Had I not seen the Sun[我本可以忍受黑暗]

I could have borne the shade[如果我不曾见过太阳]

But Light a newer Wilderness[然而阳光已使我的荒凉]

My Wilderness has made[成为更新的荒凉]

------Emily Dickinson

之前我们引用spring里的bean都是通过@Autowired或者@Resource注解获取

这里可以使用第三种方式

首先写个工具类

|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | hljs java package com.ruben.utils; /** * @ClassName: SpringContextHolder * @Date: 2020/11/12 0012 20:40 * @Description: */ import org.springframework.beans.BeansException; import org.springframework.beans.factory.DisposableBean; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Lazy; import org.springframework.stereotype.Component; import org.springframework.stereotype.Service; import java.util.Optional; /** * @ClassName: SpringContextHolder * @Description: 可以从applicationContext获取bean * @Date: 2020/11/12 0012 20:40 * * * @author: <achao1441470436@gmail.com> * @version: 1.0 * @since: JDK 1.8 */ @Lazy(false) @Component("SpringContextHolder") public class SpringContextHolder implements ApplicationContextAware, DisposableBean { private static ApplicationContext applicationContext; private static final String ERROR_MESSAGE = "applicationContext尚未注入"; @Override public void destroy() { applicationContext = null; } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { SpringContextHolder.applicationContext = applicationContext; } public static <T> T getBean(Class<T> type) { return Optional.ofNullable(applicationContext).orElseThrow(() -> new IllegalStateException(ERROR_MESSAGE)).getBean(type); } @SuppressWarnings("unchecked") public static <T> T getBean(String name) { return (T) Optional.ofNullable(applicationContext).orElseThrow(() -> new IllegalStateException(ERROR_MESSAGE)).getBean(name); } } |

然后就可以通过

|-----------|-----------------------------------------------------------------------------------------------------------------| | 1 | hljs java private static final UserService userService = SpringContextHolder.getBean(UserService.class); |

获取到注入到spring容器的bean

注意，如果是单体架构项目需要在引用时在对应的组件上加@DependsOn("SpringContextHolder")注解

或者是分布式项目的话，直接写到最顶层依赖部分就行