编写api接口遇到的问题

package com.*.*;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication(scanBasePackages = {"com.*.*"})
@MapperScan("com.*.*.dao")
public class ApidemoApplication {

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