zipcodeclient.java

一个java的rmi实例

//package ZipClient;

// A client for ZipCodeServer.
// Uses ZipCodeServer as an interface and tests all methods implemented
// by remote server.

// Reads data from a local file containing (city, zip) pairs as follows:
//   city1
//   zip1
//   ...
//   ...


import java.io.*;

public class ZipCodeClient 
{ 	// main takes four arguments:
    	// (0) a host. 
    	// (1) a port.
    	// (2) a service name.
    	// (3) a file name. 
    	public static void main(String[] args) throws IOException
    	{	String host = args[0];
		int port = Integer.parseInt(args[1]);
		String serviceName = args[2];
		BufferedReader in = new BufferedReader(new FileReader(args[3]));

		// Locate the registry and get ror.
		SimpleRegistry sr = 
	    		LocateSimpleRegistry.getRegistry(host, port);
		RemoteObjectRef ror = sr.lookup(serviceName);

		// Create stub (=proxy) out of ror.
   		// You must write the stub class for ZipCodeServerImpl.java.
		// It won't be automatically generated by rmic as in the standard RMI.
   		// For each method in ZipCodeServerImpl.java, there should be a
		// corresponding method in the stub class.
 		ZipCodeServerImpl_stub zcs = (ZipCodeServerImpl_stub) ror.localise();        
        
		// Read data file (3) and construct a "local" zip code list,
		// consisting linked instances of ZipCodeList.
		// Later, this will be sent to the server.
		// again no error check!
		ZipCodeList l = null;
		boolean flag = true;
		while (flag)
	    	{	String city = in.readLine();
			String code = in.readLine();
			if (city == null)
		    		flag = false;
			else
		    		l = new ZipCodeList(city.trim(), code.trim(), l);
	    	}
		// The final value of l is the instance at the head of the list.
	
		// Print out the local list just constructed.
		System.out.println("This is the original list.");
		ZipCodeList temp = l;
		while (temp !=null)            
	    	{	System.out.println("city: "+temp.city+", "+"code: "+temp.ZipCode);       
			temp = temp.next;                        
	    	}
	
		// Test the (remote) initialise method implemented by ZipCodeServerImpl.
		// Main challenge is to code the stub to marshall the whole list, l.
		zcs.initialise(l); 
		System.out.println("\n Server initalised.");

		// Test the (remote) find method.
		System.out.println("\n This is the remote list given by find.");
		temp = l;
		while (temp !=null)
	    	{	// Here is a test.
			String res = zcs.find(temp.city);
			System.out.println("city: "+temp.city+", "+"code: "+res);
			temp=temp.next;
	    	}        		
	
		// Test the (remote) findAll method.
		System.out.println("\n This is the remote list given by findAll.");
		// Here is a test.
	
        	temp = zcs.findAll();   // Called once: cf. zcs.find above.
	
        	while (temp !=null)
	    	{	System.out.println("city: "+temp.city+", "+"code: "+temp.ZipCode);
			temp=temp.next;
	    	}        		
	
		// Test the (remote) printAll method.
		System.out.println("\n We test printing at remote site.");
		// here is a test.
		zcs.printAll();
    	}
}