自己实现一个自己的自动配置

项目

xm-common:普通jar项目

• src/main
  java
  BambooServer.java 需要被实例化的服务类
  BambooServerProperties.java 配置信息属性类
  BmbooServiceAutoConfiguration.java 自动配置类
  resources
  META-INF/spring.factories 配置自动配置的属性文件
  demo:普通springboot-web项目

需要实例化的服务类

public class BambooServer {
    private String name;

    public String sayServerName(){
        return "I'm " + name + "! ";
    }

    public String getName() {
        return name;
    }

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

}

配置信息对应的属性映射类,需要pom中加入spring-boot-starter依赖

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

@ConfigurationProperties(prefix = "bamboo")
public class BambooServerProperties {

    private static final String NAME = "bamboo_server0";

    private String name = NAME;

    public String getName() {
        return name;
    }

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

自动配置文件

/**
 * Author: bamboo
 * Time: 2018/11/25/025
 * Describe: 自动配置类
 * 根据条件判断是否要自动配置，创建Bean
 */
@Configuration
@EnableConfigurationProperties(BambooServerProperties.class)
@ConditionalOnClass(BambooServer.class)//判断BambooServer这个类在类路径中是否存在
@ConditionalOnProperty(prefix = "bamboo",value = "enabled",matchIfMissing = true)
public class BmbooServiceAutoConfiguration {

    @Autowired
    private BambooServerProperties mistraServiceProperties;

    @Bean(name = "bambooServer")
    @ConditionalOnMissingBean(BambooServer.class)//当容器中没有这个Bean时(BambooServer)就自动配置这个Bean，Bean的参数来自于BambooServerProperties
    public BambooServer mistraService(){
        BambooServer mistraService = new BambooServer();
        mistraService.setName(mistraServiceProperties.getName());
        return mistraService;
    }
}

在创建如下路径文件src/main/resources/META-INF/spring.factories

# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.bamboo.common.autoconfigure.bamboo.BmbooServiceAutoConfiguration

必须是自动配置类的全路径

mvn install 该项目

创建一个springboot-mvc项目pom依赖上面的jar

@SpringBootApplication
@RestController
@Import(value = {CorsConfig.class, LogFilter.class}) //跨域,接口访问请求日志
public class DemoApplication {
    @Autowired
    private BambooServer bmbooService;

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @RequestMapping("/")
    public Object index(){
        return "helll demo"+bmbooService.getName()+DateUtils.getDate();
    }
}

http://localhost:8080/则返回当前服务的默认值

在applicaton.yml中加,重启刷新则会更新为如下信息

bamboo:
name: 测试服务