archive/2013/02/19/2917231.html
 *
 */
public class UserServlet extends HessianServlet implements IUserService {

    @Override
    public POUser register(String username, String password) {
        POUser result = new POUser();

        System.out.println("[UserServlet.register]...");

        // 检测数据是否合法
        if (isEmpty(username) || isEmpty(password)) {
            result.status = 201;
            result.msg = "用户名或密码不能为空";
        } else {
            // 检测用户是否存在
            OrmliteHelper<POUser> db = new OrmliteHelper<POUser>();
            if (db.exist(POUser.class, "username", username)) {
                result.status = 202;
                result.msg = "用户名已经存在";
            } else {
                result.username = username;
                result.password = password;
                db.create(result);// 入库
                result.msg = "注册成功";
                System.out.println("create user suid:" + result.suid);
            }
        }
        return result;
    }

    @Override
    public List<POUser> query(int suid, int startIndex, int pageSize) {
        return new OrmliteHelper<POUser>().query(POUser.class, "suid", suid, startIndex, pageSize) ;
    }

    /**
     * 判断字符串是否为空
     * 
     * @param str
     * @return
     */
    public static boolean isEmpty(String str) {
        return str == null || str.length() == 0;
    }
}

public class UserActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    public void OnClickRegiger(View view) {
        new AsyncTask<Void, Void, POUser>() {

            @Override
            protected POUser doInBackground(Void... params) {
                String url = "http://192.168.68.23:8081/HOServer/user.do";
                HessianProxyFactory factory = new HessianProxyFactory();
                try {
                    factory.setDebug(true);
                    factory.setReadTimeout(5000);
                    //不设置会报 expected hessian reply at 0x48 
                    factory.setHessian2Reply(false);
                    IUserService basic = (IUserService) factory.create(IUserService.class, url, getClassLoader());
                    return basic.register("admin", "123456");

                } catch (MalformedURLException e) {
                    Log.e("UserActivity", "OnClickRegiger", e);
                } catch (Exception e) {
                    Log.e("UserActivity", "OnClickRegiger", e);
                }
                return null;
            }

            @Override
            protected void onPostExecute(POUser result) {
                if (result != null) {
                    if (result.status == 200) {
                        //保存入库
                        new DbHelper<POUser>().create(result);
                    }
                    Toast.makeText(UserActivity.this, "" + result.msg, Toast.LENGTH_LONG).show();
                }
            };

        }.execute();

    }
}