先给大家介绍一种拦截方式:拦截类型的拦截器。故名思议:比如我想拦截所有com.xx.xx.ConsumerBean,要是单独拦截某些beanId会显的很笨重,那么提供一种拦截器,拦截类型。代码如下:
/** * Created by IntelliJ IDEA. * User: guzhen.cg * Date: 13-4-10 * Time: 下午3:15 * To change this template use File | Settings | File Templates. */ import java.lang.reflect.AccessibleObject; import java.lang.reflect.Field; import java.util.*; import java.util.concurrent.ConcurrentHashMap; import org.springframework.aop.TargetSource; import org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator; import org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.FactoryBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.util.Assert; import org.springframework.util.PatternMatchUtils; import org.springframework.web.context.ContextLoader; import org.springframework.web.context.ContextLoaderListener; /** * 类BeanTypeAutoProxyCreator.java的实现描述:使用配置类型代替Springframework中配置名称的实现 * * @author guzhen.cg 2013-04-18 晚上11:40 */ public class BeanTypeAutoProxyCreator extends BeanNameAutoProxyCreator implements InitializingBean, ApplicationContextAware { private static final long serialVersionUID = -9094985530794052264L; private Class<?> targetBeanType; private ApplicationContext context; /** * @param targetClass the targetClass to set */ public void setTargetBeanType(Class<?> targetClass) { this.targetBeanType = targetClass; } public void setApplicationContext(ApplicationContext context) { this.context = context; } /** * Return if the given bean name matches the mapped name. * <p> * The default implementation checks for "xxx*", "*xxx" and "*xxx*" matches, as well as direct equality. Can be * overridden in subclasses. * * @param beanName the bean name to check * @param mappedName the name in the configured list of names * @return if the names match * @see org.springframework.util.PatternMatchUtils#simpleMatch(String, String) */ protected boolean isMatch(String beanName, String mappedName) { return PatternMatchUtils.simpleMatch(mappedName, beanName); } public void afterPropertiesSet() throws Exception { Assert.notNull(targetBeanType, "targetType cannot be null"); String[] beanNames =context.getBeanNamesForType(targetBeanType, true, false); // String[] beanNames = context.getBeanNamesForType(targetBeanType); //太坑爹,不要初始化bean if (beanNames == null) { logger.warn("can not found suit bean by " + targetBeanType ); return ; } String[] result = new String[beanNames.length]; for (int i = 0; i < beanNames.length; i++) { result[i] = beanNames[i].substring(1); //截取第一个字符& } super.setBeanNames(result); } }
这个拦截器很简单,继承beanname自动拦截器,实现了ApplicationContextAware接口,获得程序中的context。这时走了一个很大的弯路,通过context获取需要拦截的beanID时,如果第三个参数allowEagerInit(渴望初始化)用默认值:true,则此时会去初始化部分bean,造成程序中出现其他拦截器失效的问题。