创建配置类，完全取代xml配置

package com.test5.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 * 使用该注解
 * 标识为配置类 替代xml配置文件
 */
@Configuration
/*
  开启组件扫描
 */
@ComponentScan(basePackages = {"com.test5"})
public class SpringConfig {
}

package com.test4.service;

import com.test5.config.SpringConfig;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class UserServiceTest {

    @Test
    public void add() {
        ApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
        UserService userService = context.getBean("userService", UserService.class);
        System.out.println("userService = " + userService);
        userService.add();
    }
}