saveplayer.java

BravePiglet.rar 勇敢的猪Java游戏 由本人原创

package com.lovo.pig.util;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collections;
import java.util.TreeMap;

import com.lovo.pig.model.Player;

/**
 * 存/取 玩家信息工具类
 * @author fw
 *
 */
public class SavePlayer {
	
	/**保存玩家信息的集合 键为分数,值为整个玩家信息*/
	public TreeMap<Integer,Player> plays;
	
	/**做对象序列化通过对象流要写入文件名称*/
	private static final String fileName = "save.dat";
	
	private SavePlayer(){
		
	}
	
	private static SavePlayer sp = null;
	
	/**单例模式获得当前类对象*/
	public static SavePlayer getSavePlayer()
	{
		if(sp==null)
		{
			sp = new SavePlayer();
		}
		return sp;
	}
	
	/**
	 * 获得文件
	 * @return
	 * @throws IOException
	 */
	private File getFile() throws IOException
	{
		File file = new File(fileName);
		/**如果文件不存在则创建一个新的*/
		if(!file.exists())
		{
			file.createNewFile();
		}
		return file;
	}
	
	/**
	 * 保存玩家信息
	 * 通过对象输出流向文件里写入
	 * @param plays
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public void savePlayer(TreeMap<Integer,Player> plays) throws FileNotFoundException, IOException
	{
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(this.getFile()));
		oos.writeObject(plays);
		oos.flush();
		oos.close();
	}
	
	/**
	 * 获得玩家信息
	 * 通过对象输入流从文件里读取
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 * @throws ClassNotFoundException
	 */
	@SuppressWarnings("unchecked")
	public TreeMap<Integer,Player> loadPlayer() throws FileNotFoundException, IOException, ClassNotFoundException
	{
		FileInputStream fis = new FileInputStream(this.getFile());
		/**
		 * 如果文件里可以读取的字节不为0(当前玩家不是第1个游戏者) 
		 * 再用对象输入流读取文件内容
		 * */
		if(fis.available()!=0)
		{
			ObjectInputStream ois = new ObjectInputStream(fis);
			this.plays = (TreeMap<Integer, Player>) ois.readObject();
			ois.close();
		}
		else
		{
			/**如果是第1个玩的玩家 则初始化一个空的降序排列的TreeMap*/
			this.plays = new TreeMap<Integer,Player>(Collections.reverseOrder());
		}
		return this.plays;
	}
}