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

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本文介绍了一个SpringBoot项目的启动过程，并实现了一个工具类用于在启动时加载Spring上下文及初始化特定的服务。此外，还实现了自动开启符合条件的预警任务的功能。

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);
    }

}