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》
客户端：