spring實現遠程方法調用

spring in action一書的讀書筆記

使用spring實現遠程方法調用能夠極大簡化開發

將一個spring bean包裝成爲RMI service

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1. <bean class="org.springframework.remoting.rmi.RmiServiceExporter"  
2.     p:service-ref="spitterService"  
3.     p:serviceName="SpitterService"  
4.     p:serviceInterface="com.habuma.spitter.service.SpitterService"  
5.     p:registryHost="rmi.spitter.com"  
6.     p:registryPort="1199"/>  

調用發佈的RMI service

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1. String serviceUrl = "rmi:/spitter/SpitterService";  
2. SpitterService spitterService = (SpitterService)Naming.lookup(serviceUrl);  

咱們也能夠使用spring進行配置

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1. <bean id="spitterService" class="org.springframework.remoting.rmi.RmiProxyFactoryBean" p:serviceUrl="rmi://localhost/SpitterService"  
2. p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  

RMI有一個限制就是對防火牆不太友好，不容易穿過防火牆，這在局域網能夠不用考慮，可是廣域網就須要考慮這一點

Hessian,Burlap是Caucho科技提供的兩種方法

Hessian基於二進制消息進行通訊

Burlap基於xml格式消息進行通訊

發佈Hessian service

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1. <bean id="hessianSpitterService" class="org.springframework.remoting.caucho.HessianServiceExporter"  
2.     p:service-ref="spitterService"  
3.     p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  

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1. HessianServiceExporter在spring中是做爲一個controller存在的，因此須要在web.xml(意味着必須是web項目)配置DispatcherServlet，將對Hessian service bean的請求映射到hessianSpitterService  
2. <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">  
3.     <property name="mappings">  
4.         <value>  
5.             /spitter.service=hessianSpitterService  
6.         </value>  
7.     </property>  
8. </bean>  

調用發佈的Hessian service

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1. <bean id="spitterService" class="org.springframework.remoting.caucho.HessianProxyFactoryBean"  
2.     p:serviceUrl="http://localhost:8080/Spitter/spitter.service"  
3.     p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  

發佈Burlap service

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1. <bean id="burlapSpitterService" class="org.springframework.remoting.caucho.BurlapServiceExporter"  
2.     p:service-ref="spitterService"  
3.     p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  

調用 Burlap service

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1. <bean id="spitterService" class="org.springframework.remoting.caucho.BurlapProxyFactoryBean"  
2.     p:serviceUrl="http://localhost:8080/Spitter/spitter.service"  
3.     p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  

RMI使用jdk中的類庫，可是對防火牆不太友好，burlap和hessian對防火牆友好可是使用了第三方的類庫,Spring's HttpInvoker解決了這兩個矛盾。使用spring's httpInvoker雙發必須都是用spring

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1. <bean class="org.spring.framework.remoting.httpinvoker.HttpInvokerServiceExporter"  
2.     p:service-ref="spitterService"  
3.     p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  
4. HttpInvokerServiceExporter在spring中也是做爲一個controller  
5.   
6. 調用HttpInvoker service  
7. <bean id="spitterService" class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean"  
8.     p:serviceUrl="http://localhost:8080/Spitter/spitter.service"  
9.     p:serviceInterface="com.habuma.spitter.service.SpitterService"/>  

幾種方式使用方法大致相同，只是使用的spring中的類不一樣