zipcodeserverimpl.java

一个java的rmi实例

import java.io.*;

// It is assumed that this object is directly called as follows:
//
//   java yourRMI ZipCodeServerImpl registryhost resigstryport servicename
//
// Therefore, it does not contain main: new object creation, binding
// (with SimpleRegistryServer), etc., is done via yourRMI.

public class ZipCodeServerImpl
    implements ZipCodeServer
{
    ZipCodeList l;
	
    // this is a constructor.
    public ZipCodeServerImpl()
    {
	l=null;
    }

    // When the following method is called, marshalled data
    // should be sent to this remote object, and reconstructed.
    public void initialise(ZipCodeList newlist)
    {
	l=newlist;
    }

    // Basic function: look up a city name, and return its zipcode.
    public String find(String request)
    {
	// Search the list.
	ZipCodeList temp = l;
	while (temp != null && !temp.city.equals(request))
	    temp = temp.next;

	// The result is either null or we've found a match.
	if (temp==null)
	    return null;
	else
	    return temp.ZipCode;
    }

    // The following short method should send the marshalled 
    // whole list to the client site.  The main challenge is coding
	 // the skeleton.
    public ZipCodeList findAll()
    {
	return l;
    }

    // The following method prints at the server site.
    public void printAll() 
    {
	ZipCodeList temp=l;
	while (temp !=null)            
	    {
		System.out.println
		    ("city: "+temp.city+", "+
		     "code: "+temp.ZipCode+"\n");        
		temp = temp.next;                        
	    }
    }
}