获取Spring加载的实例bean/获取注解Beam

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1，编写工具类

package com.cfwx.rox.web.business.essence.util;import java.util.HashMap;import java.util.Map;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;/** * 获取spring的注入bean 工具类 * @author JSW * */public class SpringContextUtil implements ApplicationContextAware{        private static  ApplicationContext context = null;        @Override    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException    {        context = applicationContext;    }        /**     * 获取在*.xml文件中有注入的bean     * @param beanName     * @return     */    @SuppressWarnings("unchecked")    public static <T> T getBean(String beanName){        return (T) context.getBean(beanName);    }    /**     * 获取到的类的实例对象     */    private Map<String, Object> classInstances;        /**     * 获取到的类的实例对象 指定spring注解的类对象     */    public Map<String, Object> getClassInstances() {        if(this.classInstances == null){            init();        }        return this.classInstances;    }                @SuppressWarnings("static-access")    public void init(){        if(this.context == null){            return;        }        if(this.classInstances == null){            this.classInstances = new HashMap<String,Object>();        }                Map<String, Object> beansWithAnnotationMap = this.context.getBeansWithAnnotation(org.springframework.stereotype.Service.class);                Class<? extends Object> clazz = null;        for(Map.Entry<String, Object> entry : beansWithAnnotationMap.entrySet()){            clazz = entry.getValue().getClass();//获取到实例对象的class信息            Class<? extends Object>  [] interfaces = clazz.getInterfaces();            for(Class<? extends Object>  aInterface : interfaces){                //接口实例名(只是将接口的首字母换成小写)                String aInterfaceSimpleName = getDefaultInstanceName(aInterface);                classInstances.put(aInterfaceSimpleName, entry.getValue());            }        }    }        /**     * 根据这个类来获取默认的实例名（默认：将首字母换成小写）     * @param clazz  类信息     * @return 默认的实例名     */    public static String getDefaultInstanceName(Class<?> clazz) {        if (clazz == null) {            return null;        }        String className = clazz.getSimpleName();        String firsrLowerChar = className.substring(0, 1).toLowerCase();        className = firsrLowerChar + className.substring(1);        return className;    }            }

2， application.xml中注入

    <bean id="springContextUtil" class="com.cfwx.rox.web.business.essence.util.SpringContextUtil"></bean>

3， web.xml中配置监听

<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

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