有时候想调用service层的方法，但是在非Controller层注入不了spring的bean，所以我们直接写一个帮助类来获取，原理是直接去spring容器里根据命名来获取bean对象。另外方便测试的话可以将service注入启动类，非Controller层再从启动类中调用service即可
spring容器获取bean对象帮助类
@Component @Lazy(false) public class SpringUtil implements ApplicationContextAware { private static ApplicationContext applicationContext; //获取applicationContext public static ApplicationContext getApplicationContext() { return applicationContext; } //通过name获取 Bean. 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); } //通过name,以及Clazz返回指定的Bean public static <T> T getBean(String name, Class<T> clazz) { return getApplicationContext().getBean(name, clazz); } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if (SpringUtil.applicationContext == null) { SpringUtil.applicationContext = applicationContext; } } private SpringUtil() { } }