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  • 获取spring bean的utils

    <span style="font-size:10px;">package com.record.util;
    
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    
    import java.util.Map;
    
    /**
     * 以静态变量保存Spring ApplicationContext.
     */
    @SuppressWarnings("unchecked")
    public class SpringContextUtil implements ApplicationContextAware {
    
        private static ApplicationContext applicationContext;
    
        public static ApplicationContext getApplicationContext() {
            if (applicationContext == null)
                throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextUtil");
            return applicationContext;
        }
    
        /**
         * ApplicationContextAware接口的context注入函数.
         */
        public void setApplicationContext(ApplicationContext context) throws BeansException {
            applicationContext = context;
        }
    
        public static <T> T getBean(String name) throws BeansException {
            return (T) applicationContext.getBean(name);
        }
    
        public static <T> T getBean(Class<T> cls) {
            return getBean(cls, applicationContext);
        }
    
        public static <T> T getBean(Class<T> cls, ApplicationContext ctx) {
            Map<String, T> map = ctx.getBeansOfType(cls);
            if (map == null || map.size() == 0) {
                return null;
            }
            if (map.size() > 1) {
                new Exception("bean is not unique.").printStackTrace();
            }
            return map.values().iterator().next();
        }
    }</span>
    <span style="font-size:10px;">//对于无法获取spring容器的class 如servlet等 可以方便的获取spring容器中的bean, 配合 servlet3.0注解(如@WebServlet(urlPatterns = "/mobile/report/billExcel", asyncSupported = true))等 对原有项目可以做到完全不侵入,爽歪歪啊</span>
    
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  • 原文地址:https://www.cnblogs.com/huangpeng1990/p/4364353.html
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