springboot自定义starter

starter：
1、这个场景需要使用到的依赖是什么？
2、如何编写自动配置

@Configuration //指定这个类是一个配置类
@ConditionalOnXXX //在指定条件成立的情况下自动配置类生效
@AutoConfigureAfter //指定自动配置类的顺序
@Bean //给容器中添加组件
@ConfigurationPropertie结合相关xxxProperties类来绑定相关的配置
@EnableConfigurationProperties //让xxxProperties生效加入到容器中
自动配置类要能加载
将需要启动就加载的自动配置类，配置在META‐INF/spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\

3、模式：
启动器只用来做依赖导入；
专门来写一个自动配置模块；
启动器依赖自动配置；别人只需要引入启动器（starter）
mybatis-spring-boot-starter；自定义启动器名-spring-boot-starter

步骤：
1）、启动器模块

<?xml version="1.0" encoding="UTF‐8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema‐instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven‐4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.atguigu.starter</groupId>
	<artifactId>atguigu‐spring‐boot‐starter</artifactId>
	<version>1.0‐SNAPSHOT</version>
	<!‐‐启动器‐‐>
	<dependencies>
	<!‐‐引入自动配置模块‐‐>
		<dependency>
			<groupId>com.atguigu.starter</groupId>
			<artifactId>atguigu‐spring‐boot‐starter‐autoconfigurer</artifactId>
			<version>0.0.1‐SNAPSHOT</version>
		</dependency>
	</dependencies>
</project>

2）、自动配置模块

<?xml version="1.0" encoding="UTF‐8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema‐instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven‐
4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.atguigu.starter</groupId>
	<artifactId>atguigu‐spring‐boot‐starter‐autoconfigurer</artifactId>
	<version>0.0.1‐SNAPSHOT</version>
	<packaging>jar</packaging>
	
	<name>atguigu‐spring‐boot‐starter‐autoconfigurer</name>
	<description>Demo project for Spring Boot</description>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring‐boot‐starter‐parent</artifactId>
		<version>1.5.10.RELEASE</version>
		<relativePath/> <!‐‐ lookup parent from repository ‐‐>
	</parent>
	
	<properties>
		<project.build.sourceEncoding>UTF‐8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF‐8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>
	
	<dependencies>
		<!‐‐引入spring‐boot‐starter；所有starter的基本配置‐‐>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring‐boot‐starter</artifactId>
		</dependency>
	</dependencies>
</project>

package com.atguigu.starter;
import org.springframework.boot.context.properties.ConfigurationProperties;
@ConfigurationProperties(prefix = "atguigu.hello")
public class HelloProperties {
	private String prefix;
	private String suffix;
	public String getPrefix() {
		return prefix;
	}
	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}
	public String getSuffix() {
		return suffix;
	}
	public void setSuffix(String suffix) {
		this.suffix = suffix;
	}
}

package com.atguigu.starter;
public class HelloService {
	HelloProperties helloProperties;
	public HelloProperties getHelloProperties() {
		return helloProperties;
	}
	public void setHelloProperties(HelloProperties helloProperties) {
		this.helloProperties = helloProperties;
	}
	public String sayHellAtguigu(String name){
		return helloProperties.getPrefix()+"‐" +name + helloProperties.getSuffix();
	}
}

package com.atguigu.starter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@ConditionalOnWebApplication //web应用才生效
@EnableConfigurationProperties(HelloProperties.class)
	public class HelloServiceAutoConfiguration {
	@Autowired
	HelloProperties helloProperties;
	@Bean
	public HelloService helloService(){
	HelloService service = new HelloService();
	service.setHelloProperties(helloProperties);
		return service;
	}
}

更多SpringBoot整合示例
https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples

来源：oschina

链接：https://my.oschina.net/u/4257044/blog/4717686