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

/**
 * 获取Spring上下文
 *
 * @author kelin.ll
 * @date on 2019/7/18
 */
@Component
public class ApplicationContextProvider implements ApplicationContextAware {
    /**
     * 上下文对象实例
     */
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    /**
     * 获取applicationContext
     *
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 通过name获取 Bean.
     *
     * @param name
     * @return
     */
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);
    }

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

    /**
     * 通过name,以及Clazz返回指定的Bean
     *
     * @param name
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }
}

测试用例：

import com.provider.ServiceProviderApplication;import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @author kelin.ll
 * @date on 2019/7/18
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = ServiceProviderApplication.class)
@Slf4j
public class ApplicationContextProviderTest {
    @Test
    public void getBeanByNameTest(){
        TaskService taskService = (TaskService)ApplicationContextProvider.getBean("taskService");
        System.out.println(taskService.getAll());
    }

    @Test
    public void getBeanByClassTest(){
        TaskService taskService = ApplicationContextProvider.getBean(TaskService.class);
        System.out.println(taskService.getAll());
    }

    @Test
    public void getBeanByNameAndClassTest(){
        TaskService taskService = ApplicationContextProvider.getBean("taskService",TaskService.class);
        System.out.println(taskService.getAll());
    }
}