获取application的上下文,获取bean对象及相关信息
package cn.sccl.common.util; import javax.servlet.http.HttpServletRequest; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; public class ContextUtil implements ApplicationContextAware { private static ApplicationContext applicationContext; // Spring应用上下文环境 /** * 实现ApplicationContextAware接口的回调方法,设置上下文环境 * * @param applicationContext * @throws BeansException */ public void setApplicationContext(ApplicationContext applicationContext) { ContextUtil.applicationContext = applicationContext; } /** * @return ApplicationContext */ public static ApplicationContext getApplicationContext() { return applicationContext; } /** * 获取对象 * * @param name * @return Object 一个以所给名字注册的bean的实例 * @throws BeansException */ public static Object getBean(String name) { return applicationContext.getBean(name); } /** * 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 */ @SuppressWarnings("unchecked") public static Object getBean(String name, Class requiredType) { return applicationContext.getBean(name, requiredType); } /** * 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) { return applicationContext.isSingleton(name); } /** * @param name * @return Class 注册对象的类型 * @throws NoSuchBeanDefinitionException */ @SuppressWarnings("unchecked") public static Class getType(String name) { 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) { return applicationContext.getAliases(name); } /** * <pre> * 获得请求 * </pre> * @return */ public static HttpServletRequest getHttpServletRequest() { HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()) .getRequest(); return request; } }
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原文地址:http://jianboli.blog.51cto.com/12075002/1893758