@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,\
  • 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：

　　启动器模块(就是一个Maven项目)：

<?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>ustc-anmin-starter</groupId>

    <artifactId>ustc-anmin-spring-boot-starter</artifactId>

    <version>1.0-SNAPSHOT</version>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <maven.compiler.source>10</maven.compiler.source>

        <maven.compiler.target>10</maven.compiler.target>

    </properties>

    <!--引入自动配置模块-->

    <dependencies>

        <dependency>

            <groupId>ustc.anmin.starter</groupId>

            <artifactId>anmin-spring-boot-starter-autoconfigure</artifactId>

            <version>0.0.1-SNAPSHOT</version>

        </dependency>

    </dependencies>

</project>

　　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>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.6.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>ustc.anmin.starter</groupId>

    <artifactId>anmin-spring-boot-starter-autoconfigure</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>anmin-spring-boot-starter-autoconfigure</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter</artifactId>

        </dependency>

    </dependencies>

</project>
package ustc.anmin.starter;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "ustc.anmin")

public class HelloServiceProperty {

    private String prefix;

    private String suffix;

    public String getSuffix() {

        return suffix;

    }

    public void setSuffix(String suffix) {

        this.suffix = suffix;

    }

    public String getPrefix() {

        return prefix;

    }

    public void setPrefix(String prefix) {

        this.prefix = prefix;

    }

}
package ustc.anmin.starter;

public class HelloService {

    HelloServiceProperty helloServiceProperty;

    public String sayHelloAnmin(String name){

        return helloServiceProperty.getPrefix() + name + helloServiceProperty.getSuffix();

    }

    public HelloServiceProperty getHelloServiceProperty() {

        return helloServiceProperty;

    }

    public void setHelloServiceProperty(HelloServiceProperty helloServiceProperty) {

        this.helloServiceProperty = helloServiceProperty;

    }

}
package ustc.anmin.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

@EnableConfigurationProperties(HelloServiceProperty.class)  //将配置类加入容器

public class HelloServiceAutoConfiguration {

    @Autowired

    HelloServiceProperty helloServiceProperty;

    @Bean

    public HelloService helloService(){

        HelloService service = new HelloService();

        service.setHelloServiceProperty(helloServiceProperty);

        return new HelloService();

    }

}

spring.factories文件

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\

  ustc.anmin.starter.HelloServiceAutoConfiguration

test controller

<?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>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.6.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>ustc.anmin</groupId>

    <artifactId>starter-test</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>starter-test</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>ustc.anmin.starter</groupId>

            <artifactId>ustc-anmin-spring-boot-starter</artifactId>

            <version>1.0-SNAPSHOT</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>
package ustc.anmin.starter.controller;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

import ustc.anmin.starter.HelloService;

@RestController

public class HelloController {

    @Autowired

    HelloService service;

    @GetMapping("/hello")

    public String hello(){

        return service.sayHelloAnmin("---anmin---");

    }

}

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