How to write trigger webservices java?

[sridevi]

Hi All,

I am working on salesforce to java through integration, I am new to webservices and triggers.

plz see the below webservices program and how to trigger the web services. 
plz help.. 

package com.ws; 

import java.rmi.RemoteException; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.SQLException; 

import javax.xml.rpc.ServiceException; 

import com.sforce.soap.enterprise.LoginResult; 
import com.sforce.soap.enterprise.QueryResult; 
import com.sforce.soap.enterprise.SessionHeader; 
import com.sforce.soap.enterprise.SforceServiceLocator; 
import com.sforce.soap.enterprise.SoapBindingStub; 
import com.sforce.soap.enterprise.fault.InvalidFieldFault; 
import com.sforce.soap.enterprise.fault.InvalidIdFault; 
import com.sforce.soap.enterprise.fault.InvalidQueryLocatorFault; 
import com.sforce.soap.enterprise.fault.InvalidSObjectFault; 
import com.sforce.soap.enterprise.fault.LoginFault; 
import com.sforce.soap.enterprise.fault.MalformedQueryFault; 
import com.sforce.soap.enterprise.fault.UnexpectedErrorFault; 
import com.sforce.soap.enterprise.sobject.Contact; 

public class ContactBpartner { 
private static final String USERNAME = ""; 
private static final String TOKEN = ""; 
private static final String PASSWORD = "" + TOKEN; 
private SoapBindingStub binding; 

public static void main(String args[]) throws InvalidSObjectFault, MalformedQueryFault, InvalidFieldFault, InvalidIdFault, UnexpectedErrorFault, InvalidQueryLocatorFault, RemoteException, InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException { 
ContactBpartner d = new ContactBpartner(); 
d.login(); 
d.search(); 

} 

private void login() throws InvalidIdFault, UnexpectedErrorFault, LoginFault, RemoteException { 
try { 
binding = (SoapBindingStub) new SforceServiceLocator().getSoap(); 
} catch (ServiceException e1) { 
e1.printStackTrace(); 
} 
LoginResult loginresult = null; 
loginresult = binding.login(USERNAME, PASSWORD); 
binding._setProperty(SoapBindingStub.ENDPOINT_ADDRESS_PROPERTY, 
loginresult.getServerUrl()); 
SessionHeader sh = new SessionHeader(); 
sh.setSessionId(loginresult.getSessionId()); 
binding.setHeader(new SforceServiceLocator().getServiceName() 
.getNamespaceURI(), "SessionHeader", sh); 

} 

private void search() throws InvalidSObjectFault, MalformedQueryFault, 
InvalidFieldFault, InvalidIdFault, UnexpectedErrorFault, 
InvalidQueryLocatorFault, RemoteException, InstantiationException, 
IllegalAccessException, ClassNotFoundException, SQLException { 
Connection conn = null; 

PreparedStatement ps = null; 
StringBuffer sql = new StringBuffer(256); 

try{ 
QueryResult qr = binding.query("select id, Name from Contact "); 

if (qr.getSize() > 0) { 
for (int i = 0; i <= qr.getSize(); i++) { 
Contact l = (Contact)qr.getRecords(i); 
.......................................................... 
................................................................................................... 
.................................................................................. 
} 

} 
}catch (Exception e) { 
} 
} 
}