Spring与SpringBoot

一、Spring与SpringBoot

1、Spring能做什么

1.1、Spring的能力

1.2、Spring的生态

https://spring.io/projects/spring-boot

覆盖了：web开发、数据访问、安全控制、分布式、消息服务、移动开发、批处理......

1.3、Spring5重大升级

1.3.1、响应式编程

1.3.2、内部源码设计

基于Java8的一些新特性，如：接口默认实现。重新设计源码架构。

2、为什么用SpringBoot

2.1、SpringBoot优点

Create stand-alone Spring applications
- 创建独立Spring应用
Embed Tomcat, Jetty or Undertow directly (no need to deploy WAR files)
- 内嵌web服务器
Provide opinionated 'starter' dependencies to simplify your build configuration
- 自动starter依赖，简化构建配置
Automatically configure Spring and 3rd party libraries whenever possible
- 自动配置Spring以及第三方功能
Provide production-ready features such as metrics, health checks, and externalized configuration
- 提供生产级别的监控、健康检查及外部化配置
Absolutely no code generation and no requirement for XML configuration
- 无代码生成、无需编写XML

SpringBoot是整合Spring技术栈的一站式框架

SpringBoot是简化Spring技术栈的快速开发脚手架

2.2、SpringBoot缺点

人称版本帝，迭代快，需要时刻关注变化
封装太深，内部原理复杂，不容易精通

3、时代背景

3.1、微服务

James Lewis and Martin Fowler (2014) (opens new window) 提出微服务完整概念。https://martinfowler.com/microservices/

In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.-- James Lewis and Martin Fowler (2014) (opens new window)