（springboot）自定义Starter

要引入的jar项目，即自定义的Starter项目：

pom:(这里不能引入springboot整合否则测试项目注入失败)

<?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.example</groupId>

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

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <properties>

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

    </properties>

    <dependencies>

        <dependency>

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

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

            <version>2.0.0.RELEASE</version>

        </dependency>

        <dependency>

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

            <artifactId>spring-boot-configuration-processor</artifactId>

            <version>2.0.0.RELEASE</version>

            <optional>true</optional>

        </dependency>

    </dependencies>

</project>

HelloAutoConfiguration：

package com.example.springbootstarterhello.config;

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

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;

import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;

import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;

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

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration//开启配置

@EnableConfigurationProperties(HelloProperties.class)//开启使用映射实体对象

@ConditionalOnClass(HelloService.class)//存在HelloService时初始化该配置类

@ConditionalOnProperty//存在对应配置信息时初始化该配置类

        (

                prefix = "hello",//存在配置前缀hello

                value = "enabled",//开启

                matchIfMissing = true//缺失检查

        )

public class HelloAutoConfiguration {

    //application.properties配置文件映射前缀实体对象

    @Autowired

    private HelloProperties helloProperties;

    /**

     * 根据条件判断不存在HelloService时初始化新bean到SpringIoc

     *

     * @return

     */

    @Bean//创建HelloService实体bean

    @ConditionalOnMissingBean(HelloService.class)//缺失HelloService实体bean时，初始化HelloService并添加到SpringIoc

    public HelloService helloService() {

        System.out.println(">>>The HelloService Not Found，Execute Create New Bean.");

        HelloService helloService = new HelloService();

        helloService.setMsg(helloProperties.getMsg());//设置消息内容

        return helloService;

    }

}

HelloProperties：

package com.example.springbootstarterhello.config;

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

@ConfigurationProperties(prefix = "hello")

public class HelloProperties {

    private String msg = "test wode cesgi";

    public String getMsg() {

        return msg;

    }

    public void setMsg(String msg) {

        this.msg = msg;

    }

}

HelloService：

package com.example.springbootstarterhello.config;

public class HelloService {

    private String msg;

    public String sayHello() {

        return msg;

    }

    public void setMsg(String msg) {

        this.msg = msg;

    }

}

src/main/resources/META-INF/spring.factories

注意：META-INF是自己手动创建的目录，spring.factories也是手动创建的文件,在该文件中配置自己的自动配置类

#配置自定义Starter的自动化配置

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.example.springbootstarterhello.config.HelloAutoConfiguration

测试项目：

pom:

<?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>2.1.5.RELEASE</version>

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

    </parent>

    <groupId>com.example</groupId>

    <artifactId>test002</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>test002</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>

        <dependency>

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

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

            <scope>test</scope>

        </dependency>

      <---这里引入外来starter-->

        <dependency>

            <groupId>com.example</groupId>

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

            <version>0.0.1-SNAPSHOT</version>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

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

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

            </plugin>

        </plugins>

    </build>

</project>

Test:

package com.example.test002;

import com.example.springbootstarterhello.config.HelloService;

import org.junit.Test;

import org.junit.runner.RunWith;

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

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)

@SpringBootTest

public class Test002ApplicationTests {

    @Autowired

    private HelloService helloService;

    @Test

    public void contextLoads() {

    }

    @Test

    public void rere(){

        System.out.println(helloService.sayHello());

    }

}

参考：https://blog.csdn.net/vbirdbest/article/details/79863883

（springboot）自定义Starter的相关教程结束。