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Struts2 interceptors are a core mechanism for implementing cross-cutting concerns in web applications, leveraging aspect-oriented programming principles. Similar in concept to servlet filters, interceptors execute logic before and after an action method is invoked. However, unlike filters that operate at the servlet container level, Struts2 int ...

Componant Implementation DataSource Annotation DataSource.java AspectJ Implementation DataSourceAspect.java Data Source Constants DataSourceConstants.java Dynamic Data Source DynamicDataSource.java Configuration DataSourceConfig.java DataSource Annotation package com.example.datasource.config; import java.lang.annotation.*; ...

The automatic filling of common fields primarily uses AOP (Aspect-Oriented Programming), involving reflection mechanisms and custom annotations. For adding new dishes, we learn about file upload techniques using Alibaba Cloud OSS for cloud storage, along with handling relationships between two tables—retrieving dish IDs from the dish_flavor tab ...

Custom Annotation for Logging Define an annotation to mark methods requiring logging: @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface AuditLog { String category() default ""; String action() default ""; } Log Entity Structure Create a data model for log records: @Data public class S ...

1. Custom Annotation for Auto-Fill Define a custom annotation to mark methods that require automatic field populatoin. import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) p ...

Fundamentals of Aspect-Oriented Programming Core Concepts AOP (Aspect Oriented Programming) is a programming paradigm focused on modularizing cross-cutting concerns. While OOP structures code around classes and objects, AOP concentrates on separating common functionalities—such as logging, security, or transaction management—from the core busin ...

Introduction to AOP For developers familiar with Android or Java Web development, the concept of Aspect-Oriented Programming (AOP) is well-established. The core of AOP lies in identifying an aspect and then performing pre-processing or post-processing on a specific business operation, or even replacing the operation entirely. The granularity of ...

Configuring AOP Using XML in Spring Spring supports aspect-oriented programming through both annotations and XML-based configuration. While annotation-driven AOP is more common in modern applications, XML configuration remains a viable and explicit alternative—especially in legacy or highly controlled enviroments. 1. Defining the Aspect Class T ...

IOC Section 1. Spring Ecosystem Overview Spring is a comprehensive ecosystem providing essential infrastructure for Java application development. The Spring ecosystem typically consists of: Spring Framework - the core framework Spring Boot - adds auto-configuration capability, which reads Spring Boot Starter configuration during startup, initi ...

DataSource Context Holder Implementation Based on Deque public class DataSourceContextManager { // Using ThreadLocal<Deque> to support nested data sources private static final ThreadLocal<Deque<DataSourceEnum>> CONTEXT_HOLDER = ThreadLocal.withInitial(ArrayDeque::new); /** * Push data source type ...