interceptor | 易学教程

DispatcherServlet-接收请求流程.md

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 上一篇： SpringMVC源码分析-DispatcherServlet-init方法分析 DispatcherServlet的init已经将所需要的各种Resolver准备好，可以说是万事俱备只欠东风了，下面就看看它是如何接收请求，并将请求映射到Controller上的方法，然后将返回值格式化为字符串或者使用视图解析器完成解析的时序图概要说明前半部分画了从Tomcat最后一个阀门（Valve）如何一步步调用到DispatcherServlet的doService方法。后半部分画了SpringMVC的处理流程，如下：在DispatcherServlet中调用getHandler()得到符合条件的HandlerMapping（如：RequestMappingRequestHandler-请求参数解析、绑定。。。在这里面还会降将该请求适合的Interceptors与handler一起封装为一个HandlerExecutionChain），接着根据得到的HandlerMapping调用getHandlerAdpater()得到符合条件的HandlerAdapter（如：RequestMappingHandlerAdapter-调用Controller中的方法，返回值格式化，确定ModleAndView）

CDI call interceptor annotated method within same instance

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问题 here is my DAO implementation, i will load the whole table and cached in memory for a certain period of time @ApplicationScoped public class DataAccessFacade { @Inject private EntityManager em; @CacheOutput public Map<String, String> loadAllTranslation() { List<Translation> list = em.createQuery("select t from Translation t").getResultList(); Map<String, String> result = new HashMap<String, String>(); // do more processing here, omitted for clarity return result; } public String

Getting DbContext from implementation of IDbCommandInterceptor

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问题 I am using an IDbCommandInterceptor implementation: public class MyInterceptor : IDbCommandInterceptor { public void ReaderExecuting(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext) { var context = interceptionContext.DbContexts.FirstOrDefault(); } public void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext) { } public void ScalarExecuting(DbCommand command, DbCommandInterceptionContext<object> interceptionContext) {

Rails mail interceptor only for a specific mailer

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问题 I have an interceptor : DevelopmentMailInterceptor and an inititializer setup_mail.rb that initiates the interceptor. But I want to apply it to a specific mailer (to intercept NotificationMailer and not the other ones. So I set in setup_mail.rb : `NotificationMailer.register_interceptor(DevelopmentMailInterceptor) But then all mailers get intercepted, as if I'd written ActionMailer::Base.register_interceptor(DevelopmentMailInterceptor) How can I filter this? 回答1: I found the solution by

axios interceptors response undefined

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问题 I'm trying to logout my user once they get a 401. I'm using axios to return data from the api I was looking around and found the same axios.interceptors.response axios.interceptors.response.use( response => response, error => { const {status} = error.response; if (status === 401 ) { store.dispatch('snackBar', snackbarObj) } return Promise.reject(error); } ) It appears my error.response is undefined. I'm not sure what is wrong? any ideas? 回答1: You're not getting a response from the request you

Spring Boot 2.0.0 M6 - Add Hibernate Interceptor

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问题 After upgrade from Spring Boot 2.0.0 M2 to 2.0.0 M6 my Hibernate interceptor implementation don't work anymore. My old implementation: @Configuration public class HibernateConfiguration extends HibernateJpaAutoConfiguration { private HibernateStatisticsInterceptor hibernateStatisticsInterceptor; public HibernateConfiguration(DataSource dataSource, JpaProperties jpaProperties, ObjectProvider<JtaTransactionManager> jtaTransactionManager, ObjectProvider<TransactionManagerCustomizers>

2020年我要这样写代码

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 在 9102 年年初，一位室友问我一个问题，如何才能够提升写代码的能力? 可惜的是: 当时仅仅回复了一些自己的想法，如多看开源代码，多读书，多学习，多关注业界的动向与实践，同时也列了一些原则。但是这些并没有所总结，又或者说没有例子的语言始终是空泛的。所以在今年年底之际，对应着今年中遇到的形形色色的代码问题来一一讲解一下。好代码的用处实际上本书建立在一个相当不可靠的前提之上：好的代码是有意义的。我见过太多丑陋的代码给他们的主人赚着大把钞票，所以在我看来，软件要取得商业成功或者广泛使用，“好的代码质量”既不必要也不充分。即使如此，我仍然相信，尽管代码质量不能保证美好的未来，他仍然有其意义：有了质量良好的代码以后，业务需求能够被充满信心的开发和交付，软件用户能够及时调整方向以便应对机遇和竞争，开发团队能够再挑战和挫折面前保持高昂的斗志。总而言之，比起质量低劣，错误重重的代码，好的代码更有可能帮助用户取得业务上的成功。以上文字摘抄于《实现模式》的前言，距离本书翻译已经时隔 10 年了，但是这本书仍旧有着很大的价值。同时对于上述言论，我并不持否认意见。但是我认为，坏代码比好代码更加的费财(嗯，没打错，我确定)。对于相同的业务需求，坏代码需要投入的精力，时间更多，产出反而会更少。同时根据破窗理论(

Axios interceptor in vue 2 JS using vuex

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问题 I store token after success login call in vuex store like this: axios.post('/api/auth/doLogin.php', params, axiosConfig) .then(res => { console.log(res.data); // token this.$store.commit('login', res.data); }) axiosConfig is file where I only set baseURL export default { baseURL: 'http://localhost/obiezaca/v2' } and params is just data sent to backend. My vuex file looks is: import Vue from 'vue'; import Vuex from 'vuex'; Vue.use(Vuex); export const store = new Vuex.Store({ state: { logged:

Struts 2 (version 2.3.28) only accepts registered locales

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问题 In Struts 2 version 2.3.28, the i18n interceptor only accepts the locales which are registered to jvm, the list which is returned by Locale.getAvailableLocales() . Well, although I can extend the list of available Java Locales, as mentioned How to extend the list of available Java Locales, is it any short way that set this interceptor to accept all strings as locale (for example fa_IR ) ?! Just a note: Setting the default locale to fa_IR ( <constant name="struts.locale" value="fa_IR" /> )

Interceptor method not called with interceptor binding

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问题 I'm using Java EE 6 & Jboss AS7.1 and try to use interceptor binding (Example from jboss site). I have an InterceptorBinding annotation: @InterceptorBinding @Target({ ElementType.METHOD, ElementType.TYPE }) @Retention(RetentionPolicy.RUNTIME) public @interface GeoRestrictedEquipment { } The interceptor: @GeoRestrictedEquipment @Interceptor public class GeoRestrictedEquipmentInterceptor { @EJB EquipmentDao equipmenttDao; @EJB SecurityService securityService; @AroundInvoke public Object checker