轉載自http://blog.csdn.net/zhu_tianwei/article/details/18082045

實現原理：通過傳遞服務bean的名稱、執行的方法及參數，通過反射機制進行調用返回。

優點：只需對外提供一個接口服務即可，只要容器中操作服務bean，通過接口即可調用，增加服務bean無需增加對外接口。

代碼如下：

接口類

[java]?view plain?copy

public?interface?ProxyService?{??

????/**?

?????*?webservice調用代理?

?????*?@param?beanName??bean或類名?

?????*?@param?functionName?調用的函數名?

?????*?@param?params?參數?

?????*?@return?

?????*?@throws?Exception?

?????*/??

????Object?proxy(String?beanName,?String?functionName,String...?params)?throws?Exception;??

}??

實現類：

服務基于spring，為了方便獲取服務bean，實現類實現spring的ApplicationContextAware接口

[java]?view plain?copy

@Service??

public?class?ProxyServiceImpl?implements?ProxyService?,ApplicationContextAware{??

??

????protected?final?Logger?logger?=?LoggerFactory.getLogger(getClass());??

??????

????@Resource??

????private?ApplicationContext?applicationContext;??

??

????@Override??

????public?void?setApplicationContext(ApplicationContext?applicationContext)?throws?BeansException?{??

????????this.applicationContext?=?applicationContext;??

????}??

??????

????/**?

?????*?通過代理執行業務方法，方法數據?

?????*/??

????@SuppressWarnings("rawtypes")??

????@Override??

????public?Object?proxy(String?beanName,?String?functionName,?String...?params)?throws?ServiceException?{??

??

?????????//參數判斷??

?????????if(StringUtils.isEmpty(beanName)){??

?????????????throw?new?Exception("error:?beanName?is?empty.");??

?????????}??

?????????if(StringUtils.isEmpty(functionName)){??

?????????????throw?new?Exception("error:?functionName?is?empty.");??

?????????}??

?????????//獲取服務bean??

?????????Object?bean?=?getBean(beanName);??

?????????if(bean?==?null){??

?????????????throw?new?Exception("error:?bean?is?not?exist.");??

?????????}??

????????if(params?==?null?||?params.length?==0){??

????????????logger.warn("proxy??params?is?empty.");??

????????}??

??????????

????????Method?method?=?null;??

????????//處理無參數調用??

????????if(params?==?null?||?params.length?==0){??

?????????????try?{??

????????????????//獲取服務bean方法??

????????????????method?=?bean.getClass().getMethod(functionName);??

????????????}?catch?(SecurityException?e)?{??

????????????????logger.error("proxy?getMethod?SecurityException:"+e.getMessage());??

????????????????e.printStackTrace();??

????????????}?catch?(Exception?e)?{??

????????????????logger.error("proxy?invoke?IllegalArgumentException:"+e.getMessage());??

????????????????e.printStackTrace();??

????????????????throw?new?Exception("error:?get?method?Exception:"+e.getMessage());??

????????????}???

????????}else{??

??????????????//處理有參數調用??

??????????????//處理調用方法參數??

??????????????Class[]?paraTypes?=?new?Class[params.length];??

??????????????for?(int?i?=?0;?i?<?paraTypes.length;?i++)?{??

????????????????paraTypes[i]?=?String.class;??

??????????????}??

????????????try?{??

????????????????//獲取服務bean方法??

????????????????method?=?bean.getClass().getMethod(functionName,?paraTypes);??

????????????}catch?(Exception?e)?{??

????????????????logger.error("proxy?invoke?IllegalArgumentException:"+e.getMessage());??

????????????????e.printStackTrace();??

????????????????throw?new?Exception("error:?get?method?Exception:"+e.getMessage());??

????????????}???

????????}??

????????if(method?==?null?){??

????????????throw?new?Exception("error:?function?is?not?exist.");??

????????}??

???????????

?????????Object?rs?=?null;??

????????try?{??

????????????//調用返回數據??

????????????rs?=?method.invoke(bean,params);??

????????}?catch?(Exception?e)?{??

????????????logger.error("proxy?invoke?IllegalArgumentException:"+e.getMessage());??

????????????e.printStackTrace();??

????????????throw?new?Exception("error:?invoke?method?Exception:"+e.getMessage());??

??????????????

????????}???

????????return?rs;??

????}??

??????

????/**?

?????*?獲取bean對象?

?????*?@param?beanName?

?????*?@return?

?????*/??

????private?Object?getBean(String?beanName){??

????????Object?bean?=?null;??

????????bean?=?applicationContext.getBean(beanName);??

????????if(bean?==?null){??

????????????try?{??

????????????????Class<?>?classe?=?Class.forName(beanName);??

????????????????bean?=?classe.newInstance();??

????????????}?catch?(InstantiationException?e)?{??

????????????????logger.error("getBean?InstantiationException:"+e.getMessage());??

????????????????e.printStackTrace();??

????????????}?catch?(IllegalAccessException?e)?{??

????????????????logger.error("getBean?IllegalAccessException:"+e.getMessage());??

????????????????e.printStackTrace();??

????????????}catch?(?ClassNotFoundException?e)?{??

????????????????logger.error("getBean?ClassNotFoundException:"+e.getMessage());??

????????????????e.printStackTrace();??

????????????}??

????????}??

????????logger.debug("getBean(),beanName:"+beanName);??

????????return?bean;??

????}??

??

}??

調用方式如下：

proxyService.proxy("testservice","say","helloword");
testservice 為spring中bean實例
say 為testservice的業務方法
helloword 為參數

以上方式可以使用與遠程調用（如webservice等），對外為的代理調用接口。只需實現一個對外接口，調用服務內部多個業務服務。

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