Introduction to Java Basics to Practical Applications: Microservice Practical Architecture

Microservices architecture allows applications to be decomposed into loosely coupled components, improving flexibility, scalability, and maintainability. This tutorial provides a complete guide to using Java from basics to practical application of microservice architecture, including steps: Create a Java project Add dependencies Configure Spring Boot to implement Eureka Enable Ribbon on the client Use service discovery API Practical case: Create a microblog integration service to run the application Program

Java Basics to Practical Application: Microservice Practical Architecture

Introduction

Microservice architecture is a method of decomposing an application into independent, highly maintainable, loosely coupled components. It provides high flexibility, scalability and maintainability. This tutorial will guide you in practicing microservice architecture using Java, from basic concepts to actual practical cases.

Getting Started

• Create a Java Project: Create a new Java project using an IDE such as IntelliJ IDEA.
• Add dependencies: Add Maven dependencies for Spring Boot, Spring Cloud, Eureka and Ribbon.
• Configure Spring Boot: Use the application.properties file to configure Spring Boot settings, such as port number and Eureka registration address.

Eureka Client

• Implement Eureka client: Create a class that inherits EurekaClient, And override the serviceUrl() method to register the service.
• Service logout: Use the unregister() method of EurekaClient to log out when the service is shut down.

Load Balancing

• Enable Ribbon: Enable Ribbon in the application.yml file.
• Set load balancing strategy: Use @LoadBalanced annotation and policies such as RoundRobinRule or RandomRule to configure load balancing.

Service Discovery

• Use the Service Discovery API: Use the DiscoveryClient API provided by Spring Cloud Discover other services.
• Get instances by service name: Use the getInstances() method of DiscoveryClient to get the instance list of a specific service name.

Practical case: microblog

Create service:

• Create two independent microblogs Services, posts-service and users-service.
• In posts-service, store blog posts and their metadata.
• In users-service, store user information and their article list.

Implement API endpoints:

• In posts-service, provide endpoints to create, get, update, and delete article.
• In users-service, provide endpoints to create, get, update, and delete users.

Integrate services:

• Integrate services together using Eureka clients and load balancers.
• In posts-service, use DiscoveryClient to discover users-service and get the user list.
• In users-service, use Ribbon load balancing to call posts-service to get the article list.

Run the application:

• Start different service instances as Eureka server, posts-service and users-service.
• Test the application, create articles and users, and verify that articles associated with the user are being displayed correctly.

conclusion：

This tutorial demonstrates how to use Java to practice microservice architecture, from basic components to the complete development process of practical cases. By understanding the fundamentals and practical use cases of microservices, you can build modern applications that are highly scalable, maintainable, and scalable.

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