Spring获取ApplicationContext的工具类

工具类实现ApplicationContextAware接口，并重写setApplicationContext(ApplicationContext applicationContext)方法，在工具类中使用@Component注解让spring进行管理。spring容器在启动的时候，会调用setApplicationContext()方法将ApplicationContext 对象设置进去。

package com.xxx.utils;

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

@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
    }

    //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);
    }

}

（2）获取xxMapper 

private HkSignInfoMapper hkSignInfoMapper = (HkSignInfoMapper)SpringUtil.getBean("hkSignInfoMapper");

（3）获取xxservice

private ElAppInfoService elAppInfoService = (ElAppInfoService)SpringUtil.getBean(ElAppInfoService.class);