SpringBoot静态方法获取bean

通过实现ApplicationContextAware接口，可以获取ApplicationContext上下文，并在静态方法中获取bean

package com.example.springmybitsdynamicdatasource;

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

@Component
public class SpringContext implements ApplicationContextAware {
    /**
     * Spring 应用上下文环境
     */
    private static ApplicationContext applicationContext;

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

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 获取对象
     *
     * @param beanName
     * @return Object bean的实例
     * @throws BeansException
     */
    public static Object getBean(String beanName) throws BeansException {
        if (!SpringContext.containsBean(beanName)) {
            return null;
        } else {
            return applicationContext.getBean(beanName);
        }
    }

    /**
     * 获取类型为requiredType的对象
     * 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException）
     *
     * @param requiredType 返回对象类型
     * @return Object 返回requiredType类型对象
     * @throws BeansException
     */
    public static <T> T getBean(Class<T> requiredType) throws BeansException {
        return applicationContext.getBean(requiredType);
    }

    /**
     * 获取类型为requiredType的对象
     * 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException）
     *
     * @param name         bean注册名
     * @param requiredType 返回对象类型
     * @return Object 返回requiredType类型对象
     * @throws BeansException
     */
    public static <T> T getBean(String name, Class<T> requiredType) throws BeansException {
        return applicationContext.getBean(name, requiredType);
    }

    /**
     * @param requiredType
     * @param args
     * @return
     * @throws BeansException
     */
    public static <T> T getBean(Class<T> requiredType, Object... args) throws BeansException {
        return applicationContext.getBean(requiredType, args);
    }

    /**
     * @param name bean注册名
     * @param args
     * @return
     * @throws BeansException
     */
    public static Object getBean(String name, Object... args) throws BeansException {
        return applicationContext.getBean(name, args);
    }

    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义,则返回true
     *
     * @param name
     * @return boolean
     */
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
     * 如果与给定名字相应的bean定义没有被找到,将会抛出一个异常（NoSuchBeanDefinitionException）
     *
     * @param name
     * @return boolean
     * @throws NoSuchBeanDefinitionException
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    }

    /**
     * @param name
     * @return Class 注册对象的类型
     * @throws NoSuchBeanDefinitionException
     */
    @SuppressWarnings("rawtypes")
    public static Class getType(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getType(name);
    }

    /**
     * 如果给定的bean名字在bean定义中有别名,则返回这些别名
     *
     * @param name
     * @return
     * @throws NoSuchBeanDefinitionException
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getAliases(name);
    }

    public static boolean isReady() {
        if (applicationContext != null)
            return true;
        return false;
    }
}

使用

StudentDao studentDao = SpringContext.getBean(StudentDao.class);