【定制化体验：使用Spring Boot自动配置，打造个性化Starter】

项目结构

在这里插入图片描述

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>

    <groupId>com.custom</groupId>
    <artifactId>spring-boot-starter-custom</artifactId>
    <version>0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <description>封装一个简单User组件</description>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.5.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.5.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <version>2.5.8</version>
        </dependency>
    </dependencies>
</project>

spring.factories 注意书写格式

# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.custom.config.UserAutoConfiguration

UserService （最后注入成bean）

public class UserService {
    private String name;
    private String age;
    private Long id;


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void pint() {
        System.out.println(String.format("获取的数据用户名：%s----密码：%s----id:%s", name, age, id));
    }
}

UserProperties （用户配置）

@ConfigurationProperties(prefix = "song.user")
public class UserProperties {
    private String start;
    private String name;
    private String age;
    private Long id;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getStart() {
        return start;
    }

    public void setStart(String start) {
        this.start = start;
    }
}

最关键的配置自动配置类一定要看注释

/**
 * 功能描述： 自动配置类
 *
 * @author Songxianyang
 * @date 2024-04-26 13:40
 */
@Configuration
// yaml档中song.user.start 有没有  如果没有则无法自动配置改类
@ConditionalOnProperty(prefix = "song.user", name = {"start"})
// 把yml配置的属性注入进来 然后使用它。启动自动配置属性
@EnableConfigurationProperties(UserProperties.class)
public class UserAutoConfiguration {
    @Bean
    public UserService userService(UserProperties userProperties) {
        UserService userService = new UserService();
        userService.setId(userProperties.getId());
        userService.setName(userProperties.getName());
        userService.setAge(userProperties.getAge());
        return userService;
    }
}