Microservice Spring Boot Complete Knowledge System Tutorial

1. Microservice Spring Boot

(1) Basic knowledge

1. Advantages:

1. Simplify Spring application building and development process
2. Remove a lot of XML configuration files
3. Simplify complex dependency management

2. Technical basis:

Java 基础、Servlet、JDBC、Maven、Spring、Spring MVC、MyBatis 

3. Features:

1. Standalone Spring project

以 jar 包形式独立运行
项目只需通过命令“ java–jar xx.jar” 即可运行

2. Embedded Servlet Container

使用嵌入式 Servlet 容器（Tomcat、Jetty 、 Undertow）
应用无需打成 WAR 包 

3. Provide starter to simplify Maven configuration

提供一系列“starter”项目对象模型（POMS）来简化 Maven 配置

4. Provides a lot of automatic configuration

提供大量默认自动配置、简化项目开发
开发人员也通过配置文件修改默认配置

5. Self-contained application monitoring

可对正在运行项目提供监控

6. No code generation and xml configuration

不需要任何 xml 配置即可实现 Spring 的所有配置

(2) Environment Construction

1. Development platform: IntelliJ IDEA

2. Version selection: stable

	Spring Boot		2.x
	JDK				8.0 及以上版本
	Maven			3.x
	IntelliJ IDEA	14.0 以上

3. Create a Spring Boot project

1. Create with Maven: Find the tutorial yourself (omitted)

1. Dependency file: pom.xml

  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

2. Main program: helloWorldApplication.java—— @SpringBootApplication

package net.biancheng.www;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class helloWorldApplication {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(helloWorldApplication.class, args);
    }
}

2. Create with Spring Initializr

Spring 项目创建向导（Spring Initializr ）

1 Method 1: Projects → New Project

2 Method 2: File → New → Project → Spring Initializr

问题：https://start.spring.io——去掉https的s

1. Web → Spring Web Starter
2. Template → Thymeleaf
3. SQL → Spring Data JPA → Mysql Driver

Second, third-party library configuration: zero configuration, automatic configuration,

开箱即用（out-of-the-box）