SpringBoot2核心技术-基础入门
一、环境要求
Java8及以上
Maven 3.3及以上

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
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
三、时代背景
3.1、微服务
James Lewis and Martin Fowler (2014) 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)
微服务是一种架构风格
一个应用拆分为一组小型服务
每个服务运行在自己的进程内,也就是可独立部署和升级
服务之间使用轻量级HTTP交互
服务围绕业务功能拆分
可以由全自动部署机制独立部署
去中心化,服务自治。服务可以使用不同的语言、不同的存储技术
3.2、分布式
分布式的困难
远程调用
服务发现
负载均衡
服务容错
配置管理
服务监控
链路追踪
日志管理
任务调度
…
分布式的解决
SpringBoot + SpringCloud
四、 SpringBoot2入门
4.1系统要求
Java 8 & 兼容java14 .
Maven 3.3+
idea 2019.1.2
4.2maven设置
在maven的这个目录下的setting文件中添加如下内容
<mirrors>
<mirror>
<id>nexus-aliyun</id>
<mirrorOf>central</mirrorOf>
<name>Nexus aliyun</name>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
</mirror>
</mirrors>
<profiles>
<profile>
<id>jdk-1.8</id>
<activation>
<activeByDefault>true</activeByDefault>
<jdk>1.8</jdk>
</activation>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
</properties>
</profile>
</profiles>
4.3HelloWorld
需求:浏览发送/hello请求,响应 Hello,Spring Boot 2
4.3.1创建maven工程
4.3.2引入依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>