Spring RMI 笔记

一，服务器端
1.真正的业务interface

package cn.com.legendapl.spring.service;

public interface OperationService {

	public int add(int a, int b);
	
	public int sub(int a, int b);
	
	public int mul(int a, int b);
	
	public int div(int a, int b);
}

2.RMI interface
需要特别注意的是RMI interface 与真正的业务interface所定义的方法是一样的。
但是每个方法都应声明抛出异常(java.rmi.RemoteException)。

package cn.com.legendapl.spring.rmi.service;

import java.rmi.RemoteException;

public interface OperationServiceRmiInterface extends java.rmi.Remote{
	public int add(int a, int b) throws RemoteException;
	
	public int sub(int a, int b) throws RemoteException;
	
	public int mul(int a, int b) throws RemoteException;
	
	public int div(int a, int b) throws RemoteException;
}

3.ServiceImpl
业务实现必须同时实现两个接口。

package cn.com.legendapl.spring.service;

import cn.com.legendapl.spring.rmi.service.OperationServiceRmiInterface;

public class OperationServiceImpl
	implements OperationService, OperationServiceRmiInterface {

	public int add(int a, int b) {
		return a + b;
	}

	public int div(int a, int b) {
		return a / b;
	}

	public int mul(int a, int b) {
		return a * b;
	}

	public int sub(int a, int b) {
		return a - b;
	}
}

4.spring 配置文件

<beans>
	<bean id="service" class="cn.com.legendapl.spring.service.OperationServiceImpl" />

	<bean id="rmiService" class="org.springframework.remoting.rmi.RmiServiceExporter">
		<property name="service" ref="service" />
		<property name="serviceInterface" 
<!-- 这个地方的接口是实际的业务接口，不是那个继承自Remote接口的接口 -->
value="cn.com.legendapl.spring.service.OperationService" />
		<property name="serviceName" value="operation" />
		<property name="registryPort" value="8899" />
	</bean>
<beans>

5.启动服务代码
这里也有地方不甚了解，spring怎么帮我把当前线程阻塞的？下列代码中的日志是有效的，
而记录完成后，进程并不会结束。

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Start {

	public static void main(String[] args) {
		new ClassPathXmlApplicationContext("applicationContext.xml");
                LOG.debug("start...");
	}

}

二，客户端
1.配置文件

	<bean id="rmi" class="org.springframework.remoting.rmi.RmiProxyFactoryBean">
		<property name="serviceInterface" value="cn.com.legendapl.spring.service.OperationService" />
		<property name="serviceUrl" value="rmi://localhost:8899/operation" />
	</bean>

2.使用远程模块
当然了，客户端工程里也要有业务接口的定义才行的。

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.com.legendapl.spring.service.OperationService;

public class TestCase {

	@Test
	public void case1() {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		OperationService os = (OperationService) context.getBean("rmi");
		System.out.println(os.mul(12, 3));
	}
}