Spring Boot简介

 

Emac

2016/7

Born for Microservice!

1 容器反转
2 简化配置
3 CoC

1 容器反转

1.1 容器切换

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jetty</artifactId>
</dependency>

1.2 启动应用

$java -jar demo-0.0.1-SNAPSHOT.jar

$mvn spring-boot:run

OR

1.3 MANIFEST.MF

Manifest-Version: 1.0
Implementation-Title: demo
Implementation-Version: 0.0.1-SNAPSHOT
Archiver-Version: Plexus Archiver
Built-By: emac
Start-Class: com.example.DemoApplication
Implementation-Vendor-Id: com.example
Spring-Boot-Version: 1.3.6.RELEASE
Created-By: Apache Maven 3.3.3
Build-Jdk: 1.8.0_60
Implementation-Vendor: Pivotal Software, Inc.
Main-Class: org.springframework.boot.loader.JarLauncher

2.1 多级配置

• 命令行参数
• 环境变量
• 外部配置文件
• 内嵌配置文件
• @PropertySource

2.2 Profile

• -Dspring.profiles.active=foo
•  

2 简化配置

@Autowired

private Environment env;

2.3 核心注解

• @SpringBootApplication
• @Configuration
• @Bean

2 简化配置

2.4 常用注解

注解扫描

• @ComponentScan
• @Import

条件加载

• @Profile
• @ConditionalOn***
• @Lazy

属性注入

• @Value("${foo}")
• @ConfigurationProperties

Pitfalls

3 Convention over Configuration

(Dependency-Driven-Configuration)

# DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true # JDBC url of the database.
spring.datasource.username=root
spring.datasource.password= # Login password of the database.

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

1. 添加依赖

2. 配置属性

Demo