Swing贪吃蛇游戏(四)：增加游戏得分排行榜功能

在上几篇博文中，介绍了

Swing贪吃蛇游戏(一)：基本功能实现 >>>

[url]http://mouselearnjava.iteye.com/blog/1913290[/url]

Swing贪吃蛇游戏(二)：增加随机产生障碍物功能 >>>

[url]http://mouselearnjava.iteye.com/blog/1913886[/url]

Swing贪吃蛇游戏(三)：增加游戏进度存储和加载功能 >>>

[url]http://mouselearnjava.iteye.com/blog/1914225[/url]

本文在这些既有功能之上，添加游戏得分排行榜功能。[b]得分排行榜上列出Top 10的记录信息，包括玩家名称，得分和名次。[/b]

为了完成这个功能，我们需要做的主要改动有如下几点：

首先：创建与记录相关的类。

其次：完成游戏结束后对记录文件更新的操作。

最后：完成点击Record相关的MenuItem，读取记录信息，并用ScrollPane展示出来。

[b]1. 创建与记录相关的类[/b]

package my.games.snake.model;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;


/**
 * @author Eric

 * @desc 贪吃蛇游戏的排行榜
 */
public class SnakeGameRecords implements Serializable {

	private static final long serialVersionUID = 4513299590910220441L;

	private static final int TOP_TEN = 10;

	private Record[] records = null;

	private int numberInRecord = 0; // 排行榜中已经拥有的记录个数

	public SnakeGameRecords() {
		records = new Record[TOP_TEN];
	}

	@SuppressWarnings("unchecked")
	public void sortRecords() {
		Collections.sort(Arrays.asList(getAvailableRecords()), new RecordComparator());
	}

	private Record[] getAvailableRecords(){
		Record[] availableRecords = new Record[numberInRecord];
		for(int i=0;i			availableRecords[i] = new Record(records[i].getPlayer(),records[i].getScore());
		}
		return availableRecords;
	}

	/**
	 * 
	 * @return
	 */
	public Record getLastAvailableRecord() {
		return isEmpty() ? null : records[numberInRecord - 1];
	}

	/**
	 * 
	 * @param record
	 */
	public void addRecordToTopTen(Record record) {
		if (isEmpty()) {
			records[0] = record;
			numberInRecord++;
			return;
		}

		if (isFull()) {
			if (records[TOP_TEN - 1].getScore() < record.getScore()) {
				records[TOP_TEN - 1] = record;
				sortRecords();
				return;
			}
		}

		records[numberInRecord] = record;
		numberInRecord++;
		sortRecords();
	}

	/**
	 * 
	 * @return
	 */
	public boolean isEmpty() {
		return 0 == numberInRecord;
	}

	/**
	 * 
	 * @return
	 */
	public boolean isFull() {
		return TOP_TEN == numberInRecord;
	}

	/**
	 * @return the numberInRecord
	 */
	public int getNumberInRecord() {
		return numberInRecord;
	}

	/**
	 * @param numberInRecord
	 *            the numberInRecord to set
	 */
	public void setNumberInRecord(int numberInRecord) {
		this.numberInRecord = numberInRecord;
	}

	/**
	 * @return the records
	 */
	public Record[] getRecords() {
		return records;
	}

	/**
	 * @param records
	 *            the records to set
	 */
	public void setRecords(Record[] records) {
		this.records = records;
	}

	private class RecordComparator implements Comparator {

		public int compare(Object o1, Object o2) {
			Record r1 = (Record) o1;
			Record r2 = (Record) o2;

			return (0 == compareScore(r1, r2)) ? compareName(r1, r2)
					: compareScore(r1, r2);
		}

		private int compareScore(Record r1, Record r2) {
			return r1.getScore() - r2.getScore();
		}

		private int compareName(Record r1, Record r2) {
			return r1.getPlayer().compareTo(r2.getPlayer());
		}

	}

}

package my.games.snake.model.record;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;

import my.games.snake.model.SnakeGameRecords;

/**
 * 
 * @author Eric
 * @vesion 1.0
 * @desc Read Record
 */
public class ReadRecord {

	public SnakeGameRecords readRecordsFromFile(File recordFile) {
		SnakeGameRecords records = new SnakeGameRecords();
		FileInputStream fileInput = null;
		ObjectInputStream objectInput = null;

		if (!recordFile.exists()) {
			return records;
		}

		try {
			fileInput = new FileInputStream(recordFile);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		try {
			objectInput = new ObjectInputStream(fileInput);
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		Object o = null;
		try {
			o = objectInput.readObject();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		try {
			objectInput.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			fileInput.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		records = (SnakeGameRecords) o;
		records.sortRecords();
		return records;
	}

}

package my.games.snake.model.record;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

import my.games.snake.model.SnakeGameRecords;

/**
 * @author Eric
 * @vesion 1.0
 * @desc Write records
 */
public class WriteRecord {

	public void writeRecordToFile(SnakeGameRecords records, File recordFile) {
		FileOutputStream fileOutput = null;
		try {
			fileOutput = new FileOutputStream(recordFile);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		ObjectOutputStream objectOutput = null;
		try {
			objectOutput = new ObjectOutputStream(fileOutput);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			objectOutput.writeObject(records);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			objectOutput.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			fileOutput.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

[b]2. 完成游戏结束后对记录文件更新的操作。[/b]

[b]3. 完成点击Record相关的MenuItem，读取记录信息，并用ScrollPane展示出来。[/b]

public class SnakeGameFrame extends JFrame {
   private JMenuItem recordMI = new JMenuItem("Record");

   public SnakeGameFrame() {
      setMenu.add(recordMI);
      recordMI.addActionListener(new RecordAction());
   }

private class RecordAction implements ActionListener {

		@SuppressWarnings("deprecation")
		public void actionPerformed(ActionEvent event) {
			File file = new File("file.dat");
			SnakeGameRecords records = new ReadRecord()
					.readRecordsFromFile(file);
			records.sortRecords();
			JScrollPane panel = new RecordScrollPane().getReadScrollPane(records,
					file);

			JDialog recordDialog = new JDialog(SnakeGameFrame.this, "贪吃蛇游戏");
			recordDialog.setBounds(300, 300, 300, 219);

			Container container = recordDialog.getContentPane();
			container.add(panel);
			recordDialog.show();
		}
	}
}

package my.games.snake.ui;

import java.io.File;

import javax.swing.JScrollPane;
import javax.swing.JTable;

import my.games.snake.model.Record;
import my.games.snake.model.SnakeGameRecords;

public class RecordScrollPane{

	private static final long serialVersionUID = -3552642981292000951L;

	public JScrollPane getReadScrollPane(SnakeGameRecords records,
			File recordFile) {
		Object[][] data = new Object[records.getNumberInRecord()][3];
		for (int i = 0; i < records.getNumberInRecord(); i++) {
			Record record = records.getRecords()[i];
			data[i][0] = String.valueOf(i + 1);
			data[i][1] = record.getPlayer();
			data[i][2] = String.valueOf(record.getScore());
		}
		Object[] columnNames = new Object[3];
		columnNames[0] = "ID";
		columnNames[1] = "Name";
		columnNames[2] = "Score";
		JTable table = new JTable(data, columnNames);
		table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
		JScrollPane pane = new JScrollPane(table);
		return pane;
	}
}

//游戏结束时，如果分数大于0，那么将分数写入到排行榜中去

public class SnakeGamePanel extends JPanel {
private void writeScore() {
		if (score == 0) {
			return;
		}
		File file = new File("file.dat");
		SnakeGameRecords records = new ReadRecord().readRecordsFromFile(file);
		if (records == null
				|| records.isEmpty()
				|| !records.isFull()
				|| (records.getLastAvailableRecord().getScore() < score && records
						.isFull())) {
			String playerName = JOptionPane
					.showInputDialog("Please input your name");
			if (playerName == null || playerName.length() == 0
					|| playerName.trim().equals("")) {
				playerName = "无名英雄";
			}
			Record record = new Record(playerName, score);
			records.addRecordToTopTen(record);
			new WriteRecord().writeRecordToFile(records, file);
		}

	}
}

一个演示的示例如下：

游戏结束时，输入Frank的玩家名字。

[img]http://dl2.iteye.com/upload/attachment/0087/5102/0034b235-7358-35de-b362-e1a37e5225c0.jpg[/img]

查看得分排行榜：

[img]http://dl2.iteye.com/upload/attachment/0087/5106/2dd54c9d-f22e-3021-a440-228cfe2fb3cf.jpg[/img]

[img]http://dl2.iteye.com/upload/attachment/0087/5104/16cc9469-7e59-3485-b0ad-dee712e7eaaa.jpg[/img]


至此，一个拥有进度存储和加载功能，得分排行榜以及随机产生障碍物的Swing贪吃蛇游戏就完成了。

代码还没有优化过，详细代码请参考附件MySnakeGame.7z