项目需求需要写一个starter，记录一下
start基本要用到的类
AutoConfiguration 将需要自动注入的类写在这里面
service 业务实现类
properties 配置类

AutoConfiguration 类

@Configuration
@ConditionalOnClass(value = {FtpService.class, ErpFtpClientFactory.class})
@EnableConfigurationProperties(FtpProperties.class)
public class FtpAutoConfiguration {
    /**
     * 配置类
     */
    @Autowired
    FtpProperties ftpProperties;

    /**
     * FtpService 主要功能类（上传/下载）
     * @return
     */
    @Bean
    @ConditionalOnMissingBean(FtpService.class)
    public FtpService ftpService() {
        FtpService ftpService = new FtpService();
        return ftpService;
    }

    /**
     * 文件操作工具类
     * @return
     */
    @Bean
    @ConditionalOnMissingBean(ErpFtpClientFactory.class)
    public ErpFtpClientFactory erpFtpClientFactory() {
        ErpFtpClientFactory erpFtpClientFactory = new ErpFtpClientFactory();
        ErpFtpClientFactory.properties = ftpProperties;
        return erpFtpClientFactory;
    }
}

配置类

@Getter
@Setter
@ConfigurationProperties(prefix = "ftp.user")
//ftp.user 在业务端yml文件配置的前缀
public class FtpProperties {
    private static final String DEFAULT_USER_NAME = "";
    private static final String DEFAULT_PASSWORD = "";
    private static final String DEFAULT_ADDRESS = "";
    private static final String DEFAULT_POOT ="" ;
    private static final String DEFAULT_ROOT = "";
    private String userName = DEFAULT_USER_NAME;
    private String password =DEFAULT_PASSWORD;
    private String loginAddress=DEFAULT_ADDRESS;
    private String port=DEFAULT_POOT;
    private String root=DEFAULT_ROOT;

}

在service层写所需业务。

最后在resource文件夹下面建立META-INF 文件，添加名为spring.factories 文件填写

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.gw.ftp.config.AutoConfiguration