Javalin framework and characteristics

Javalin is a simple, lightweight Java Web framework. It has a simple and elegant API that focuses on providing a simple way to build a web application. Introduction: Javalin is a Lightweight Web framework based on Java, which aims to provide minimized configuration and dependencies, so that developers can quickly build flexible web applications.It is an open source project, built on the popular Java Web servers such as JETTY, Undertow, and Netty, so it can be seamlessly integrated with these servers. Features: 1. Simple and easy to use: Javalin provides a simple and intuitive API, allowing developers to quickly build Web applications.It provides an intuitive routing and processing program mechanism that allows developers to easily define URL routes and process requests. 2. Minimalism: Javalin follows the principle of minimalism, without unnecessary complexity and redundant function.It focuses on providing core functions without introducing too much abstract level or complex configuration. 3. Scalability: Although Javalin is a lightweight framework, it provides strong flexibility and scalability.It supports the expansion function through the plug -in mechanism and can be seamlessly integrated with other Java libraries and frameworks. 4. Asynchronous support: Javalin supports asynchronous operations, allows processing non -blocking requests and responses.This allows it to process a large number of concurrent requests to improve the scalability and performance of the system. 5. Lightweight: The core library of Javalin is very small and no dependencies, so it can be easily integrated into the existing Java applications.It provides an independent jar file that can easily embed it into the application. Example code and configuration: Below is a simple Javalin example, showing how to define routing and processing requests: import io.javalin.Javalin; public class MyApp { public static void main(String[] args) { Javalin app = Javalin.create().start(7000); app.get("/", ctx -> ctx.result("Hello, Javalin!")); app.post("/users", ctx -> { String name = ctx.queryParam("name"); String email = ctx.queryParam("email"); // Treatment of user creation logic ctx.result("User created: " + name + ", " + email); }); } } In the above example, we created a Javalin application called "MyApp" and defined two routes.The first routing is that the GET request should answer the root path "/" and return "Hello, Javalin!".The second routing is the POST request for creating users, obtains the user's name and email address from the query parameter, and then returns a response containing user information. Use Javalin to add related dependencies in the project configuration file (eg, Pom.xml or Build.gradle), for example:: <dependencies> <dependency> <groupId>io.javalin</groupId> <artifactId>javalin</artifactId> <version>3.13.6</version> </dependency> </dependencies> In this way, you can use Javalin to build your own Java Web application.