暴露你的服务;在客户端,通过org.springframework.remoting.rmi.RmiProxyFactoryBean可以使用服务端暴露的服务,非常方便。这种C/S模型的访问方式,可以屏蔽掉RMI本身的复杂性,如服务端Skeleton和客户端Stub等的处理细节,这些对于服务开发和服务使用的人员来说,都是透明的,无需过度关注,而集中精力开发你的商业逻辑。

下面通过一个例子,说明如何通过Spring集成RMI。

服务端发布服务

我们定义了服务接口,服务端实现该服务接口来完成其复杂的逻辑,客户端可以通过该接口调用服务端暴露的服务,如下所示:


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


服务实现,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) {  
new StringBuffer().append("Your mobile number is /"").append(  
"/", protocol type is /"").append(protocol)  
"/".");  
"Message is: " + sb.toString());  
return sb.toString();  
    }  
}


服务端发布服务,供客户端进行(远程方法)调用,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,指定了暴露的服务的名称,通过serviceName属性注入到RmiServiceExporter中,服务名称为MobileAccountService,客户端通过该服务名称就能够进行调用。

下面启动服务端,发布服务,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");  
          
new Object();  
synchronized (lock) {  
            lock.wait();  
        }  
    }  
}


 

客户端调用服务

客户端配置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,将一个serviceUrl和serviceInterface注入给RmiProxyFactoryBean,即可进行远程方法调用。调用示例如下所示:



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) {  
new ClassPathXmlApplicationContext(  
"org/shirdrn/spring/remote/rmi/client.xml");  
        AccountService accountService = (AccountService) ctx  
"mobileAccountService");  
"13800138000", (byte) 5);  
        LOG.info(result);  
    }  
  
}


可见,实现远程访问变得非常容易。

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