package com.dy.common.springUtil;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.MutablePropertyValues;
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import org.springframework.beans.factory.support.DefaultListableBeanFactory;
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import org.springframework.beans.factory.support.GenericBeanDefinition;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ApplicationContextAware;
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import org.springframework.stereotype.Component;
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import java.util.Map;
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/**
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* 获取Springboot上下文，并通过上下文可以获取配置文件中的配置参数。
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* SpringBoot启动时，发现本类注解了@Component，会加载本类并实例化，
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* 实例化时发现本类实现了接口ApplicationContextAware，则会调用
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* setApplicationContext方法设置Spring上下文对象
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*/
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@Component
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public class SpringContextUtil implements ApplicationContextAware {
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private static ApplicationContext applicationContext = null;
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@Override
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public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
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if (SpringContextUtil.applicationContext == null) {
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SpringContextUtil.applicationContext = applicationContext;
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}
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}
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//获取applicationContext
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public static ApplicationContext getApplicationContext() {
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return applicationContext;
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}
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//通过name获取 Bean.
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public static Object getBean(String name) {
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return getApplicationContext().getBean(name);
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}
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//通过class获取Bean.
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public static <T> T getBean(Class<T> clazz) {
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return getApplicationContext().getBean(clazz);
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}
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/**
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* 同步方法注册bean到ApplicationContext中
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*
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* @param beanName
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* @param clazz
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* @param original bean的属性值
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*/
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public static synchronized void setBean(String beanName, Class<?> clazz, Map<String,Object> original) {
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//checkApplicationContext();
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DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) applicationContext.getAutowireCapableBeanFactory();
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if(beanFactory.containsBean(beanName)){
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return;
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}
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//BeanDefinition beanDefinition = new RootBeanDefinition(clazz);
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GenericBeanDefinition definition = new GenericBeanDefinition();
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//类class
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definition.setBeanClass(clazz);
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//属性赋值
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definition.setPropertyValues(new MutablePropertyValues(original));
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//注册到spring上下文
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beanFactory.registerBeanDefinition(beanName, definition);
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}
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}
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