Takes an opinionated view of building production-ready Spring applications. 
Spring Boot favors convention over configuration and is designed to get you up and running as quickly as possible.

###Features

• Create stand-alone Spring applications：创建独立的spring应用

• Embed Tomcat, Jetty or Undertow directly (no need to deploy WAR files)：嵌入Tomcat, Jetty Undertow 而且不需要用war的方式部署他们

• Provide opinionated 'starter' POMs to simplify your Maven configuration：提供的“starters”poms来简化Maven配置

• Automatically configure Spring whenever possible：尽可能自动配置spring应用

• Provide production-ready features such as metrics, health checks and externalized configuration：提供生产指标,健壮检查和外部化配置

• Absolutely no code generation and no requirement for XML configuration：绝对没有代码生成和XML配置要求

    快速、门槛低、Java config
  

###缺点：

• 文档较少
• 出错不容易排查
• 入门容易、深入难

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

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

• 提供RESTful接口
• 发布静态资源(/resources/static)

    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.1.1</version>
        <exclusions>
            <exclusion>
                <groupId>org.apache.tomcat</groupId>
                <artifactId>tomcat-jdbc</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.21</version>
    </dependency>
    <!--  ============= 光  连接池  ================ -->
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP-java7</artifactId>
        <version>2.4.9</version>
    </dependency>

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

springboot 默认采用tomcat-jdbc连接池，应用排除了默认连接池，采用“光”连接池

================================================================

到此一个 mvc + mysql的服务已可以发布，能够完成大部分的web开发工作

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Spring Boot提供了默认配置的模板引擎主要有以下几种：

• Thymeleaf

• FreeMarker

• Velocity

• Groovy

• Mustache

  org.springframework.boot spring-boot-starter-thymeleaf

\resources\templates目录下创建模板文件

###RESTful文档自动生成——swagger2

    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>${version.swagger2}</version>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>${version.swagger2}</version>
    </dependency>

• swagger配置类

  @Configuration @EnableSwagger2 public class Swagger { @Bean public Docket createRestApi() { return new Docket(DocumentationType.SWAGGER_2) .apiInfo(apiInfo()) .select() .apis(RequestHandlerSelectors.basePackage("com.yd.web.controller")) .paths(PathSelectors.any()) .build(); }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("比价工具接口")
                .description("App版比价工具接口")
                .termsOfServiceUrl("")
                .contact("易到-大数据技术组")
                .version("1.0")
                .build();
    }
  

  }

• 访问 http://localhost:8080/swagger-ui.htm

================================================================

前后端分离后的契约

================================================================

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>   

####主要暴露的功能

• GET /autoconfig 查看自动配置的使用情况 true
• GET /configprops 查看配置属性，包括默认配置 true
• GET /beans 查看bean及其关系列表 true
• GET /dump 打印线程栈 true
• GET /env 查看所有环境变量 true
• GET /env/{name} 查看具体变量值 true
• GET /health 查看应用健康指标 false
• GET /info 查看应用信息 false
• GET /mappings 查看所有url映射 true
• GET /metrics 查看应用基本指标 true
• GET /metrics/{name} 查看具体指标 true
• POST /shutdown 关闭应用 true
• GET /trace 查看基本追踪信息 true

###Spring Boot 其他内容

• 定时任务Scheduled
• 异步Async
• AOP
• 缓存支持EnCache Redis
• 返回结果统一处理（Advice）
• 指标监控

http://docs.spring.io/spring-boot/docs/2.0.0.BUILD-SNAPSHOT/reference/htmlsingle/

###Application properties http://docs.spring.io/spring-boot/docs/2.0.0.BUILD-SNAPSHOT/reference/htmlsingle/#appendix