import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.DefaultSingletonBeanRegistry;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;
import java.util.Map;
/**
* Spring 工具类
* @ClassName SpringUtil
* @Author YH
* @Date 2021/12/3
* @Version 1.0
*/
@Component
public class SpringUtil implements BeanFactoryPostProcessor, ApplicationContextAware {
/**
* "@PostConstruct" 注解标记的类中,由于 ApplicationContext 还未加载,导致空指针<br>
* 因此实现 BeanFactoryPostProcessor 注入 ConfigurableListableBeanFactory 实现 Bean 的操作
*/
private static ConfigurableListableBeanFactory beanFactory;
/**
* Spring 容器
*/
private static ApplicationContext applicationContext;
/**
* 私有化构造方法
*/
private SpringUtil() {
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
SpringUtil.beanFactory = beanFactory;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
SpringUtil.applicationContext = applicationContext;
}
/**
* 获取 ConfigurableListableBeanFactory
* @return
* @throws RuntimeException
*/
public static ConfigurableListableBeanFactory getConfigurableBeanFactory() throws RuntimeException {
final ConfigurableListableBeanFactory factory;
if (null != beanFactory) {
factory = beanFactory;
} else if (applicationContext instanceof ConfigurableApplicationContext) {
factory = ((ConfigurableApplicationContext) applicationContext).getBeanFactory();
} else {
throw new RuntimeException("No ConfigurableListableBeanFactory from context!");
}
return factory;
}
/**
* 获取 Spring 容器
* @return
*/
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
public static ListableBeanFactory getBeanFactory() {
return null == beanFactory ? applicationContext : beanFactory;
}
/**
* 根据名称获取 Bean
* @param name 名称
* @param <T> 返回类型
* @return
*/
public static <T> T getBean(String name) {
return (T) applicationContext.getBean(name);
}
/**
* 根据类型获取 Bean
* @param clazz
* @param <T>
* @return
*/
public static <T> T getBean(Class<T> clazz) {
return getBeanFactory().getBean(clazz);
}
/**
* 根据名称和类型获取 Bean
* @param name 名称
* @param clazz 类型
* @param <T>
* @return
*/
public static <T> T getBean(String name, Class<T> clazz) {
return getBeanFactory().getBean(name, clazz);
}
/**
* 获取指定类型对应的所有 Bean,包括子类
* @param type
* @param <T>
* @return
*/
public static <T> Map<String, T> getBeansOfType(Class<T> type) {
return getBeansOfType(type);
}
/**
* 获取指定类型对应的 Bean 名称,包括子类
* @param type
* @return
*/
public static String[] getBeanNamesForType(Class<?> type) {
return getBeanFactory().getBeanNamesForType(type);
}
/**
* 获取配置文件配置项的值
* @param key 配置项 key
* @return
*/
public static String getProperty(String key) {
return applicationContext.getEnvironment().getProperty(key);
}
/**
* 获取应用程序名称
* @return
*/
public static String getApplicationName() {
return getProperty("spring.application.name");
}
/**
* 获取当前的环境配置,无配置返回 null
* @return
*/
public static String[] getActiveProfiles() {
if (null == applicationContext) {
return null;
}
return applicationContext.getEnvironment().getActiveProfiles();
}
/**
* 获取当前的环境配置,当有多个环境配置时,只获取第一个
* @return
*/
public static String getActiveProfile() {
final String[] activeProfiles = getActiveProfiles();
if (activeProfiles == null || activeProfiles.length == 0) {
return null;
}
return activeProfiles[0];
}
/**
* 动态向 Spring 容器中注册 Bean
* @param beanName 名称
* @param bean 类型
* @param <T>
*/
public static <T> void registerBean(String beanName, T bean) {
final ConfigurableListableBeanFactory factory = getConfigurableBeanFactory();
factory.autowireBean(bean);
factory.registerSingleton(beanName, bean);
}
/**
* 向容器中注销 Bean
* @param beanName 名称
* @param <T>
*/
public static <T> void logoutBean(String beanName) {
final ConfigurableListableBeanFactory factory = getConfigurableBeanFactory();
if (factory instanceof DefaultSingletonBeanRegistry) {
DefaultSingletonBeanRegistry registry = (DefaultSingletonBeanRegistry) factory;
registry.destroySingleton(beanName);
} else {
throw new RuntimeException("Can not unregister bean, the factory is not a DefaultSingletonBeanRegistry!");
}
}
/**
* 发布事件
* @param event
*/
public static void publishEvent(ApplicationContext event) {
if (null != applicationContext) {
applicationContext.publishEvent(event);
}
}
}
Spring 容器工具类
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转载自blog.csdn.net/m0_52462015/article/details/121704226
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