技術標籤：SpringBoot

準備工作：

1、建立兩個模組

mavne:atlgq-spring-boot-starter	//starter，負責引入自動裝配
spring:atlgq-spring-boot-starter-autoconfigurer //負責自動裝配

2、把不需要的檔案和依賴都刪除

atlgq-spring-boot-starter-autoconfigurer

pom只留下starter，把主啟動都刪掉

1）、啟動器模組

atlgq-spring-boot-starter

只負責引入自動配置模組

<?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.atlgq</groupId>
    <artifactId>atlgq-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!--starter，只需要引用這個starter就可以了-->

    <dependencies>
        <dependency>
            <!--從atlgq-spring-boot-starter-autoconfigurer的pom檔案引入-->
 

            <groupId>com.atlgq</groupId>
            <artifactId>atlgq-spring-boot-starter-autoconfigurer</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

2）、自動配置模組

atlgq-spring-boot-starter-autoconfigurer

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<!--這是我們配置的自動裝配-->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.4.0</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.atlgq</groupId>
	<artifactId>atlgq-spring-boot-starter-autoconfigurer</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>atlgq-spring-boot-starter-autoconfigurer</name>
	<description>Demo project for Spring Boot</description>

	<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；所有的starter的基本配置-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>


	</dependencies>

</project>

3）、配置properties檔案內容

package com.atlgq.atlgq.starter;

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

//宣告這是一個properties類，而且要配置它的話得以atlgq.hello開頭
@ConfigurationProperties(prefix = "atlgq.hello")
public class HelloProperties {

    private String prefix;
    private String suffix;

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }

    public String getPrefix() {
        return prefix;
    }

    public String getSuffix() {
        return suffix;
    }
}

4）、配置service檔案

package com.atlgq.atlgq.starter;

public class HelloService {

    HelloProperties helloProperties;

    public void setHelloProperties(HelloProperties helloProperties) {
        this.helloProperties = helloProperties;
    }

    public HelloProperties getHelloProperties() {
        return helloProperties;
    }

    public String sayHello(String name){
        return helloProperties.getPrefix() + "_" + name + "_" + helloProperties.getSuffix();
    }
}

5）、配置autoConfiguration檔案

package com.atlgq.atlgq.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 //宣告這是一個配置檔案
@ConditionalOnWebApplication //是否是web應用模組
@EnableConfigurationProperties(HelloProperties.class) //所引入的Properties檔案是哪一個
public class HelloAutoConfiguration {
	//引入配置檔案
    @Autowired
    HelloProperties helloProperties;
	//配置進去IOC容器
    @Bean
    public HelloService helloService(){
        //裝載服務
        HelloService helloService = new HelloService();
        //配置檔案
        helloService.setHelloProperties(helloProperties);
        return helloService;
    }
}

然後把這個包install出去，我們就可以在maven倉庫中引用了，引用的程式碼是

<!--引入自定義的模組-->
        <dependency>
            <groupId>com.atlgq</groupId>
            <artifactId>atlgq-spring-boot-starter</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

我們可以在需要用到這個starter的地方引入

新建一個springboot專案，新建一個controller，使用這個我們自己的starter

 	@Autowired
    HelloService helloService;

    @GetMapping(value = "/hello")
    public String hello(){
        String atlgq = helloService.sayHello("atlgq");
        return atlgq;
    }

如果要配置starter裡面的東西，我們可以在application.properties檔案裡面配置，這個atlgq.hello取決於我們編寫starter裡面properties檔案的設定

atlgq.hello.prefix="hello"
atlgq.hello.suffix=",are you ok?"

結果展示:

視訊教學:尚矽谷雷豐陽老師