java普通类调用mapper或者service方法详解

@Component
public class Test {
    @Resource
    SecurityUserMapper securityUserMapper;
    public static Test test;
    @PostConstruct
    public void init(){
        test=this;
        test.securityUserMapper=securityUserMapper;
    }
    public static SecurityUserEntity select(int id){
        return test.securityUserMapper.selectById(id);
    }

}

package com.helei.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        // TODO Auto-generated method stub
        if (SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
            System.out.println(
                    "========ApplicationContext配置成功,在普通类可以通过调用ToolSpring.getAppContext()获取applicationContext对象,applicationContext="
                            + applicationContext + "========");
        }
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

}

package com.helei.util;

import com.helei.mapper.SecurityUserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class JzShopApplicationTests {
	

	@Test
	public void contextLoads() {
		//GoodsServiceImpl为我想要获取的service层中的类
		SecurityUserMapper securityUserMapper = (SecurityUserMapper)SpringUtil.getBean(SecurityUserMapper.class);
		System.out.println(securityUserMapper.selectById(1));
	}
}