在spring boot中 获取应用程序上下文对象ApplicationContext

1、新建类SpringContextHolder

package org.example.spring_test.config;

import lombok.Getter;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextHolder implements ApplicationContextAware {

    @Getter
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext context) {
        SpringContextHolder.applicationContext = context;
    }

}

2、假设测试类及其方法如下

package org.example.spring_test.service;

import org.springframework.stereotype.Component;

@Component
public class BusinessService {

    public String sayHello() {
        return "Hello World";
    }
}

3、获取上下文对象，并调用方法如下：

@GetMapping("/hello")
    public String hello(){
        ApplicationContext applicationContext=SpringContextHolder.getApplicationContext();
//        ApplicationContext ctx=new ClassPathXmlApplicationContext("services.xml");
//        BusinessService businessService=ctx.getBean(BusinessService.class);
        BusinessService businessService=applicationContext.getBean(BusinessService.class);
        return businessService.sayHello();
    }