[TOC] # 簡介 在springboot中有一種實現方式，可以很方便的獲取到ApplicationContext對象：SpringBoot平臺下采用ApplicationContextAware的方式完成ApplicationContext實例的獲取，并通過ApplicationContext實例完成對Spring管理的Bean實例手動獲取。 創建一個實體類SpringUtil并實現ApplicationContextAware接口，重寫接口內的setApplicationContext方法來完成獲取ApplicationContext實例的方法。 如下為ApplicationContextAware接口： ~~~ public interface ApplicationContextAware extends Aware { void setApplicationContext(ApplicationContext var1) throws BeansException; } ~~~ 注意兩個地方： 1. SpringUtil類上的 @Component注解必須要有，否則spring就不會自動調用setApplicationContext方法來為我們設置上下文實例； 2. SpringUtil類要在springboot可以掃描到的包下； # 實現 在springBoot啟動類的main方法中寫成 ~~~ /** * 啟動嵌入式的Tomcat并初始化Spring環境 */ public static void main(String[] args) throws Exception { ApplicationContext app = SpringApplication.run(WebApplication.class, args); SpringUtil.setApplicationContext(app); //SpringApplication.run(WebApplication.class, args); } ~~~ 創建工具類 ~~~ import com.yssoft.fs.repository.entity.comm.EarlyWarningTask; import com.yssoft.fs.supervise.service.riskWarning.RiskWarningTaskService; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import javax.annotation.Resource; import java.util.List; public class SpringUtil { private static ApplicationContext applicationContext = null; // 非@import顯式注入，@Component是必須的，且該類必須與main同包或子包 // 若非同包或子包，則需手動import 注入，有沒有@Component都一樣 // 可復制到Test同包測試 public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if(SpringUtil.applicationContext == null){ SpringUtil.applicationContext = applicationContext; } //查詢所有預警任務,開啟的預警任務自動開啟 RiskWarningTaskService riskWarningTaskServiceStatic=applicationContext.getBean(RiskWarningTaskService.class); List<EarlyWarningTask> earlyWarningTask = riskWarningTaskServiceStatic.findEarlyWarningTaskAll(); for (EarlyWarningTask warningTask : earlyWarningTask) { //如果任務是打開的,可就開啟任務 if("1".equals(warningTask.getStat())){ riskWarningTaskServiceStatic.editState("1",warningTask.getId().toString(),warningTask.getTitle()); riskWarningTaskServiceStatic.editState("0",warningTask.getId().toString(),warningTask.getTitle()); } } } //獲取applicationContext public static ApplicationContext getApplicationContext() { return applicationContext; } //通過name獲取 Bean. public static Object getBean(String name){ return getApplicationContext().getBean(name); } //通過class獲取Bean. public static <T> T getBean(Class<T> clazz){ return getApplicationContext().getBean(clazz); } //通過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); } } ~~~