RMI

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#exception #service #class #initialization #methods #object

1、RMI概念

Distributed Computing is known as exchange message among many machines on the network.Except RMI ,there are other distributed computing techenologies ,such as CORBO(Common Object Request Broker),RPC.

RMI enables one JVM to invoke objects methods that will run on another JVM located elsewhere on the network.

package com.citibank.aimy.Example.client; import java.rmi.Remote; import java.rmi.RemoteException; public interface LocalServiceInterface extends Remote { public double add(double a1,double a2) throws RemoteException; public double minus(double a1,double a2) throws RemoteException; }

package com.citibank.aimy.Example.client; import java.net.MalformedURLException; import java.rmi.Naming; import java.rmi.NotBoundException; import java.rmi.RemoteException; public class RMIClient { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try { LocalServiceInterface service = (LocalServiceInterface) Naming.lookup("rmi://169.181.237.53:1099/AddService"); System.out.println("Start to call"); System.out.println("Result of add:"+service.add(11.2, 22.3)); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NotBoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

package com.citibank.aimy.Example.server; import java.rmi.RemoteException; import java.rmi.server.UnicastRemoteObject; import com.citibank.aimy.Example.client.LocalServiceInterface; public class RemoteServiceImpl extends UnicastRemoteObject implements LocalServiceInterface { protected RemoteServiceImpl() throws RemoteException { super(); // TODO Auto-generated constructor stub } public double add(double a1, double a2) { // TODO Auto-generated method stub System.out.println("Start call remote service"); return a1+a2; } public double minus(double a1, double a2) { // TODO Auto-generated method stub return a1-a2; } }

package com.citibank.aimy.Example.server; import java.net.MalformedURLException; import java.rmi.AlreadyBoundException; import java.rmi.Naming; import java.rmi.RemoteException; public class RMIServer { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try { RemoteServiceImpl service = new RemoteServiceImpl(); System.out.println("Server start running"); Naming.rebind("AddService", service); System.out.println("Wait for client call"); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

// Stub class generated by rmic, do not edit. // Contents subject to change without notice. package com.citibank.aimy.Example.server; public final class RemoteServiceImpl_Stub extends java.rmi.server.RemoteStub implements com.citibank.aimy.Example.client.LocalServiceInterface, java.rmi.Remote { private static final long serialVersionUID = 2; private static java.lang.reflect.Method $method_add_0; private static java.lang.reflect.Method $method_minus_1; static { try { $method_add_0 = com.citibank.aimy.Example.client.LocalServiceInterface.class.getMethod("add", new java.lang.Class[] {double.class, double.class}); $method_minus_1 = com.citibank.aimy.Example.client.LocalServiceInterface.class.getMethod("minus", new java.lang.Class[] {double.class, double.class}); } catch (java.lang.NoSuchMethodException e) { throw new java.lang.NoSuchMethodError( "stub class initialization failed"); } } // constructors public RemoteServiceImpl_Stub(java.rmi.server.RemoteRef ref) { super(ref); } // methods from remote interfaces // implementation of add(double, double) public double add(double $param_double_1, double $param_double_2) throws java.rmi.RemoteException { try { Object $result = ref.invoke(this, $method_add_0, new java.lang.Object[] {new java.lang.Double($param_double_1), new java.lang.Double($param_double_2)}, 864055858262779977L); return ((java.lang.Double) $result).doubleValue(); } catch (java.lang.RuntimeException e) { throw e; } catch (java.rmi.RemoteException e) { throw e; } catch (java.lang.Exception e) { throw new java.rmi.UnexpectedException("undeclared checked exception", e); } } // implementation of minus(double, double) public double minus(double $param_double_1, double $param_double_2) throws java.rmi.RemoteException { try { Object $result = ref.invoke(this, $method_minus_1, new java.lang.Object[] {new java.lang.Double($param_double_1), new java.lang.Double($param_double_2)}, 8332056172489689102L); return ((java.lang.Double) $result).doubleValue(); } catch (java.lang.RuntimeException e) { throw e; } catch (java.rmi.RemoteException e) { throw e; } catch (java.lang.Exception e) { throw new java.rmi.UnexpectedException("undeclared checked exception", e); } } }

http://blog.youkuaiyun.com/lucifer1016/archive/2007/09/10/1778970.aspx

http://apusic.javaeye.com/blog/44930

http://www.javaeye.com/topic/173909

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