1.使用場(chǎng)景

控制層調(diào)用業(yè)務(wù)層時(shí)，控制層需要拿到業(yè)務(wù)層在spring容器中注入的對(duì)象

2.代碼實(shí)現(xiàn)

import org.apache.struts2.ServletActionContext;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;

/** * 從spring容器中獲取注入的bean對(duì)象 * @explain 必須獲取到ServletContext對(duì)象，Controller層以struts2為例 * @author Marydon * @creationTime 2018年6月1日上午10:06:49 * @version 1.0 * @since * @email marydon20170307@163.com */public final class BeansUtils { private static final Logger logger = LoggerFactory.getLogger(BeansUtils.class); private static ApplicationContext ctx; private static WebApplicationContext webCtx; // 靜態(tài)代碼塊：加載該類時(shí)會(huì)被運(yùn)行的代碼 static { if (ctx == null) { try {// 入?yún)⑿枰玫絊ervletContext對(duì)象webCtx = WebApplicationContextUtils .getRequiredWebApplicationContext(ServletActionContext.getServletContext());logger.info('從web.xml容器中加載spring-config.xml'); } catch (Exception e) {logger.info('直接加載spring-config.xml'); } if (webCtx == null)// 你可以自定義spring配置文件的文件名ctx = new ClassPathXmlApplicationContext('spring-config.xml'); } } /** * 通過(guò)beanID獲取bean實(shí)例 * * @param beanID * bean的代碼 * @return 返回對(duì)應(yīng)的實(shí)例 * @throws RuntimeException * bean沒(méi)有定義 */ public static Object getBeanInstance(String beanID) throws RuntimeException { logger.info('在spring容器中獲取Bean對(duì)象 ID=' + beanID); Object obj; if (BeansUtils.ctx == null) { if (BeansUtils.webCtx.containsBeanDefinition(beanID)) {obj = BeansUtils.webCtx.getBean(beanID); } else {logger.info('beanID=' + beanID + '沒(méi)有定義');throw new RuntimeException(beanID + '沒(méi)有定義!'); } } else { if (BeansUtils.ctx.containsBeanDefinition(beanID)) {obj = BeansUtils.ctx.getBean(beanID); } else {logger.info('beanID=' + beanID + '沒(méi)有定義');throw new RuntimeException(beanID + '沒(méi)有定義!'); } } return obj; }}

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