使用spring对RMI的支持,可以非常容易地构建你的分布式应用。在服务端,可以通过Spring的org.springframework.remoting.rmi.RmiServiceExporter可以暴露你的服务;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:
[java] view plain copy package org.shirdrn.spring.remote.rmi; public interface AccountService { int queryBalance(String mobileNo); String shoopingPayment(String mobileNo, byte protocol); }
服务实现,示例如下所示:
[java] view plain copy 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:
[xhtml] view plain copy <?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:
[java] view plain copy 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(); } } }
客户端调用服务
客户端配置client.xml如下所示:
[xhtml] view plain copy <?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:
[java] view plain copy 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); } }
可见,实现远程访问变得非常容易。
转载于:https://www.cnblogs.com/kms1989/p/6515391.html
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