大家好，我是小悟
Spring Boot官网各类启动器：
https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-build-systems.html#using-boot-starter
Spring Boot将所有的功能场景都抽取出来，做成一个个starter，只需要在项目里面引入这些starter，相关的依赖包都会导入进来，可以说是十分的方便了。在日常的开发中，我们也可以结合业务自定义需要的starter，供其他开发小伙伴调用。
1、创建一个新的空工程
2、创建两个module，austin-spring-boot-starter启动器是普通的maven工程，austin-spring-boot-starter-autoconfigurer自动配置模块是普通的springboot工程
austin-spring-boot-starter的pom文件
<?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.austin.starter</groupId>
<artifactId>austin-spring-boot-starter</artifactId>
<version>1.0-SNAPSHOT</version>
<!--启动器-->
<dependencies>
<!--引入自动配置模块-->
<dependency>
<groupId>com.austin.starter</groupId>
<artifactId>austin-spring-boot-starter-autoconfigurer</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
austin-spring-boot-starter-autoconfigurer的pom文件
<?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>com.austin.starter</groupId>
<artifactId>austin-spring-boot-starter-autoconfigurer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>austin-spring-boot-starter-autoconfigurer</name>
<description>Demo project for Spring Boot</description>
<properties>
<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>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
</project>
3、在austin-spring-boot-starter的pom文件中引入自动配置模块，如下所示
<?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.austin.starter</groupId>
<artifactId>austin-spring-boot-starter</artifactId>
<version>1.0-SNAPSHOT</version>
<!--启动器-->
<dependencies>
<!--引入自动配置模块-->
<dependency>
<groupId>com.austin.starter</groupId>
<artifactId>austin-spring-boot-starter-autoconfigurer</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
4、在austin-spring-boot-starter-autoconfigurer下新建HelloProperties、HelloService、HelloServiceAutoConfiguration
package com.austin.starter;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
/**
* @ClassName HelloProperties
* @Description
*/
@ConfigurationProperties(prefix = "austin.hello")
@Data
public class HelloProperties {
private String prefix;
private String suffix;
}
package com.austin.starter;
import lombok.Data;
/**
* @ClassName HelloService
* @Description
*/
@Data
public class HelloService {
HelloProperties helloProperties;
public String sayHello(String name){
return helloProperties.getPrefix() + "-" + name + "-" + helloProperties.getSuffix();
}
}
package com.austin.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;
/**
* @ClassName HelloServiceAutoConfiguration
* @Description
*/
@Configuration
@ConditionalOnWebApplication//web应用才生效
@EnableConfigurationProperties(HelloProperties.class)//让配置属性文件生效
public class HelloServiceAutoConfiguration {
@Autowired
HelloProperties helloProperties;
@Bean
public HelloService helloService(){
HelloService service = new HelloService();
service.setHelloProperties(helloProperties);
return service;
}
}
5、resources下面新建META-INF-spring.factories文件
内容如下
# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.austin.starter.HelloServiceAutoConfiguration
因为starter是依赖autoconfigurer的，所以先把autoconfigurer安装到本地仓库，再安装starter
6、另外新建一个springboot工程来测试我们自定义的starter
7、新建一个controller来测试
package com.austin.custom.controller;
import com.austin.starter.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @ClassName HelloController
* @Description
*/
@RestController
public class HelloController {
@Autowired
HelloService helloService;
@GetMapping(value = "/sayHello")
public String sayHello() {
return helloService.sayHello("你好");
}
}
在application.yml中传入我们在austin-spring-boot-starter-autoconfigurer定义的两个参数prefix和suffix
8、启动springboot测试
您的一键三连，是我更新的最大动力，谢谢
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