SpringBootStarterDemo

在我们的日常开发工作中,经常会有一些独立于业务之外的配置模块,我们经常将其放到一个特定的包下,然后如果另一个工程需要复用这块功能的时候,需要将代码硬拷贝到另一个工程,重新集成一遍,麻烦至极。如果我们将这些可独立于业务代码之外的功配置模块封装成一个个starter,复用的时候只需要将其在pom中引用依赖即可,SpringBoot为我们完成自动装配。

SpringBoot提供的starter以spring-boot-starter-xxx的方式命名的。官方建议自定义的starter使用xxx-spring-boot-starter命名规则。以区分SpringBoot生态提供的starter。

1、新建一个SpringBoot工程;

添加POM依赖:

       <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

2.定义一个实体类映射配置信息

@Data
@ConfigurationProperties(prefix = "demo")
public class DemoProperties {

    private String sayWhat;

    private String toWho;
}

3.定义一个Service

@Service
public class DemoService {

    private String sayWhat;

    private String toWho;

    public DemoService() {
    }

    public DemoService(String sayWhat, String toWho) {
        this.sayWhat = sayWhat;
        this.toWho = toWho;
    }

    public String say() {
        return sayWhat + "!  " + toWho;
    }
}

4.定义一个配置类

@Configuration
@EnableConfigurationProperties(value = DemoProperties.class)
@ConditionalOnProperty(prefix = "demo", name = "isOpen", havingValue = "true")
public class DemoConfig {

    @Autowired
    private DemoProperties properties;

    @Bean
    public DemoService demoService() {
        return new DemoService(properties.getSayWhat(), properties.getToWho());
    }
}

5.创建spring.factories文件

在resources的META-INF目录下新建spring.factories文件,定义内容:

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.demo.demospringbootstarter.config.DemoConfig

6.测试

1)、引入依赖:

        <dependency>
            <groupId>com.demo</groupId>
            <artifactId>demo-spring-boot-starter</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

2)、配置文件:

在application.properties配置文件中增加如下配置项:

demo.isOpen=true
demo.say-what=hello
demo.to-who=bill gates

3)、编写测试类:

@RestController
public class DemoController {

    @Resource
    private DemoService demoService;

    @GetMapping("/demo")
    public String demo() {
        return demoService.say();
    }
}

4)、运行调试;

 

参考资料:

https://www.cnblogs.com/duanxz/p/3507178.html

posted on 2020-08-10 15:14  小夏coding  阅读(333)  评论(0编辑  收藏  举报

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