package com.whyc.config;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletContextEvent;
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import javax.servlet.ServletContextListener;
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import javax.servlet.annotation.WebListener;
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import org.springframework.beans.BeansException;
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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 org.springframework.util.Assert;
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/**
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* @author ypp 创建时间：2018年10月17日 上午11:59:11
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* @Description: TODO(用一句话描述该文件做什么)
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*/
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@Component
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@WebListener
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public class SpringBeanTool implements ApplicationContextAware, ServletContextListener {
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/**
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* 上下文对象实例
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*/
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private ApplicationContext applicationContext;
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private ServletContext servletContext;
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@Override
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public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
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this.applicationContext = applicationContext;
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}
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/**
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* 获取applicationContext
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*
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* @return
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*/
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public ApplicationContext getApplicationContext() {
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return applicationContext;
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}
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/**
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* 获取servletContext
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*
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* @return
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*/
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public ServletContext getServletContext() {
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return servletContext;
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}
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/**
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* 通过name获取 Bean.
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*
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* @param name
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* @return
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*/
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public Object getBean(String name) {
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return getApplicationContext().getBean(name);
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}
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/**
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* 通过class获取Bean.
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*
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* @param clazz
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* @param <T>
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* @return
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*/
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public <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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* 通过name,以及Clazz返回指定的Bean
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*
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* @param name
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* @param clazz
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* @param <T>
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* @return
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*/
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public <T> T getBean(String name, Class<T> clazz) {
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Assert.hasText(name, "name为空");
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return getApplicationContext().getBean(name, clazz);
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}
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@Override
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public void contextInitialized(ServletContextEvent sce) {
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this.servletContext = sce.getServletContext();
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}
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@Override
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public void contextDestroyed(ServletContextEvent sce) {
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}
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}
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