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BeanPostProcessor使用心得
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最近想對項目中的所有bean進行一個代理。然后監控bean得方法的使用情況。
剛開始想的方法是：重寫項目的beanFactory，然后再getBean的使用，對結果object進行一個代理，達到我的目的。但是發現重寫getBean的方法，無法對bean中的依賴注入的bean(set進來的bean)進行代理。 正好看到了beanPostProcessor的使用方法。可以在spring的xml的配置一個BeanPostProcessor，然后對所有的bean進行一個代理處理，正好可以滿足我的需求！ BeanPostProcessor代碼如下： Java代碼??
import?java.lang.reflect.Proxy;??import?java.util.Map;??import?java.util.concurrent.ConcurrentHashMap;????import?org.springframework.beans.BeansException;??import?org.springframework.beans.factory.config.BeanPostProcessor;????import?com.alibaba.common.logging.Logger;??import?com.alibaba.common.logging.LoggerFactory;????public?class?MyBeanPostProcesser?implements?BeanPostProcessor?{??????private?Map?map?=?new?ConcurrentHashMap(100);??????private?static?final?Logger?log?=?LoggerFactory.getLogger("myBeanPostProcesser");????????public?Object?postProcessAfterInitialization(Object?bean,?String?beanName)?throws?BeansException?{??????????MyProxy?proxy?=?new?MyProxy();????????????if?(beanName.contains("DB"))?{??????????????return?bean;??????????}????????????if?(bean.toString().contains("Proxy"))?{??????????????log.info(beanName?+?"為代理類,不進行再次代理!");??????????????return?bean;??????????}??????????if?(beanName.contains("TransactionTemplate"))?{??????????????log.info(beanName?+?"為TransactionTemplate類,不進行再次代理!該類為:"?+?bean);??????????????return?bean;??????????}????????????if?(map.get(beanName)?!=?null)?{??????????????log.info(beanName?+?"已經代理過,不進行再次代理!");??????????????return?map.get(beanName);??????????}??????????proxy.setObj(bean);??????????proxy.setName(beanName);??????????Class[]?iterClass?=?bean.getClass().getInterfaces();??????????if?(iterClass.length?>?0)?{??????????????Object?proxyO?=?Proxy.newProxyInstance(bean.getClass().getClassLoader(),?iterClass,?proxy);??????????????map.put(beanName,?proxyO);??????????????return?proxyO;??????????}?else?{??????????????log.info(beanName?+?"么有接口不進行代理!");??????????????return?bean;??????????}??????}????????public?Object?postProcessBeforeInitialization(Object?bean,?String?beanName)?throws?BeansException?{??????????return?bean;??????}????}?? ? 代理類Proxy代碼如下： Java代碼??
import?java.lang.reflect.InvocationHandler;??import?java.lang.reflect.Method;????import?com.alibaba.common.logging.Logger;??import?com.alibaba.common.logging.LoggerFactory;????import?sun.reflect.Reflection;????public?class?MyProxy?implements?InvocationHandler?{??????private?static?final?Logger?log?=?LoggerFactory.getLogger("myself");????????private?Object?obj;????????private?String?name;????????public?String?getName()?{??????????return?name;??????}????????public?void?setName(String?name)?{??????????this.name?=?name;??????}????????public?Object?getObj()?{??????????return?obj;??????}????????public?void?setObj(Object?obj)?{??????????this.obj?=?obj;??????}????????public?Object?invoke(Object?proxy,?Method?method,?Object[]?args)?throws?Throwable?{??????????System.out.println("begin================"?+?"bean?名稱為【"?+?name?+?"】方法為【"?+?method.getName()?+?"】========="??????????????????+?obj.getClass());??????????log.error("begin================"?+?"bean?名稱為【"?+?name?+?"】方法為【"?+?method.getName()?+?"】========="??????????????????+?obj.getClass());??????????return?method.invoke(obj,?args);??????}????????public?void?printDetail(String?detail)?{??????????log.error(detail);??????}????}?? ? 感覺還是比較好使的！記錄一下。以后再有監控的需求，可以考慮使用這種方式了！
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