handler | 易学教程

SpringMVC——概述

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Spring 为展现层提供的基于 MVC 设计理念的优秀的Web 框架，是目前最主流的 MVC 框架之一 Spring3.0 后全面超越 Struts2，成为最优秀的 MVC 框架 Spring MVC 通过一套 MVC 注解，让 POJO 成为处理请求的控制器，而无须实现任何接口。支持 REST 风格的 URL 请求采用了松散耦合可插拔组件结构，比其他 MVC 框架更具扩展性和灵活性一、MVC ：Model-View-Control 　　框架性质的C 层要完成的主要工作：封装web 请求为一个数据对象、调用业务逻辑层来处理数据对象、返回处理数据结果及相应的视图给用户。二、简要概述springmvc 　　Spring C 层框架的核心是 DispatcherServlet，它的作用是将请求分发给不同的后端处理器，也即使用了一种被称为Front Controller 的模式。 Spring的C 层框架使用了后端控制器来、映射处理器和视图解析器来共同完成C 层框架的主要工作。并且spring 的C 层框架还真正地把业务层处理的数据结果和相应的视图拼成一个对象，即我们后面会经常用到的ModelAndView 对象。三、简析spring mvc 工作原理启动服务器，根据web.xml 的配置加载前端控制器（也称总控制器） DispatcherServlet

redis删除指定前缀的缓存

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redis作为缓存服务器为MySQL数据库提供较高的防御性，对于一些数据的查询可以直接从缓存中可以进行查询。但是，某些情况下，我们需要清除缓存。以下场景：公司经常做活动，每个活动都存在大量的数据。在新活动进行测试的时候，也会产生一些缓存，但是删除这些缓存如果不能批量删除就有点烦了。在写活动的时候，为了保证活动的缓存不冲突，用自己姓名的前缀及活动的英文名作为前缀。缓存在很大程度上能够帮助我们降低服务器的访问压力，但是也要防止缓存失效的情况，缓存并不能作为我们的最终依靠。首先在缓存中查询，如果缓存中不存在再去mysql数据库中查询，当数据库中真的不存在的时候，才能确定该查询的数据不存在；因此在数据库中查到数据的时候，再将该数据写入缓存。 ------------------------------------------------------------------------------------------------------ 如何删除指定前缀的redis。。。我们一开始给redis封装了一个类库 <?php class RedisClass { static $_instance; //存储对象 public $handler ; private function __construct($dbindex = 0) { global $_G ; $data =

How can I pass message via Handler in Android?

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问题 I'm learning how work handler in Android. I did Android server and socket class. I want send some message (i.e. "New Connect") from socket to mainactivity, when somebody connect to server. I can't figure out how to pass from socket to mainactivity. (More in comments) HttpServerActivity.java public class HttpServerActivity extends Activity implements OnClickListener{ private SocketServer s; private static final int READ_EXTERNAL_STORAGE = 1; Button btn1, btn2; // There I'm trying to send

trying to redirect from an ashx page to an aspx page

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问题 I have been trying to redirect to an aspx page along with a QueryString through an Ajax call but even thought the handler is called the redirect does not take place. public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string searchValue = context.Request["txtBoxValue"].ToString(); context.Response.Redirect("SearchResults.aspx?search=" + searchValue); } $.ajax({ url: 'Handlers/SearchContent.ashx', data: { 'txtBoxValue': txtBoxValue }, success:

android sound gets disabled after sometime

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问题 i want to check how the service feature set in android works. to check it, i have a controller class that will start the service. in the service i have a handler that executes a function every minute.the function plays the sound. everything works well when the screen is on but after the screen goes dark(off), the sound is heard about 2-3 times (2-3 minutes) and then it stops... any idea why? and how can i make it (execute the sound function)work every minute? 回答1: When the phone goes into

Can't handle UI after reconnecting to the server

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问题 I'm developing an Android app that requires me to establish a connection with the server and changing the App UI due to processing results of the received responses, I'm using java synchronous socket programming to handle that connection and a Handler to handler UI changes. Every thing is working efficiently but when loosing the connection and reconnect again, The Input received efficiently and handled by processing very well and any depending threads running perfectly but when coming to any

Activities and services using handlers

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问题 Hi I am trying to use several services in an application, i wish to re-run the services after a certain period of time after fetching the changed values from one of the services. Pls guide me on implementing this using handlers/timers/broadcast receivers. Thanks 回答1: You should use an AlarmManager that sends pending intents. You can use multiple intents and broadcast recievers. In the broadcast recievers you can start a service. This way you can start multiple services at different times or

No handlers could be found for logger “stomp.py”

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问题 I'm trying to get Orbited running as per instructions on http://mischneider.net/?p=125 Here's a copy of the error: Validating models... 0 errors found Django version 1.3, using settings 'comet.settings' Development server is running at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. [28/May/2011 11:43:36] "GET /comet/ HTTP/1.1" 200 2952 [28/May/2011 11:43:36] "GET /site_media/Orbited.js HTTP/1.1" 304 0 [28/May/2011 11:43:37] "GET /site_media/stomp.js HTTP/1.1" 304 0 [28/May/2011 11:44

No handlers could be found for logger “stomp.py”

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How to create a IconHandler used by the shell in c++?

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问题 I tried to code an icon handler in c++ but i have some issues to do this. I followed the turoriel from codeproject The difference with this tutorial is i wanna code my dll with an ATL project from the wizard of visual studio (2013). So i create a new ATL project and i had a COM +1 class to this project (this the code of the header). The problem is it seams that my dll is attach but is detach right after. I'll put some code and more explication bellow : extern "C" BOOL WINAPI DllMain(HINSTANCE