首页 > 应用开发 > IT综合 > Spring中集成RMI(远程方法调用)
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
首先看下实例程序目录结构:
Spring中发布RMI服务(ZLv_RMIServerWithSpring):
(1) 定义接口MessageProvider及接口中供调用的方法(MessageProvider.java):
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package org.thera.rmi.service;
public interface MessageProvider {
public String queryForMessage(String name);
}
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(2) 实现MessageProvider接口(MessageProviderImpl.java):
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package org.thera.rmi.service;
public class MessageProviderImpl implements MessageProvider {
@Override
public String queryForMessage(String name) {
return "Hello, " + name;
}
}
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做好了上述准备,下面我们就可以通过Spring中集成RMI,方便的发布RMI服务端
(3) Spring配置文件作如下配置(context.xml):
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 注入要发布的RMI服务类 -->
<bean id="messageService" class="org.thera.rmi.service.MessageProviderImpl"></bean>
<bean class="org.springframework.remoting.rmi.RmiServiceExporter">
<!-- RMI服务名称,可自定义服务名称 -->
<property name="serviceName" value="MessageService" />
<!-- 导出实体 -->
<property name="service" ref="messageService" />
<!-- 导出接口 -->
<property name="serviceInterface" value="org.thera.rmi.service.MessageProvider" />
<!-- spring默认使用1099端口 -->
<property name="registryPort" value="1199" />
</bean>
</beans>
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(4) 加载Spring容器,发布RMI服务(Main.java):
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package org.thera.rmi.service.main;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new FileSystemXmlApplicationContext("conf/context.xml");
System.out.println("已成功发布RMI服务类");
}
}
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到这里,RMI的服务端已经发布成功,运行结果如下截图:
Spring中客户端调用RMI服务(ZLv_RMIClientWithSpring):
(1) 移植服务端服务接口文件MessageProvider.java;
(2) Spring配置文件做如下配置:
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="messageService" class="org.springframework.remoting.rmi.RmiProxyFactoryBean">
<property name="serviceUrl" value="rmi://192.168.1.100:1199/MessageService" />
<property name="serviceInterface" value="org.thera.rmi.service.MessageProvider" />
</bean>
</beans>
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(3) 加载Spring容器,调用RMI服务端(Main.java):
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package org.thera.rmi.service.main;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.thera.rmi.service.MessageProvider;
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new FileSystemXmlApplicationContext("conf/context.xml");
System.out.println("加载Spring容器,并初始化RMI客户端");
MessageProvider client = (MessageProvider)ctx.getBean("messageService");
String temp = client.queryForMessage("LvSantorini");
System.out.println("返回结果: " + temp);
}
}
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运行Main.java,结果如下图:
到这里我们就已经介绍完Spring中集成RMI的发布和调用方式了,怎么样?相比原始方法简单了不少吧,接口文件如此简单,之前的实现java.rmi.Remote接口,每个方法还要抛出java.rmi.RemoteException都不需要写了。
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