不用参数注入获取bean

package com.kang;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/*
获取不到 httpRequest
获取bean的类
 */
@Component
public class Context implements ApplicationContextAware {
    private static ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    //   使用泛型，获取后不用强制类型转换
    public static <T> T getBean(String bean) {
        try {
            return (T) context.getBean(bean);
        }catch (BeansException e){
            return null;
        }
    }

    //   使用泛型，获取后不用强制类型转换
    public static <T> T getBean(Class<T> requiredType) {
        try {
            return context.getBean(requiredType);
        }catch (BeansException e){
            return null;
        }
    }
}