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Redstone - Simple and Compact Java XML-RPC library

March 7th, 2007 by

Jon Moffet

Yesterday I had to look for a simple Java XML-RPC library in a simple proof of concept application.

Plainly speaking, I'm going to demonstrate XML-RPC concept to a bunch of friends who is unfamiliar with programming languages other than Java (but they are not 1337 programmers either!)

I'm looking for a simple library which isn't bloated with functionality and easy to use. After much surfing, I found Redstone XML-RPC Library.

Overall the library only size up to 44KB when zipped together and it can be use to either construct XML-RPC service or clients.

Compared to Apache XML-RPC, Redstone XML-RPC is much better suited for my use as a tool to introduce XML-RPC concept to a group of friend that never used it before.

To use it, you need to download XML-RPC library from Redstone project webpage first. Then mae appropriate adjustment to your CLASSPATH to include the Redstone library.

For this example, I use the XML-RPC API service which can be found at Foxrate.org: Currency Exchange website.

Here's the sample code that I use to demostrate XML-RPC to my friends :

PLAIN TEXT

JAVA:

import redstone.xmlrpc.*;
public class GetCurrency {
public static void main( String[] args ) throws Exception
{
new GetCurrency();
}
public GetCurrency() throws Exception {
//declare RPC object
XmlRpcClient client = new XmlRpcClient("http://foxrate.org/rpc/",true );
//
// invoke RPC call (3 parameter, rujuk atas)
//
// please check http://foxrate.org/ for list of currencies
//
Object token = client.invoke( "foxrate.currencyConvert", new Object[] { new String("USD"),
new String("MYR"), new Double(50.0) } );
XmlRpcStruct struct = (XmlRpcStruct)token;
//output
System.out.println(new Double(struct.getDouble("amount")).toString());
}
}