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遠程方法調用(RMI)-服務器如何知道客戶端調用了什么?

[英]Remote Method Invocation(RMI) - how the server knows what the client invoked?

我有一個程序,其中包含這些類:
RMIServer,
RMIClient,
RMII實施
RMI接口

如下:

RMIServer:

public static void main ( String args[] ) throws Exception
{
  System.out.println( "RMI Server started" ) ;

  String codebase = "http://localhost:8080/rmi/" ; 
  String name     = "RMIInterface"               ;

  System.setProperty ( "java.rmi.server.codebase" , codebase  ) ;

  RMIImplementation obj  = new RMIImplementation()                                    ;
  RMIInterface      stub = (RMIInterface) UnicastRemoteObject.exportObject( obj , 0 ) ;

  LocateRegistry.getRegistry().bind( name , stub ) ;

  System.out.println( "Done!" ) ;

}  

RMIClient:

public static void main ( String args[] ) throws Exception
{
    String host = "localhost"    ;
    String name = "RMIInterface" ;


    Registry     registry = LocateRegistry.getRegistry( host )     ;
    RMIInterface i        = (RMIInterface) registry.lookup( name ) ;

    System.out.println("RMI service call result:");
    for(Candidate c : list){
        if(c.status == Candidate.Eligibility.ELIGIBLE ){
            System.out.println( "  Issued a license to " + i.issueLicense(c.name, c.age) ) ;   
        }
    } 

    System.out.println( "License Server finished" ) ;
}

RMI接口:

public interface RMIInterface extends Remote
{
  String issueLicense ( String name , int age ) throws RemoteException ;
}

RMII實施:

public class RMIImplementation implements RMIInterface {

    public RMIImplementation() {
        System.out.println("RMIImplementation instance created and ready to serve");
    }

    @Override
    public String issueLicense(String name, int age) {
        return name + " (" + age + ")";
    }
}

(該程序用於測試。測試在一台機器上完成。)

好吧,客戶端調用遠程對象,發送一些參數。

我希望RMIServer打印出從客戶端到遠程對象的調用摘要。 我應該怎么做才能獲得這些信息?

我希望輸出看起來像這樣:

RMI Server started
RMIImplementation instance created and ready to serve
RMI service called for : 
  tonny (30)
  john (26)

您的問題無處不在,但可以滿足您的實際目標

-Djava.rmi.server.logCalls=true

在服務器上。

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