实现初始化器的方式二：

SpringApplication初始化完毕后手动添加

新建一个springBoot项目：

[往期文章：怎么新建一个springBoot项目] https://www.jianshu.com/p/18f5bd189ced

新建SecondInitializer.java:

新建SecondInitializer.java.png

新建TestService.java

新建TestService.java.png

新建controller方法：

新建controller方法.png

修改项目启动方式：

修改项目启动方式

浏览器访问获取初始化器配置信息：

浏览器访问获取初始化器配置信息

SecondInitializer.java源码：

package com.xy.initializer;

import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;

import java.util.HashMap;
import java.util.Map;

@Order(2)
public class SecondInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        ConfigurableEnvironment environment =applicationContext.getEnvironment();
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("xy2","my name is SecondInitializer!");
        MapPropertySource mapPropertySource = new MapPropertySource("secondInitializer",map);
        environment.getPropertySources().addLast(mapPropertySource);
        System.out.println("Run SecondInitializer");
    }
}

TestService.java源码：

package com.xy.service;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class TestService implements ApplicationContextAware {
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        System.out.println("test setApplicationContext......");
        this.applicationContext = applicationContext;
    }

    public String test(){
        System.out.println(applicationContext.getBean(DemoService.class));
        DemoService t = applicationContext.getBean(DemoService.class);
        return applicationContext.getEnvironment().getProperty("xy2");
    }
}

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