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Shiro 1, introduction Apache Shiro is a Java Security (permission) framework. Shiro can easily develop good enough applications, which can be used not only in Java se environment, but also in Java EE environment. Shiro can complete authentication, authorization, encryption, session management, Web integration, caching, etc. Download address: ...

As important as code readability, strict awareness of exception handling is a developer's professional quality and basic skill. In the early era of J2EE technology, the tight coupling of front and back ends often results in the situation that the back end reports an error directly to the front end, that is, the page is a piece of abnormal code. ...

1 Overview As we said earlier Factory Mode and Abstract Factory Mode , let's talk about the builder model. The builder mode is also a very common creation mode. The two factory modes mentioned earlier hide the properties and construction details of a class, while the builder mode exposes the properties of a class appropriately through the Build ...

One of the most important functions of micro-services is the call between services, which depend on each other.For example, e-commerce systems have order services and inventory services.When we buy a product, we need to generate orders and reduce inventory.Here we're going to use inter-service Feign calls. Feign is a lightweight framework for H ...

1. Game introduction A jigsaw puzzle divides a picture into several pieces and randomly scrambles them. When all the pieces are put back to their original positions, the puzzle is finished (the end of the game). This character puzzle game is composed of three lines and three columns. The blocks are arranged in random order. The player clicks ar ...

1 Overview Last article Speaking of the factory method pattern, it provides a solution for creating class instances without specifying a specific implementation.So why do we need the abstract factory model? 2 Abstract Factory Mode The abstract factory model is essentially also a factory defined as an entry for class creation, which has the adva ...

In the previous article, we looked at what was done during the startup phase of a Dubbo service reference, and what was not seen during the remote invocation phase.The Dubbo service invocation process is complex and involves many steps, such as sending requests, codec, service demotion, filter chain processing, serialization, thread dispatch, ...

In the past, when writing multithreading and multiprocessing, because they usually complete their own tasks, each subthread or subprocess does not have much contact before. If I need to communicate, I will use queue or database to complete it. But recently, when I write some codes of multithreading and multiprocessing, I found that if they need ...

Start with a sample demo using the wait()/notify() method in general public class Test { public static void main(String[] args) { Object lock = new Object();// Lock object // target thread, which will be suspended Thread target = new Thread(() -> waited(lock)); target.start(); // action thread, use this thread to wa ...

PrefaceWrite an article a while ago Some understanding of the equation , whether it's a collaboration or callback, it essentially provides an asynchronous, non-blocking programming mode; it also introduces java support for asynchronous, non-blocking programming mode, mainly referring to Future and CompletableFuture; after that, some classmates ...