spring整合RMI实现Java远程方法调用

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。

1.服务端接口：

接口1

/** * server端接口  * @author wwh * */public interface HelloRMIService {    public int getAdd(int a, int b);    public User getUser();}

接口2

/** * Server端接口 * @author wwh */public interface ICalculateRMIService {    public int mul(int a, int b);    public int get();    public void setAvalue(int avalue);    public void setBvalue(int bvalue);}

2.服务端接口实现：

实现接口1

public class HelloRMIServiceImpl implements HelloRMIService {    @Override    public int getAdd(int a, int b) {        return a + b;    }    @Override    public User getUser() {        User user = new User();        user.setAge(18);        user.setEmail("[e-mail]");        user.setName("xiaohuihui");        return user;    }}

实现接口2

public class CalculateRMIServiceImpl implements ICalculateRMIService {    private int avalue = 0, bvalue = 0;    @Override    public int mul(int a, int b) {        return a * b;    }    public int get() {        return avalue*bvalue;    }    public int getAvalue() {        return avalue;    }    public void setAvalue(int avalue) {        this.avalue = avalue;    }    public int getBvalue() {        return bvalue;    }    public void setBvalue(int bvalue) {        this.bvalue = bvalue;    }}

3.服务端配置文件 rmiServer.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:jee="http://www.springframework.org/schema/jee"        xmlns:tx="http://www.springframework.org/schema/tx"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd          http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">    <bean id="helloRMIServiceImpl" class="com.rmi.test.spring.HelloRMIServiceImpl"> </bean>    <!-- 将一个类发布为一个RMI服务 -->    <bean id="myRMIServer"  class="org.springframework.remoting.rmi.RmiServiceExporter">     <!-- 服务名， 在client端serviceUrl中 -->      <property name="serviceName" value="helloRMI"></property>       <!-- 被暴露的服务类 -->      <property name="service" ref="helloRMIServiceImpl"></property>       <!-- 服务的接口, 在client端也有 -->      <property name="serviceInterface" value="com.rmi.test.spring.HelloRMIService"></property>       <!-- 服务的端口 -->      <property name="registryPort" value="9999"></property>    </bean>    <bean id="calculateRMIServiceImpl" class="com.rmi.test.spring.CalculateRMIServiceImpl"> </bean>     <!-- 将一个类发布为一个RMI服务 -->    <bean id="ICalculateRMIService"  class="org.springframework.remoting.rmi.RmiServiceExporter">       <!-- 被暴露的服务类 -->      <property name="service" ref="calculateRMIServiceImpl"></property>      <!-- 服务名， 在client端serviceUrl中 -->      <property name="serviceName" value="calculate"></property>      <!-- 服务的接口, 在client端也有 -->      <property name="serviceInterface" value="com.rmi.test.spring.ICalculateRMIService"></property>      <!-- 服务的端口 -->      <property name="registryPort" value="9999"></property>      <!-- 其他的属性自己查看  RmiServiceExporter类-->    </bean></beans>

4.服务端发布服务：RMIServiceTest.java

import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * 服务端发布服务功能， 供远程调用 * @author Administrator */public class RMIServiceTest {    public static void main(String[] args) {        ApplicationContext applicationContext =  new ClassPathXmlApplicationContext("rmiServer.xml");        ICalculateRMIService iCalculateRMIService = applicationContext.getBean("calculateRMIServiceImpl", ICalculateRMIService.class);        iCalculateRMIService.setAvalue(4);        iCalculateRMIService.setBvalue(5);        System.out.println(iCalculateRMIService.get());        System.out.println("server发布服务成功！");    }}

5.客户端接口：（和服务端一样）

接口1

/** * server端接口  * @author wwh * */public interface HelloRMIService {    public int getAdd(int a, int b);    public User getUser();}

接口2

/** * Server端接口 * @author wwh */public interface ICalculateRMIService {    public int mul(int a, int b);    public int get();    public void setAvalue(int avalue);    public void setBvalue(int bvalue);}

6.客户端配置文件：rmiClient.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:jee="http://www.springframework.org/schema/jee"        xmlns:tx="http://www.springframework.org/schema/tx"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd          http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">    <!-- 客户端 -->    <bean id="myRMIClient"  class="org.springframework.remoting.rmi.RmiProxyFactoryBean">          <property name="serviceInterface" value="com.rmi.test.spring.HelloRMIService"></property>          <property name="serviceUrl" value="rmi://127.0.0.1:9999/helloRMI"></property>    </bean>      <bean id="calculate"  class="org.springframework.remoting.rmi.RmiProxyFactoryBean">          <property name="serviceInterface" value="com.rmi.test.spring.ICalculateRMIService"></property>          <property name="serviceUrl" value="rmi://127.0.0.1:9999/calculate"></property>      </bean></beans>

7.客户端测试程序：RMIClient.java

import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * 远程client测试接口 * @author wwh */public class RMIClient {    public static void main(String[] args) {        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("rmiClient.xml");        HelloRMIService helloRMIService = applicationContext.getBean("myRMIClient", HelloRMIService.class);        System.out.println("client:");        System.out.println("加法接口:        " + helloRMIService.getAdd(3, 5));        System.out.println("输出User接口:  " + helloRMIService.getUser());        System.out.println("测试ICalculateRMIService接口:   ");        ICalculateRMIService calculateRMIService = applicationContext.getBean("calculate", ICalculateRMIService.class);        System.out.println("调用乘法接口：" + calculateRMIService.mul(5, 5));        System.out.println("get接口：       " + calculateRMIService.get());    }}

RMI Without Spring

定义IHello 接口

import java.rmi.Remote;import java.rmi.RemoteException;public interface IHello extends Remote{    public String sayHello(String name) throws RemoteException;    public int sum(int a, int b) throws RemoteException;}

实现IHello接口

import java.rmi.RemoteException;import java.rmi.server.UnicastRemoteObject;public class HelloImpl extends UnicastRemoteObject implements IHello{    protected HelloImpl() throws RemoteException {        super();    }    private static final long serialVersionUID = 1L;    @Override    public String sayHello(String name) {        return "Hello, " + name;    }    @Override    public int sum(int a, int b) {        return a+b;    }}

服务端开启服务

import java.net.MalformedURLException;import java.rmi.AlreadyBoundException;import java.rmi.Naming;import java.rmi.RemoteException;import java.rmi.registry.LocateRegistry;public class HelloServer {    public static void main(String[] args) {        try {            IHello rhello = new HelloImpl();            LocateRegistry.createRegistry(8888);            Naming.bind("rmi://127.0.0.1:8888/RHello", rhello);            System.out.println(">>INFO:远程IHello对象绑定成功！");        } catch (RemoteException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (MalformedURLException e) {            System.out.println("发生URL异常");            e.printStackTrace();        } catch (AlreadyBoundException e) {            System.out.println("发生重复绑定对象异常！");            e.printStackTrace();        }    }}

客户端远程访问

import java.net.MalformedURLException;import java.rmi.Naming;import java.rmi.NotBoundException;import java.rmi.RemoteException;public class HelloClient {    public static void main(String[] args) {        try {            IHello rhello = (IHello) Naming.lookup("rmi://127.0.0.1:8888/RHello");            System.out.println(rhello.sayHello("world"));            System.out.println(rhello.sum(12, 120));        } catch (MalformedURLException | RemoteException | NotBoundException e) {            e.printStackTrace();        }    }}

参考链接1
参考链接2