本次Spark二次开发是为了客服模块的开发， 能让用户一旦点击该客服则直接自动添加好友，而客服放则需自动添加好友，不同弹出对话框进行同意，这方便的广大客服。

现在废话不多说，直接上代码。

package org.jivesoftware.spark.ui;

import java.util.ArrayList;

import org.jivesoftware.spark.util.log.Log;
import org.jivesoftware.spark.util.ModelUtil;
import org.jivesoftware.resource.Res;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.RosterGroup;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.packet.RosterPacket;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.spark.SparkManager;
import org.jivesoftware.spark.UserManager;

/**
 * 处理所有订阅请求
 * @author jian
 *
 */
public class MySubscription {
	private String jid;
	//构造函数
	public MySubscription(){
	}
	/**
	 * 调用
	 * @param jid 主键ID
	 */
	public void invoke(final String jid){
		this.jid=jid;
		final Roster roster=SparkManager.getConnection().getRoster();//返回好友册
		//如果用户已经在好友当中，则不显示
		RosterEntry entry=roster.getEntry(jid);//返回对应的用户
		if(entry!=null&&entry.getType()==RosterPacket.ItemType.to){
			Presence response=new Presence(Presence.Type.subscribed);
			response.setTo(jid);
			SparkManager.getConnection().sendPacket(response);
			return;
		}
		UserManager userManager=SparkManager.getUserManager();
		String username=userManager.getNickname(userManager.getFullJID(jid));
		username=username==null?StringUtils.parseName(UserManager.unescapeJID(jid)):username;//给usernam赋值
		boolean addEntry=addEntry(username);
		GetGroupName();
		if(addEntry){
			Presence response=new Presence(Presence.Type.subscribed);
			response.setTo(jid);
			SparkManager.getConnection().sendPacket(response);
		}
	}
	/**
	 * 同意添加好友
	 */
	private boolean addEntry(String username){
		String errorMessage=Res.getString("title.error");
		String groupName="Friends";
		
		//获取该用户组是否存在
		ContactGroup contactGroup=SparkManager.getWorkspace().getContactList().getContactGroup(groupName);
		boolean isSharedGroup = contactGroup!=null&&contactGroup.isSharedGroup();
		System.out.println("用户组存在？"+isSharedGroup);
		if(isSharedGroup){
			errorMessage=Res.getString("message.cannot.add.contact.to.shared.group");
		}else if(!ModelUtil.hasLength(username)){
			errorMessage=Res.getString("message.specify.contact.jid");
		}else if(!ModelUtil.hasLength(groupName)){
			errorMessage=Res.getString("message.specify.group");
		}else if(ModelUtil.hasLength(username)&&ModelUtil.hasLength(groupName)&&!isSharedGroup){
			System.out.println("添加好友");
			System.out.println("直接输出Group组："+groupName);
			addEntity(jid, username, groupName);
			return true;
		}
		return false;
	}
	
	/**
	 * 把新用户添加到好友名单
	 * @param jid 账号
	 * @param username 昵称
	 * @param groupName 组名
	 */
	private RosterEntry addEntity(String jid,String username,String groupName){
		String[] groups={groupName};
		System.out.println("开始添加了哦");
        for(int i=0;i<groups.length;i++){
        	System.out.println(groups[i]);
        }
		Roster roster=SparkManager.getConnection().getRoster();
		RosterEntry userEntry=roster.getEntry(jid);
		boolean isSubscribed=true;
		if(userEntry!=null){
			isSubscribed=userEntry.getGroups().size()==0;
		}
		if(isSubscribed){
			try {
				roster.createEntry(jid, username, new String[]{groupName});
			} catch (XMPPException e) {
				Log.error("不能添加新的好友"+jid,e);
			}
			return roster.getEntry(jid);
		}
		try {
			RosterGroup rosterGroup=roster.getGroup(groupName);
			if(rosterGroup==null){
				rosterGroup=roster.createGroup(groupName);
			}
			if(userEntry==null){
				roster.createEntry(jid, username, groups);
				userEntry=roster.getEntry(jid);
			}else {
				userEntry.setName(username);
				rosterGroup.addEntry(userEntry);
			}
			userEntry=roster.getEntry(jid);
		} catch (XMPPException ex) {
			Log.error(ex);
		}
		return userEntry;
	}
	
	private void GetGroupName(){
		ArrayList<String> list=new ArrayList<String>();
		for(ContactGroup group:SparkManager.getWorkspace().getContactList().getContactGroups()){
			if(!group.isOfflineGroup()&&!"Unfiled".equalsIgnoreCase(group.getGroupName())&&!group.isSharedGroup()){
				list.add(group.getGroupName());
				System.out.println(group.getGroupName());
			}
		}
	}
}

而监听并调用的类为：org.jivesoftware.spark.ui.ContactList.java 第2134行