spring集成RMI

使用Spring對RMI的支持,可以非常容易地構建你的分佈式應用。在服務端,可以通過Spring的org.springframework.remoting.rmi.RmiServiceExporter可以暴露你的服務;在客戶端,通過org.springframework.remoting.rmi.RmiProxyFactoryBean可以使用服務端暴露的服務,非常方便。這種C/S模型的訪問方式,可以屏蔽掉RMI本身的複雜性,如服務端Skeleton和客戶端Stub等的處理細節,這些對於服務開發和服務使用的人員來說,都是透明的,無需過度關注,而集中精力開發你的商業邏輯。

下面通過一個例子,說明如何通過Spring集成RMI。

服務端發佈服務

我們定義了服務接口,服務端實現該服務接口來完成其複雜的邏輯,客戶端可以通過該接口調用服務端暴露的服務,如下所示:

    package org.shirdrn.spring.remote.rmi;  
      
    public interface AccountService {  
        int queryBalance(String mobileNo);  
        String shoopingPayment(String mobileNo, byte protocol);  
    }  

服務實現,示例如下所示:

    package org.shirdrn.spring.remote.rmi;  
      
    import org.apache.log4j.Logger;  
      
    public class MobileAccountServiceImpl implements AccountService {  
      
        private static final Logger LOG = Logger.getLogger(MobileAccountServiceImpl.class);  
        public int queryBalance(String mobileNo) {  
            if (mobileNo != null)  
                return 100;  
            return 0;  
        }  
      
        public String shoopingPayment(String mobileNo, byte protocol) {  
            StringBuffer sb = new StringBuffer().append("Your mobile number is /"").append(  
                    mobileNo).append("/", protocol type is /"").append(protocol)  
                    .append("/".");  
            LOG.info("Message is: " + sb.toString());  
            return sb.toString();  
        }  
    }  

服務端發佈服務,供客戶端進行(遠程方法)調用,Spring配置server.xml如下所示:

    <?xml version="1.0" encoding="UTF-8"?>  
    <beans xmlns="http://www.springframework.org/schema/beans"  
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">  
      
        <bean id="serviceExporter" class="org.springframework.remoting.rmi.RmiServiceExporter">  
            <property name="serviceName" value="MobileAccountService" />  
            <property name="service" ref="accountService" />  
            <property name="serviceInterface"  
                value="org.shirdrn.spring.remote.rmi.AccountService" />  
            <property name="registryPort" value="8080" />  
            <property name="servicePort" value="8088" />  
        </bean>  
      
        <bean id="accountService" class="org.shirdrn.spring.remote.rmi.MobileAccountServiceImpl" />  
      
    </beans>  

上面配置,指定了暴露的服務的名稱,通過serviceName屬性注入到RmiServiceExporter中,服務名稱爲MobileAccountService,客戶端通過該服務名稱就能夠進行調用。

下面啓動服務端,發佈服務,如下所示:

    package org.shirdrn.spring.remote.rmi;  
      
    import org.springframework.context.support.ClassPathXmlApplicationContext;  
      
    public class RmiServer {  
      
        public static void main(String[] args) throws InterruptedException {  
            new ClassPathXmlApplicationContext("org/shirdrn/spring/remote/rmi/server.xml");  
              
            Object lock = new Object();  
            synchronized (lock) {  
                lock.wait();  
            }  
        }  
    }  

客戶端調用服務

客戶端配置client.xml如下所示:

    <?xml version="1.0" encoding="UTF-8"?>  
    <beans xmlns="http://www.springframework.org/schema/beans"  
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">  
      
        <bean id="mobileAccountService" class="org.springframework.remoting.rmi.RmiProxyFactoryBean">  
            <property name="serviceUrl" value="rmi://192.168.1.103:8080/MobileAccountService" />  
            <property name="serviceInterface"  
                value="org.shirdrn.spring.remote.rmi.AccountService" />  
        </bean>  
      
    </beans>  


配置中,將一個serviceUrl和serviceInterface注入給RmiProxyFactoryBean,即可進行遠程方法調用。調用示例如下所示:

    package org.shirdrn.spring.remote.rmi;  
      
    import org.apache.log4j.Logger;  
    import org.springframework.context.ApplicationContext;  
    import org.springframework.context.support.ClassPathXmlApplicationContext;  
      
    public class RmiClient {  
      
        private static final Logger LOG = Logger.getLogger(RmiClient.class);  
          
        public static void main(String[] args) {  
            ApplicationContext ctx = new ClassPathXmlApplicationContext(  
                    "org/shirdrn/spring/remote/rmi/client.xml");  
            AccountService accountService = (AccountService) ctx  
                    .getBean("mobileAccountService");  
            String result = accountService.shoopingPayment("13800138000", (byte) 5);  
            LOG.info(result);  
        }  
      
    }  


轉載:http://blog.csdn.net/shirdrn/article/details/6359254


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