?PS:?在RPC遠程調用中，想要獲取自定義的service的方法，就得自定義標簽遍歷拿到方法

PS:在spring中，兩個最核心的?概念是aop和ioc，aop其實就是動態代理。?ioc?就是解決對象的創建問題。

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1.自定義標簽

package cn.itcast_04_springannotation.userdefinedannotation.annotation;import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import org.springframework.stereotype.Component;@Target({ ElementType.TYPE })//注解用在接口上 @Retention(RetentionPolicy.RUNTIME)//VM將在運行期也保留注釋，因此可以通過反射機制讀取注解的信息 @Component public @interface RpcService {String value(); }

2.實現接口中的方法

package cn.itcast_04_springannotation.userdefinedannotation.service.impl;import cn.itcast_04_springannotation.userdefinedannotation.annotation.RpcService; import cn.itcast_04_springannotation.userdefinedannotation.service.HelloService;@RpcService("HelloServicebb") public class HelloServiceImpl implements HelloService {public String hello(String name) {return "Hello! " + name;}public void test(){System.out.println("test");} }

3.主程序測試

package cn.itcast_04_springannotation.userdefinedannotation.test;import java.lang.reflect.Method; import java.util.Map;import org.springframework.beans.BeansException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.stereotype.Component;import cn.itcast_04_springannotation.userdefinedannotation.annotation.RpcService; import cn.itcast_04_springannotation.userdefinedannotation.service.HelloService;@Component //ApplicationContextAware會為Component組件調用setApplicationContext方法； 測試Myserver3時注釋 public class MyServer implements ApplicationContextAware {@SuppressWarnings("resource")public static void main(String[] args) {ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("spring2.xml");}public void setApplicationContext(ApplicationContext ctx)throws BeansException {Map<String, Object> serviceBeanMap = ctx.getBeansWithAnnotation(RpcService.class);for (Object serviceBean : serviceBeanMap.values()) {try {//獲取自定義注解上的valueString value = serviceBean.getClass().getAnnotation(RpcService.class).value();System.out.println("注解上的value: " + value);//反射被注解類，并調用指定方法Method method = serviceBean.getClass().getMethod("hello",new Class[] { String.class });Object invoke = method.invoke(serviceBean, "bbb");System.out.println(invoke);} catch (Exception e) {e.printStackTrace();}}}}

log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
注解上的value: HelloServicebb
Hello! bbb

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---------------------------------下面講解一下關于spring和junit4的測試方式

package cn.itcast_04_springannotation.userdefinedannotation.test;import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import cn.itcast_04_springannotation.userdefinedannotation.service.HelloService;@RunWith(SpringJUnit4ClassRunner.class)//加載類 @ContextConfiguration(locations = "classpath:spring2.xml")//加載文件 @Component public class MyServer3 {@AutowiredHelloService helloService;@Testpublic void helloTest1() {System.out.println("開始junit測試……");String hello = helloService.hello("ooooooo");System.out.println(hello);}}

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轉載于:https://www.cnblogs.com/bee-home/p/7851770.html

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