RMI远程调用的跨平台使用Demo

最近项目中用到了RMI 粗略的学习了一下，写了一个跨平台远程调用的demo，供初学者参考！

声明远程调用接口，接口要继承Remote，并且每个接口方法都要抛出RemoteException异常，代码如下：

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface IRMITest extends Remote {
    public String sayHello (String name) throws RemoteException ;
}

接口方法的实现：

import java.net.MalformedURLException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

import com.rmi.inf.IRMITest;

@SuppressWarnings("serial")
public class RMITestImpl extends UnicastRemoteObject implements IRMITest {
	
	public RMITestImpl() throws RemoteException{
		
	}

	@Override
	public String sayHello(String name) throws RemoteException {
		System.out.println("test()方法被远程调用:   hello ," + name);
		return "hello," + name + "-------successful";
	}
}

将实现接口生成的stub的文件和接口打成jar包，供客户端使用

服务器端：

import java.net.MalformedURLException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class RMIServer {

	public static void main(String[] args) throws MalformedURLException {

		try {
			System.setProperty("java.rmi.server.hostname", "192.168.1.159");
			String rootpath= Thread.currentThread().getContextClassLoader().getResource("").toString();
			System.setProperty("java.rmi.server.codebase", rootpath);

			Registry registry = LocateRegistry.createRegistry(5858); 
			
			RMITestImpl testImpl = new RMITestImpl();
			registry.rebind("hello", testImpl);
			
			System.out.println("server is ready");
		} catch (RemoteException e) {
			e.printStackTrace();
		}
	}
}

客户端：

public class RMITestClient {

	public static void main(String[] args) {
		try {
			//在客户端加载策略文件
	        System.setProperty ("java.security.policy", "security.policy");
	        System.setSecurityManager(new RMISecurityManager());
			IRMITest test = (IRMITest)Naming.lookup("rmi://192.168.1.159:5858/hello");
			System.out.println("调用远程方法:" + test.sayHello("world"));
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (RemoteException e) {
			e.printStackTrace();
		} catch (NotBoundException e) {
			e.printStackTrace();
		}
		
	}
}

策略文件

grant {
	permission java.net.SocketPermission "*:1099-65535", "connect,accept,resolve";
};