SpringBoot中通过ApplicationContext获取bean对象

1.定义一个工具类

package com.example.redis.utils;

import com.example.redis.DemoApplication;
import org.springframework.beans.BeansException;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;

@Component
public class ApplicationContextUtils implements ApplicationContextAware{
    //放置在获取bean的时候提示空指针，将其定义为静态变量
    private static ApplicationContext context;

   //类初始化完成之后调用setApplicationContext()方法进行操作
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ApplicationContextUtils.context = applicationContext;
    }

   public static ApplicationContext geteContext(){
        return context;
    }

   public static Object getBean(String beanName){
        //在这一步的时候一定要注意，此时可调用这个方法的时候
        //context可能为空，会提示空指针异常，需要将其定义成静态的，这样类加载的时候
        //context就已经存在了
        return context.getBean(beanName);
    }
}

 

2.调用getBean()方法(注意首字母要小写)

RedisTemplate<Object,Object> redisTemplate =
                    (RedisTemplate<Object,Object>) ApplicationContextUtils.getBean("redisTemplate");
        //对key进行序列化
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.opsForHash().put(id.toString(),key.toString(),value);