springboot获取getBean方法以及ApplicationContext空指针问题解决

场景：在springboot多模块中使用getBean获取bean导致空指针异常。

 @Test
  public void test1(){
      IUserService userService = SpringContextHolder.getBean(UserServiceImpl.class);
      User user = userService.getUserByMobile("18782080356");
      System.out.println(user);
  }

假如有个工程有common模块和admin(启动类模块)模块，获取getBean的类在admin中，则不会报空指针，如果在common模块中，在admin模块中调用，则会报空指针异常，解决方法，使用@Import导入getBean方法所在的类

@SpringBootApplication
@Import(SpringContextHolder.class)
public class AdminApplication {

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

}

import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.util.Map;

/**
 * spring工具类 方便在非spring管理环境中获取bean
 *
 * @author ruoyi
 */
@Component
public final class SpringContextHolder implements BeanFactoryPostProcessor
{
    /** Spring应用上下文环境 */
    private static ConfigurableListableBeanFactory beanFactory;

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
    {
        SpringContextHolder.beanFactory = beanFactory;
    }

    /**
     * 获取对象
     *
     * @param name
     * @return Object 一个以所给名字注册的bean的实例
     * @throws org.springframework.beans.BeansException
     *
     */
    @SuppressWarnings("unchecked")
    public static  T getBean(String name) throws BeansException
    {
        return (T) beanFactory.getBean(name);
    }

    /**
     * 获取类型为requiredType的对象
     *
     * @param clz
     * @return
     * @throws org.springframework.beans.BeansException
     *
     */
    public static  T getBean(Class clz) throws BeansException
    {
        T result = (T) beanFactory.getBean(clz);
        return result;
    }

    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
     *
     * @param name
     * @return boolean
     */
    public static boolean containsBean(String name)
    {
        return beanFactory.containsBean(name);
    }

    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
     *
     * @param name
     * @return boolean
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
     *
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException
    {
        return beanFactory.isSingleton(name);
    }

    /**
     * @param name
     * @return Class 注册对象的类型
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
     *
     */
    public static Class getType(String name) throws NoSuchBeanDefinitionException
    {
        return beanFactory.getType(name);
    }

    /**
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名
     *
     * @param name
     * @return
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
     *
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException
    {
        return beanFactory.getAliases(name);
    }


    public static Map getBeansWithAnnotation(Class annotationType){
        return beanFactory.getBeansWithAnnotation(annotationType);
    }

    /**
     * 获取aop代理对象
     *
     * @param invoker
     * @return
     */
    @SuppressWarnings("unchecked")
    public static  T getAopProxy(T invoker)
    {
        return (T) AopContext.currentProxy();
    }
}

``