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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.extra.spring;
import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.lang.TypeReference;
import cn.hutool.core.util.ArrayUtil;
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.ApplicationEvent;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.ResolvableType;
import org.springframework.stereotype.Component;
import java.lang.reflect.ParameterizedType;
import java.util.Arrays;
import java.util.Map;
/**
* Spring(Spring boot)工具封装，包括：
*
*
* - Spring IOC容器中的bean对象获取
* - 注册和注销Bean
*
*
* @author loolly
* @since 5.1.0
*/
@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
* 因此实现BeanFactoryPostProcessor注入ConfigurableListableBeanFactory实现bean的操作
*/
private static ConfigurableListableBeanFactory beanFactory;
/**
* Spring应用上下文环境
*/
private static ApplicationContext applicationContext;
@SuppressWarnings("NullableProblems")
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
SpringUtil.beanFactory = beanFactory;
}
@SuppressWarnings("NullableProblems")
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
SpringUtil.applicationContext = applicationContext;
}
/**
* 获取{@link ApplicationContext}
*
* @return {@link ApplicationContext}
*/
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
/**
* 获取{@link ListableBeanFactory}，可能为{@link ConfigurableListableBeanFactory} 或 {@link ApplicationContextAware}
*
* @return {@link ListableBeanFactory}
* @since 5.7.0
*/
public static ListableBeanFactory getBeanFactory() {
final ListableBeanFactory factory = null == beanFactory ? applicationContext : beanFactory;
if (null == factory) {
throw new UtilException("No ConfigurableListableBeanFactory or ApplicationContext injected, maybe not in the Spring environment?");
}
return factory;
}
/**
* 获取{@link ConfigurableListableBeanFactory}
*
* @return {@link ConfigurableListableBeanFactory}
* @throws UtilException 当上下文非ConfigurableListableBeanFactory抛出异常
* @since 5.7.7
*/
public static ConfigurableListableBeanFactory getConfigurableBeanFactory() throws UtilException {
final ConfigurableListableBeanFactory factory;
if (null != beanFactory) {
factory = beanFactory;
} else if (applicationContext instanceof ConfigurableApplicationContext) {
factory = ((ConfigurableApplicationContext) applicationContext).getBeanFactory();
} else {
throw new UtilException("No ConfigurableListableBeanFactory from context!");
}
return factory;
}
//通过name获取 Bean.
/**
* 通过name获取 Bean
*
* @param Bean类型
* @param name Bean名称
* @return Bean
*/
@SuppressWarnings("unchecked")
public static T getBean(String name) {
return (T) getBeanFactory().getBean(name);
}
/**
* 通过class获取Bean
*
* @param Bean类型
* @param clazz Bean类
* @return Bean对象
*/
public static T getBean(Class clazz) {
return getBeanFactory().getBean(clazz);
}
/**
* 通过name,以及Clazz返回指定的Bean
*
* @param bean类型
* @param name Bean名称
* @param clazz bean类型
* @return Bean对象
*/
public static T getBean(String name, Class clazz) {
return getBeanFactory().getBean(name, clazz);
}
/**
* 通过类型参考返回带泛型参数的Bean
*
* @param reference 类型参考，用于持有转换后的泛型类型
* @param Bean类型
* @return 带泛型参数的Bean
* @since 5.4.0
*/
@SuppressWarnings("unchecked")
public static T getBean(TypeReference reference) {
final ParameterizedType parameterizedType = (ParameterizedType) reference.getType();
final Class rawType = (Class) parameterizedType.getRawType();
final Class[] genericTypes = Arrays.stream(parameterizedType.getActualTypeArguments()).map(type -> (Class) type).toArray(Class[]::new);
final String[] beanNames = getBeanFactory().getBeanNamesForType(ResolvableType.forClassWithGenerics(rawType, genericTypes));
return getBean(beanNames[0], rawType);
}
/**
* 获取指定类型对应的所有Bean，包括子类
*
* @param Bean类型
* @param type 类、接口，null表示获取所有bean
* @return 类型对应的bean，key是bean注册的name，value是Bean
* @since 5.3.3
*/
public static Map getBeansOfType(Class type) {
return getBeanFactory().getBeansOfType(type);
}
/**
* 获取指定类型对应的Bean名称，包括子类
*
* @param type 类、接口，null表示获取所有bean名称
* @return bean名称
* @since 5.3.3
*/
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 属性值
* @since 5.3.3
*/
public static String getProperty(String key) {
if (null == applicationContext) {
return null;
}
return applicationContext.getEnvironment().getProperty(key);
}
/**
* 获取配置文件配置项的值
*
* @param key 配置项key
* @param defaultValue 默认值
* @return 属性值
* @since 5.8.24
*/
public static String getProperty(String key, String defaultValue) {
if (null == applicationContext) {
return null;
}
return applicationContext.getEnvironment().getProperty(key, defaultValue);
}
/**
* 获取配置文件配置项的值
*
* @param 属性值类型
* @param key 配置项key
* @param targetType 配置项类型
* @param defaultValue 默认值
* @return 属性值
* @since 5.8.24
*/
public static T getProperty(String key, Class targetType, T defaultValue) {
if (null == applicationContext) {
return null;
}
return applicationContext.getEnvironment().getProperty(key, targetType, defaultValue);
}
/**
* 获取应用程序名称
*
* @return 应用程序名称
* @since 5.7.12
*/
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 当前的环境配置
* @since 5.3.3
*/
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 当前的环境配置
* @since 5.3.3
*/
public static String getActiveProfile() {
final String[] activeProfiles = getActiveProfiles();
return ArrayUtil.isNotEmpty(activeProfiles) ? activeProfiles[0] : null;
}
/**
* 动态向Spring注册Bean
*
* 由{@link org.springframework.beans.factory.BeanFactory} 实现，通过工具开放API
*
* 更新: shadow 2021-07-29 17:20:44 增加自动注入，修复注册bean无法反向注入的问题
*
* @param Bean类型
* @param beanName 名称
* @param bean bean
* @author shadow
* @since 5.4.2
*/
public static void registerBean(String beanName, T bean) {
final ConfigurableListableBeanFactory factory = getConfigurableBeanFactory();
factory.autowireBean(bean);
factory.registerSingleton(beanName, bean);
}
/**
* 注销bean
*
* 将Spring中的bean注销，请谨慎使用
*
* @param beanName bean名称
* @author shadow
* @since 5.7.7
*/
public static void unregisterBean(String beanName) {
final ConfigurableListableBeanFactory factory = getConfigurableBeanFactory();
if (factory instanceof DefaultSingletonBeanRegistry) {
DefaultSingletonBeanRegistry registry = (DefaultSingletonBeanRegistry) factory;
registry.destroySingleton(beanName);
} else {
throw new UtilException("Can not unregister bean, the factory is not a DefaultSingletonBeanRegistry!");
}
}
/**
* 发布事件
*
* @param event 待发布的事件，事件必须是{@link ApplicationEvent}的子类
* @since 5.7.12
*/
public static void publishEvent(ApplicationEvent event) {
if (null != applicationContext) {
applicationContext.publishEvent(event);
}
}
/**
* 发布事件
* Spring 4.2+ 版本事件可以不再是{@link ApplicationEvent}的子类
*
* @param event 待发布的事件
* @since 5.7.21
*/
public static void publishEvent(Object event) {
if (null != applicationContext) {
applicationContext.publishEvent(event);
}
}
}
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