准备条件

• 准备一个工具类，用于在非Spring管理的Bean中获取Spring容器中的Bean

  @Component
  public class SpringContextUtil implements ApplicationContextAware {
      private static ApplicationContext applicationContext = null;
  
      @Override
      public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
          if (SpringContextUtil.applicationContext == null) {
              SpringContextUtil.applicationContext = applicationContext;
          }
      }
  
      public static ApplicationContext getApplicationContext() {
          return applicationContext;
      }
  
      public static Object getBean(String name) {
          return getApplicationContext().getBean(name);
      }
  
      public static <T> T getBean(Class<T> clazz) {
          return getApplicationContext().getBean(clazz);
      }
  
      public static <T> T getBean(String name, Class<T> clazz) {
          return getApplicationContext().getBean(name, clazz);
      }
  
  }

main方法注入

• main方法是static，static方法内不能使用非static的变量或者方法，所以道理很简单，要想使用，先启动springboot应用，应用启动完毕后，所有的Bean肯定已经实例化完毕了，使用工具类从Spring容器里捞就行了

  public static void main(String[] args) {
      SpringApplication.run(ApiApplication.class, args);
      ApplicationContext applicationContext = SpringContextUtil.getApplicationContext();
      // 以获取RedisUtil的实例为例
      RedisUtil redisUtil = applicationContext.getBean(RedisUtil.class);
      String obj = redisUtil.getCacheObject("test");
  }