Springboot中随时获取ApplicationContext,得到想要的bean

﹏ヽ暗。殇╰゛Y 2022-06-07 00:26 195阅读 0赞

在springBoot启动类的main方法中写成

/** * 启动嵌入式的Tomcat并初始化Spring环境 */
        public static void main(String[] args) throws Exception {
            ApplicationContext app = SpringApplication.run(WebApplication.class, args);
            SpringUtil.setApplicationContext(app);
            //SpringApplication.run(WebApplication.class, args);
        }

创建工具类

package com.yssoft.fs.supervise.utils;
    
    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显式注入，@Component是必须的，且该类必须与main同包或子包
        // 若非同包或子包，则需手动import 注入，有没有@Component都一样
        // 可复制到Test同包测试
    
        public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
            if(SpringUtil.applicationContext == null){
                SpringUtil.applicationContext  = applicationContext;
            }
            //查询所有预警任务,开启的预警任务自动开启
            RiskWarningTaskService riskWarningTaskServiceStatic=applicationContext.getBean(RiskWarningTaskService.class);
            List<EarlyWarningTask> earlyWarningTask = riskWarningTaskServiceStatic.findEarlyWarningTaskAll();
            for (EarlyWarningTask warningTask : earlyWarningTask) {
                //如果任务是打开的,可就开启任务
                if("1".equals(warningTask.getStat())){
                    riskWarningTaskServiceStatic.editState("1",warningTask.getId().toString(),warningTask.getTitle());
                    riskWarningTaskServiceStatic.editState("0",warningTask.getId().toString(),warningTask.getTitle());
                }
            }
        }
    
        //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);
        }
    
    }