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首先Fetion要有好友類，好友類有好多屬性，先設置四個：飛信號碼、電話號碼、簽名、在線狀態，代表所有的屬性。

Buddy

Buddy
package com.dr.fetion;

public class Buddy {
	private String fid;//飛信號碼
	private String mp;//電話
	private String imprease;//簽名
	private int flag;//在線狀態

	public String getFid() {
		return fid;
	}
	public void setFid(String fid) {
		this.fid = fid;
	}
	public String getMp() {
		return mp;
	}
	public void setMp(String mp) {
		this.mp = mp;
	}
	public String getImprease() {
		return imprease;
	}
	public void setImprease(String imprease) {
		this.imprease = imprease;
	}
	public int getFlag() {
		return flag;
	}
	public void setFlag(int flag) {
		this.flag = flag;
	}
	
}

然后是Fetion的服務器端FetionServer。每個Fetion用戶的信息都保存在服務器端，當然也包括好友列表，當客戶端登錄時會以電話號碼來尋找好友列表。

FetionServer

FetionServer
package com.dr.fetion;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FetionServer {
	private static List<Buddy> buddyList1 = new ArrayList<Buddy>();
	private static List<Buddy> buddyList2 = new ArrayList<Buddy>();
	
	private static Map<String,List<Buddy>> BuddyMap= new HashMap<String,List<Buddy>>();
	
	static {
		Buddy buddy = new Buddy();
		buddy.setFid("001");
		buddy.setMp("15097559394");
		buddy.setImprease("Hello !!");
		buddy.setFlag(0);
		
		buddyList1.add(buddy);
		
		buddy = new Buddy();
		buddy.setFid("002");
		buddy.setMp("15097559395");
		buddy.setImprease("Hi ,Hello !!");
		buddy.setFlag(1);
		
		buddyList1.add(buddy);
		BuddyMap.put("15097559300", buddyList1);
//		---------------------------------------------------
		buddy = new Buddy();
		buddy.setFid("003");
		buddy.setMp("15097559303");
		buddy.setImprease("Hello !!");
		buddy.setFlag(0);
		
		buddyList2.add(buddy);
		
		buddy = new Buddy();
		buddy.setFid("004");
		buddy.setMp("15097559302");
		buddy.setImprease("Hi ,Hello !!");
		buddy.setFlag(1);
		
		buddyList2.add(buddy);
		BuddyMap.put("15097559301", buddyList2);
	}
	public static List<Buddy> getBuddyList(String mp) {
		List<Buddy> buddyList = BuddyMap.get(mp);
		return buddyList;		
	}
}

最后是Fetion的客戶端FetionClient。用戶以電話號碼和密碼登錄后，連接服務器端，獲取好友列表，并判斷好友的在線狀態。

FetionClient

FetionClinet
package com.dr.fetion;

import java.util.List;

public class FetionClient {
	public static List<Buddy> loginFetion(String mp){
		List<Buddy> buddyList = FetionServer.getBuddyList(mp);
		return buddyList;
	}
	public static void main(String[] args){
		String mp = "15097559301";
		String pwd = "123";
		List<Buddy> buddyList = loginFetion(mp);
		for (Buddy buddy:buddyList){
			if(buddy.getFlag()==1){
				System.out.println("飛信號碼:"+buddy.getFid()+",手機號:"+buddy.getMp()+",簽名:"+buddy.getImprease()+"在線");
			}else{
				System.out.println("飛信號碼:"+buddy.getFid()+",手機號:"+buddy.getMp()+",簽名:"+buddy.getImprease()+"離線");
			}
		}
	}
}