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 (opens new window)

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

Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can "just run".

能快速创建出生产级别的Spring应用

# 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/ (opens new window)

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)