使用SpringBoot自定义starter详解

一、新建一个工程

工程由xxx-sprig-boot-starter和xxx-sprig-boot-starter-configure两个模块组成；

xxx-sprig-boot-starter模块

• 只用来做依赖导入
• 依赖于 xxx-sprig-boot-starter-configure模块，没有实际代码

<?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.ander</groupId>
    <artifactId>ander-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--依赖ander-spring-boot-starter-configure工程-->
    <dependencies>
        <dependency>
            <groupId>com.ander</groupId>
            <artifactId>ander-spring-boot-starter-configure</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

xxx-sprig-boot-starter-configure模块

• 专门自动配置模块
• 依赖于spring-boot-starter-web

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.ander</groupId>
    <artifactId>ander-spring-boot-starter-configure</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>ander-spring-boot-starter-configure</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>
    </dependencies>

</project>

二、xxx-sprig-boot-starter-configure模块自动配置编码

2.1 服务层编码

/**
 * Service层
 *
 * @Author: Ander
 * @Date: 2021-05-04
 */
public class HelloService {

    private HelloServiceProperties helloServiceProperties;

    public String helloService(String name) {
        return helloServiceProperties.getPrefix() + " "+ name + " " + helloServiceProperties.getSuffix();
    }

    public HelloServiceProperties getHelloServiceProperties() {
        return helloServiceProperties;
    }

    public void setHelloServiceProperties(HelloServiceProperties helloServiceProperties) {
        this.helloServiceProperties = helloServiceProperties;
    }
}

2.2 属性配置类编码

/**
 * 属性配置类
 *
 * @Author: Ander
 * @Date: 2021-05-04
 */
@ConfigurationProperties(prefix = "com.ander")
public class HelloServiceProperties {

    private String prefix = "hi";
    private String suffix = "hello world";

    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;
    }
}

2.3 starter自动配置类编码

@EnableConfigurationProperties({HelloServiceProperties.class})作用：让xxxProperties生效加入到容器中

/**
 * 自定义starter自动配置类
 *
 * @Author: Ander
 * @Date: 2021-05-04
 */
@Configuration
@ConditionalOnWebApplication // 指定web应用才生效
@EnableConfigurationProperties({HelloServiceProperties.class})
public class HelloServiceAutoConfigure {

    @Autowired
    private HelloServiceProperties helloServiceProperties;

    @Bean
    public HelloService helloService() {
        HelloService helloService = new HelloService();
        helloService.setHelloServiceProperties(helloServiceProperties);
        return helloService;
    }
}

2.4 添加自动配置类到META-INF路径下

2.5 将工程安装到本地

注意先安装xxx-spring-boot-starter-configure，再安装xxx-spring-boot-starter

三、新建一个工程测试自定义starter

3.1 编写controller层

/**
 * starter测试控制类
 *
 * @Author: Ander
 * @Date: 2021-05-05
 */
@RestController
public class StarterTestController {

    @Autowired
    private HelloService helloService;

    @GetMapping("hello")
    public String hello(String name) {
        return helloService.helloService(name);
    }
}

3.2 编写配置文件

server.port=8888
com.ander.prefix=HI
com.ander.suffix=HELLO WORLD

四、测试结果

4.1 使用starter默认配置

4.2 使用自定义配置

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