使用Spring RMI调用远程方法

Spring有多种调用远程的方式，今天学习了一下远程方法调用（RMI）。

RMI需要服务端和客户端

我们先从服务器开始

我的代码结构

package rmi;

public interface ServerRmiI {

	public String sayHi(String name);
}

package rmi;

public class ServerRmiImpl implements ServerRmiI{

	 public String sayHi(String name) {
	  return "Hi,"+name;
	 }

}

package rmi;

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

public class Testrun {

	/**
	 * <p>
	 * </p>
	 * @author zhangjunshuai
	 * @date 2014-5-28 下午5:06:06
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext-bean.xml");
        context.getBean("serverTest"); 
	}

}

配置：

<?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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context 
 http://www.springframework.org/schema/context/spring-context-2.5.xsd"
    default-autowire="byName" default-lazy-init="true">   
     <bean name="rmiserver" class="rmi.ServerRmiImpl"/>
     <bean name="serverTest" class="org.springframework.remoting.rmi.RmiServiceExporter">
       <property name="service" ref="rmiserver"/>
       <property name="serviceName" value="serverRmiTest"/>
       <property name="serviceInterface" value="rmi.ServerRmiI"/>
       <property name="registryPort" value="1021"/>
     </bean>
</beans>

说明：service本地实现，serviceName对外提供的名称对外提供的名称，registyPort开启端口

客户端：

代码结构

首先要定义对应接口

package client;

public interface ServerRmiI {

	public String sayHi(String name);
}

测试方法

package client;

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

public class TestRun {

	public static void main(String[] args) {
		  ApplicationContext context = new ClassPathXmlApplicationContext("classpath:/config/applicationContext-rmi-client.xml");
		        ServerRmiI rmiI = (ServerRmiI) context.getBean("clentrmi");
		        System.out.println(rmiI.sayHi("rmi"));
		 }
}

配置文件

<?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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context 
 http://www.springframework.org/schema/context/spring-context-2.5.xsd"
    default-autowire="byName" default-lazy-init="true">   
     <bean name="clentrmi" class="org.springframework.remoting.rmi.RmiProxyFactoryBean">
     <property name="serviceUrl" value="rmi://127.0.0.1:1021/serverRmiTest"/>
     <property name="serviceInterface" value="client.ServerRmiI"/>
     </bean>
</beans>

后台成功输出“hi”说明执行成功

需要注意：

1、RMI是很难穿越防火墙的；

2、RMI是基于Java的，这意味着客户端和服务端必须都是采用Java开发的；

3、因为RMI使用了Java的序列化机制，所以通过网络传输的对象类型必须保证在调用的两端是相同的版本。

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参考：

《Spring事件（第3版）》

《Spring高级程序设计》

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