interceptor

Spring MVC 3: Interceptor return view on false

由 有些话、适合烂在心里 提交于 2019-12-08 01:56:50
问题 I'm using an interceptor to restrict access to certain users in the app. For instance: @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Logger.logRequest(request); return list.contains(user); } If the list contains the user, it completes the request. Otherwise, it does nothing. How do I display a custom page if the user doesn't have access? Right now, if it's false, it just shows a blank page which is not great for

How can Interceptor in python be applied

由 删除回忆录丶 提交于 2019-12-08 01:01:22
问题 I need to know when a function is called and do something after calling the function. It seems Interceptor can do it. How can I use Interceptor in python ? 回答1: This can be done using decorators: from functools import wraps def iterceptor(func): print('this is executed at function definition time (def my_func)') @wraps(func) def wrapper(*args, **kwargs): print('this is executed before function call') result = func(*args, **kwargs) print('this is executed after function call') return result

Mybatis之插件分析

由 大城市里の小女人 提交于 2019-12-07 13:54:29
前言 Mybatis提供了强大的扩展功能，也就是Mybatis的插件（plugins）功能；MyBatis允许你在已映射语句执行过程中的某一点进行拦截调用，拦截之后可以对已有方法添加一些定制化的功能，比如常见的分页功能；试图修改或重写已有方法的行为的时候，你很可能在破坏MyBatis 的核心模块，这些都是更低层的类和方法，所以使用插件的时候要特别当心。 如何扩展 1.拦截点 拦截的点一共包含四个对象，若干方法，具体如下： Executor (update, query, flushStatements, commit, rollback, getTransaction, close, isClosed) ParameterHandler (getParameterObject, setParameters) ResultSetHandler (handleResultSets, handleOutputParameters) StatementHandler (prepare, parameterize, batch, update, query) 有了拦截点之后，我们需要告诉Mybatis在哪个类下执行到哪个方法的时候进行扩展；Mybatis提供了简单的配置即可实现； 2.如何扩展 使用插件是非常简单的，只需实现Interceptor接口，并指定想要拦截的方法签名即可

使用CXF Interceptor特性

由 假装没事ソ 提交于 2019-12-07 13:28:36
在Web Service中，客户端和服务端通过交换信息来互相通信。信息在客户端组装，在服务端解组。在Web Service术语中，组装表示将JAVA对象转换为XML文件，这些XML文档将被传输到网络中；反而言之，解组就是将XML文档转换为JAVA对象。 当客户端向服务端发送请求，请求中的数据将被组装并传输到服务器。服务器获取该数据，解组，最后调用服务方法。当服务器发送响应给客户端时，将重复该过程。组装和解组是客户端和服务端提供的核心功能。CXF通过Interceptor来提供这些功能。 Interceptor通过监听传输过来的信息来提供核心功能。这些功能包括：组装、解组、操纵消息头、执行认证检查、验证消息数据等。CXF提供内置的Interceptor来实现这些功能。用户也可以自定义Interceptor。Interceptor以phases组织起来，以链的形式调用， 理解interceptor phase 和chain Phase可以被当作分类框，将类似功能的Interceptor组织起来。 有两种Interceptor链，inbound链和outbound链。两种都有一系列的Phase。例如，在inbound链中有UNMARSHAL Phase，用来解组信息数据，并将其转化为JAVA对象。 对于每个请求来讲，在服务端创建inbound Interceptor；对于每个响应来讲

Angular 5 Interceptor - Only call second interceptor after failed retry on first interceptor

由 别来无恙 提交于 2019-12-07 10:05:26
问题 I am building an angular 5 app where I have 2 interceptors: One to retry failed 504 requests Another to show error messages to users about failed requests I want that the second interceptor only gets called when the error is not 504 or when it is 504 and has already been retried by the first interceptor. I have created a sample with both interceptors: https://stackblitz.com/edit/angular-interceptors-ckbvsb Hope to get some assistance! Thanks UPDATE: Thanks everyone for your assistance! I have

Java CDI. Interceptor is only invoked in the first method call in a class [duplicate]

由 我们两清 提交于 2019-12-07 06:20:15
问题 This question already has an answer here : Why is the interceptor not called in the same service class? (1 answer) Closed 3 years ago . I'm using CDI Interceptors and I've realized that only the first method call in a class annotated with @Interceptor is intercepted. In the example below methodB is never intercepted. @InterceptorBinding @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) public @interface Transactional { } @Transactional @Interceptor public class

Struts 2 interceptor that runs after the page executes?

由 喜欢而已 提交于 2019-12-07 05:43:49
问题 I'm using Struts 2. Using an interceptor, I create a database connection at the start of each page execution. So for example, if a user goes to "myAction.do", it will create the database connection and then call myAction.do method. What I'm looking for now is an interceptor or any other way to automatically call a method after the page execution, which will close the database connection. Is that possible? 回答1: In interceptor you can write pre processing and post processing logics. Pre

How can I intercept execution of all the methods in a Java application using Groovy?

由 拟墨画扇 提交于 2019-12-07 04:58:53
问题 Is it possible to intercept all the methods called in a application? I'd like to do something with them, and then let them execute. I tried to override this behaviour in Object.metaClass.invokeMethod , but it doesn't seem to work. Is this doable? 回答1: Have you looked at Groovy AOP? There's very little documentation, but it allows you to define pointcuts and advice in a conceptually similar way as for AspectJ. Have a look at the unit tests for some more examples The example below will match

Make a synchronous Retrofit call from inside an OkHttp Interceptor

由 江枫思渺然 提交于 2019-12-07 04:34:27
问题 I am trying to automatically refresh an auth token if it is expired. I am using the new Interceptor class that was introduced in OkHttp 2.2 . In the intercept method I am trying the original request with chain.proceed(request) , checking the response code, and if the token is expired I am making a call to a separate Retrofit service, synchronously, to obtain a new token. The strange thing is, no code past the synchronous call seems to run. If I try debugging with a breakpoint on the

Exclude Spring Request HandlerInterceptor by Path-Pattern

由 筅森魡賤 提交于 2019-12-07 03:27:18
问题 I know we can map different url to different interceptor, or we can map multiple url to single interceptor too. I am just curious to know if we also have exclude option. for example if I have 50 url mapping in application and except 1 mapping I want to call interceptor for all so rather than writing configuration for 49 mapping can I just mention * and one exclude to the 50th url? 回答1: HandlerInterceptor s can be applied or excluded to (multiple) specific url's or url-patterns. See the MVC
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