Programmer Think

Interceptor 1.1. concept Interceptors in Java are objects that dynamically intercept action calls. It provides a mechanism that allows developers to define the code to be executed before and after the execution of an action, or prevent the execution of an action before it is executed. At the same time, it also provides a way to extract the r ...

1. Spring MVC common components Dispatcher servlet: front-end controller, which does not need to be developed by engineers and is provided by the framework Function: handle the request and response in a unified way. It is the center of the whole process control, which calls other components to handle the user's request Handler mapping: pro ...

Members of the HandlerMapping family can be divided into two branches. One is inherited from AbastractUrlHandlerMapping, the other is inherited from AbastracHandlerMethodMapping, and both are inherited from AbastractHandlerMapping. The green box AbstractHandlerMapping abstract class implements the skeleton logic of [obtain the processors and ...

1,Servlet + MVC 1. Functions of Servlet: 1. Servlet receives the user request and calls the corresponding business method 2. After the business processing is completed, the returned result is passed to Serlvet 3. The Servlet turns to the JSP according to the returned information, and the JSP renders the page 5. Give the newly rende ...

review Implementation steps of developing spring MVC with annotations: Create a new web projectImport related jar packagesWrite web XML, register DispatcherServletWrite spring MVC configuration fileThe next step is to create the corresponding control class, controllerFinally, improve the correspondence between the front-end view and the contr ...

Developing spring MVC with annotations Statement: This article is a study note, written according to spring MVC of madness theory SpringMVC 4.2.4.RELEASE Chinese document I. Development with annotations 1. We conduct POM Dependency injection of XML: <build> <resources> <resource> ...

We often encounter such scenarios as dynamic permission adjustment. For example, Zhang San is a department head and does not have the permission to delete employee data, but his superiors trust Zhang San and want to entrust this function to Zhang San. Let's first log in with Zhang San (xsc001): Let's look at Zhang San's role permissions prin ...

@ControllerAdvice handling exception spring boot uses @ ControllerAdvice to handle exceptions thrown in the Controller. In Spring 3.2, @ ControllerAdvice, @ RestControllerAdvice annotations are added, which can be used to define @ ExceptionHandler, @ InitBinder, @ ModelAttribute, and applied to all @ RequestMapping, @ PostMapping, @ GetMapping ...

Spring MVC workflow from the perspective of source code 1.1 build a source code debugging environment for gradle 1) Build gradle environment 4 steps 1,File-New-Module Select java and web 2. Fill in package information 3. Storage path 2) Increase start dependence The dependent items can be directly copied and pasted 1. Dependence on s ...

Spring MVC exception handling In the development of Spring MVC application, whether operating the underlying database, business layer or control layer, we will inevitably encounter all kinds of predictable and unpredictable exceptions. We need to catch and handle exceptions to ensure that the program is not terminated. Spring MVC has the follow ...