Thread: Using xmlRpc in java

Hello i want create gui for aria2c( internet download manager ) with java for doing this aria2c has built in xmlrpc. i use xmlRpc to create gui for aria2c. in aria2c support site there is a example code for python programming language that uses xmlrpc

>>> import xmlrpclib
>>> s = xmlrpclib.ServerProxy('http://localhost:6800/rpc')
>>> s.aria2.addUri(['http://example.org/file'])
'1'

i write this java code for doing this in java

package Aria2c;
 
import java.net.MalformedURLException;
import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.client.XmlRpcClientConfigImpl;
import java.net.URL;
import org.apache.xmlrpc.client.XmlRpcClient;
import java.util.Vector;
 
public class JavaClient{
 
	private static Vector< String > params;
	public JavaClient( )
	{
		params.add("http://rs230dt.rapidshare.com/files/344243800/10012723.LinuxCBT.Debian.part8.rar");
	}
    	public static void main( String[] args )
    	{
    		XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
    		try {
				config.setServerURL(new URL("http://localhost:6800/rpc"));
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    		XmlRpcClient client = new XmlRpcClient();
    		client.setConfig(config);
 
    		try {
				client.execute("aria2.addUri", params );
			} catch (XmlRpcException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
 
    }
}

but when i want compile this i have these exceptions

org.apache.xmlrpc.XmlRpcException: Failed to read server's response: Connection refused
	at org.apache.xmlrpc.client.XmlRpcStreamTransport.sendRequest(XmlRpcStreamTransport.java:161)
	at org.apache.xmlrpc.client.XmlRpcHttpTransport.sendRequest(XmlRpcHttpTransport.java:143)
	at org.apache.xmlrpc.client.XmlRpcSunHttpTransport.sendRequest(XmlRpcSunHttpTransport.java:69)
	at org.apache.xmlrpc.client.XmlRpcClientWorker.execute(XmlRpcClientWorker.java:56)
	at org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:167)
	at org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:158)
	at org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:147)
	at Aria2c.JavaClient.main(JavaClient.java:30)
Caused by: java.net.ConnectException: Connection refused
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:310)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:176)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:163)
	at java.net.Socket.connect(Socket.java:546)
	at java.net.Socket.connect(Socket.java:495)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:174)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:409)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:240)
	at sun.net.www.http.HttpClient.New(HttpClient.java:321)
	at sun.net.www.http.HttpClient.New(HttpClient.java:338)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:814)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:755)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:680)
	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:858)
	at org.apache.xmlrpc.client.XmlRpcSunHttpTransport.writeRequest(XmlRpcSunHttpTransport.java:104)
	at org.apache.xmlrpc.client.XmlRpcStreamTransport.sendRequest(XmlRpcStreamTransport.java:151)
	... 7 more
Caused by:
java.net.ConnectException: Connection refused
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:310)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:176)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:163)
	at java.net.Socket.connect(Socket.java:546)
	at java.net.Socket.connect(Socket.java:495)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:174)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:409)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:240)
	at sun.net.www.http.HttpClient.New(HttpClient.java:321)
	at sun.net.www.http.HttpClient.New(HttpClient.java:338)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:814)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:755)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:680)
	at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:858)
	at org.apache.xmlrpc.client.XmlRpcSunHttpTransport.writeRequest(XmlRpcSunHttpTransport.java:104)
	at org.apache.xmlrpc.client.XmlRpcStreamTransport.sendRequest(XmlRpcStreamTransport.java:151)
	at org.apache.xmlrpc.client.XmlRpcHttpTransport.sendRequest(XmlRpcHttpTransport.java:143)
	at org.apache.xmlrpc.client.XmlRpcSunHttpTransport.sendRequest(XmlRpcSunHttpTransport.java:69)
	at org.apache.xmlrpc.client.XmlRpcClientWorker.execute(XmlRpcClientWorker.java:56)
	at org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:167)
	at org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:158)
	at org.apache.xmlrpc.client.XmlRpcClient.execute(XmlRpcClient.java:147)
	at Aria2c.JavaClient.main(JavaClient.java:30)

how i can improve this cod?
please help me

ConnectException (Java 2 Platform SE v1.4.2)

XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
try {
config.setServerURL(new URL("http://localhost:6800/rpc"));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
XmlRpcClient client = new XmlRpcClient();
client.setConfig(config);

try {
client.execute("aria2.addUri", params );
} catch (XmlRpcException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

}


This part appears to be throwing those exceptions.

Then it calls printStackTrace();

By any chance is this supposed to be an applet, just wondering? Applets don't have a main method.

This exception is thrown by the XmlRpcClient, if an invocation of the remote method failed. Failure may have two reasons: The invocation failed on the remote side (for example, an exception was thrown within the server) or the communication with the server failed. The latter is indicated by throwing an instance of XmlRpcClientException.

at Aria2c.JavaClient.main(JavaClient.java:30)

Looks like the problems is at line 30, or it's calling the method that causes the problem, directly or indirectly, there.

This error is beyond my knowledge. I've no clue about networking yet.

I've never use the package you are referring to, but it seems you are attempting to access the localhost (your machine) on port 6800...which means something should be listening and/or broadcasting on said port. Given the exception I'd say this is not the case, so you probably need to figure out if there are additional installation steps to set up the listener/broadcaster for that port.