我的目的是显示背景图片，而不是使得背景图片透明，到底哪里出错？

package org.liky.game.frame;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Toolkit;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.JFrame;import javax.swing.JOptionPane;public class FiveChessFrame extends JFrame implements MouseListener, Runnable {// 取得屏幕的宽度int width = Toolkit.getDefaultToolkit().getScreenSize().width;// 取得屏幕的高度int height = Toolkit.getDefaultToolkit().getScreenSize().height;// 背景图片BufferedImage bgImage = null;// 保存棋子的坐标int x = 0;int y = 0;// 保存之前下过的全部棋子的坐标// 其中数据内容 0：表示这个点并没有棋子， 1：表示这个点是黑子， 2：表示这个点是白子int[][] allChess = new int[19][19];// 标识当前应该黑棋还是白棋下下一步boolean isBlack = true;// 标识当前游戏是否可以继续boolean canPlay = true;// 保存显示的提示信息String message = "黑方先行";// 保存最多拥有多少时间(秒)int maxTime = 0;// 做倒计时的线程类Thread t = new Thread(this);// 保存黑方与白方的剩余时间int blackTime = 0;int whiteTime = 0;// 保存双方剩余时间的显示信息String blackMessage = "无限制";String whiteMessage = "无限制";public FiveChessFrame() {// 设置标题this.setTitle("五子棋");// 设置窗体大小this.setSize(500, 500);// 设置窗体出现位置this.setLocation((width - 500) / 2, (height - 500) / 2);// 将窗体设置为大小不可改变this.setResizable(false);// 将窗体的关闭方式设置为默认关闭后程序结束this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 为窗体加入监听器this.addMouseListener(this);// 将窗体显示出来this.setVisible(true);t.start();t.suspend();// 刷新屏幕,防止开始游戏时出现无法显示的情况.this.repaint();String imagePath = "" ;try {imagePath = System.getProperty("user.dir")+"/bin/image/background.jpg" ;bgImage = ImageIO.read(new File(imagePath.replaceAll("\\\\", "/")));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void paint(Graphics g) {// 双缓冲技术防止屏幕闪烁BufferedImage bi = new BufferedImage(500, 500,BufferedImage.TYPE_INT_RGB);Graphics g2 = bi.createGraphics();g2.setColor(Color.BLACK);// 绘制背景g2.drawImage(bgImage, 1, 20, this);// 输出标题信息g2.setFont(new Font("黑体", Font.BOLD, 20));g2.drawString("游戏信息：" + message, 130, 60);// 输出时间信息g2.setFont(new Font("宋体", 0, 14));g2.drawString("黑方时间：" + blackMessage, 30, 470);g2.drawString("白方时间：" + whiteMessage, 260, 470);// 绘制棋盘for (int i = 0; i < 19; i++) {g2.drawLine(10, 70 + 20 * i, 370, 70 + 20 * i);g2.drawLine(10 + 20 * i, 70, 10 + 20 * i, 430);}// 标注点位g2.fillOval(68, 128, 4, 4);g2.fillOval(308, 128, 4, 4);g2.fillOval(308, 368, 4, 4);g2.fillOval(68, 368, 4, 4);g2.fillOval(308, 248, 4, 4);g2.fillOval(188, 128, 4, 4);g2.fillOval(68, 248, 4, 4);g2.fillOval(188, 368, 4, 4);g2.fillOval(188, 248, 4, 4);/** //绘制棋子 x = (x - 10) / 20 * 20 + 10 ; y = (y - 70) / 20 * 20 + 70 ;* //黑子 g.fillOval(x - 7, y - 7, 14, 14); //白子 g.setColor(Color.WHITE) ;* g.fillOval(x - 7, y - 7, 14, 14); g.setColor(Color.BLACK) ;* g.drawOval(x - 7, y - 7, 14, 14);*/// 绘制全部棋子for (int i = 0; i < 19; i++) {for (int j = 0; j < 19; j++) {if (allChess[i][j] == 1) {// 黑子int tempX = i * 20 + 10;int tempY = j * 20 + 70;g2.fillOval(tempX - 7, tempY - 7, 14, 14);}if (allChess[i][j] == 2) {// 白子int tempX = i * 20 + 10;int tempY = j * 20 + 70;g2.setColor(Color.WHITE);g2.fillOval(tempX - 7, tempY - 7, 14, 14);g2.setColor(Color.BLACK);g2.drawOval(tempX - 7, tempY - 7, 14, 14);}}}g.drawImage(bi, 0, 0, this);}public void mouseClicked(MouseEvent e) {// TODO Auto-generated method stub}public void mouseEntered(MouseEvent e) {// TODO Auto-generated method stub}public void mouseExited(MouseEvent e) {// TODO Auto-generated method stub}public void mousePressed(MouseEvent e) {// TODO Auto-generated method stub/** System.out.println("X:"+e.getX()); System.out.println("Y:"+e.getY());*/if (canPlay == true) {x = e.getX();y = e.getY();if (x >= 10 && x <= 370 && y >= 70 && y <= 430) {x = (x - 10) / 20;y = (y - 70) / 20;if (allChess[x][y] == 0) {// 判断当前要下的是什么颜色的棋子if (isBlack == true) {allChess[x][y] = 1;isBlack = false;message = "轮到白方";} else {allChess[x][y] = 2;isBlack = true;message = "轮到黑方";}// 判断这个棋子是否和其他的棋子连成5连，即判断游戏是否结束boolean winFlag = this.checkWin();if (winFlag == true) {JOptionPane.showMessageDialog(this, "游戏结束,"+ (allChess[x][y] == 1 ? "黑方" : "白方") + "获胜！");canPlay = false;}} else {JOptionPane.showMessageDialog(this, "当前位置已经有棋子，请重新落子！");}this.repaint();}}/* System.out.println(e.getX() + " -- " + e.getY()); */// 点击开始游戏按钮if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 70&& e.getY() <= 100) {int result = JOptionPane.showConfirmDialog(this, "是否重新开始游戏?");if (result == 0) {// 现在重新开始游戏// 重新开始所要做的操作: 1)把棋盘清空,allChess这个数组中全部数据归0.// 2) 将游戏信息: 的显示改回到开始位置// 3) 将下一步下棋的改为黑方for (int i = 0; i < 19; i++) {for (int j = 0; j < 19; j++) {allChess[i][j] = 0;}}// 另一种方式 allChess = new int[19][19];message = "黑方先行";isBlack = true;blackTime = maxTime;whiteTime = maxTime;if (maxTime > 0) {blackMessage = maxTime / 3600 + ":"+ (maxTime / 60 - maxTime / 3600 * 60) + ":"+ (maxTime - maxTime / 60 * 60);whiteMessage = maxTime / 3600 + ":"+ (maxTime / 60 - maxTime / 3600 * 60) + ":"+ (maxTime - maxTime / 60 * 60);t.resume();} else {blackMessage = "无限制";whiteMessage = "无限制";}this.canPlay = true;this.repaint();}}// 点击游戏设置按钮if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 120&& e.getY() <= 150) {String input = JOptionPane.showInputDialog("请输入游戏的最大时间(单位:分钟),如果输入0,表示没有时间限制:");try {maxTime = Integer.parseInt(input) * 60;if (maxTime < 0) {JOptionPane.showMessageDialog(this, "请输入正确信息,不允许输入负数!");}if (maxTime == 0) {int result = JOptionPane.showConfirmDialog(this,"设置完成,是否重新开始游戏?");if (result == 0) {for (int i = 0; i < 19; i++) {for (int j = 0; j < 19; j++) {allChess[i][j] = 0;}}// 另一种方式 allChess = new int[19][19];message = "黑方先行";isBlack = true;blackTime = maxTime;whiteTime = maxTime;blackMessage = "无限制";whiteMessage = "无限制";this.canPlay = true;this.repaint();}}if (maxTime > 0) {int result = JOptionPane.showConfirmDialog(this,"设置完成,是否重新开始游戏?");if (result == 0) {for (int i = 0; i < 19; i++) {for (int j = 0; j < 19; j++) {allChess[i][j] = 0;}}// 另一种方式 allChess = new int[19][19];message = "黑方先行";isBlack = true;blackTime = maxTime;whiteTime = maxTime;blackMessage = maxTime / 3600 + ":"+ (maxTime / 60 - maxTime / 3600 * 60) + ":"+ (maxTime - maxTime / 60 * 60);whiteMessage = maxTime / 3600 + ":"+ (maxTime / 60 - maxTime / 3600 * 60) + ":"+ (maxTime - maxTime / 60 * 60);t.resume();this.canPlay = true;this.repaint();}}} catch (NumberFormatException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(this, "请正确输入信息!");}}// 点击游戏说明按钮if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 170&& e.getY() <= 200) {JOptionPane.showMessageDialog(this,"这个一个五子棋游戏程序，黑白双方轮流下棋，当某一方连到五子时，游戏结束。");}// 点击认输按钮if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 270&& e.getY() <= 300) {int result = JOptionPane.showConfirmDialog(this, "是否确认认输?");if (result == 0) {if (isBlack) {JOptionPane.showMessageDialog(this, "黑方已经认输,游戏结束!");} else {JOptionPane.showMessageDialog(this, "白方已经认输,游戏结束!");}canPlay = false;}}// 点击关于按钮if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 320&& e.getY() <= 350) {JOptionPane.showMessageDialog(this,"本游戏由MLDN制作，有相关问题可以访问");}// 点击退出按钮if (e.getX() >= 400 && e.getX() <= 470 && e.getY() >= 370&& e.getY() <= 400) {JOptionPane.showMessageDialog(this, "游戏结束");System.exit(0);}}public void mouseReleased(MouseEvent e) {// TODO Auto-generated method stub}private boolean checkWin() {boolean flag = false;// 保存共有相同颜色多少棋子相连int count = 1;// 判断横向是否有5个棋子相连，特点纵坐标是相同，即allChess[x][y]中y值是相同int color = allChess[x][y];/** if (color == allChess[x+1][y]) { count++; if (color ==* allChess[x+2][y]) { count++; if (color == allChess[x+3][y]) {* count++; } } }*/// 通过循环来做棋子相连的判断/** int i = 1; while (color == allChess[x + i][y + 0])* i = 1; while (color == allChess[x - i][y - 0]) if* (count >= 5) // 纵向的判断 int i2 = 1 ; int count2 = 1 ;* while (color == allChess[x + 0][y + i2]) i2 = 1;* while (color == allChess[x - 0][y - i2]) if* (count2 >= 5) // 斜方向的判断（右上 + 左下） int i3 = 1 ; int* count3 = 1 ; while (color == allChess[x + i3][y - i3]) { count3++;* i3++; } i3 = 1; while (color == allChess[x - i3][y + i3]) { count3++;* i3++; } if (count3 >= 5) // 斜方向的判断（右下 + 左上） int i4 =* 1 ; int count4 = 1 ; while (color == allChess[x + i4][y + i4]) {* count4++; i4++; } i4 = 1; while (color == allChess[x - i4][y - i4]) {* count4++; i4++; } if (count4 >= 5)*/// 判断横向count = this.checkCount(1, 0, color);if (count >= 5) {flag = true;} else {// 判断纵向count = this.checkCount(0, 1, color);if (count >= 5) {flag = true;} else {// 判断右上、左下count = this.checkCount(1, -1, color);if (count >= 5) {flag = true;} else {// 判断右下、左上count = this.checkCount(1, 1, color);if (count >= 5) {flag = true;}}}}return flag;}// 判断棋子连接的数量private int checkCount(int xChange, int yChange, int color) {int count = 1;int tempX = xChange;int tempY = yChange;while (x + xChange >= 0 && x + xChange <= 18 && y + yChange >= 0&& y + yChange <= 18&& color == allChess[x + xChange][y + yChange]) {count++;if (xChange != 0)xChange++;if (yChange != 0) {if (yChange > 0)yChange++;else {yChange--;}}}xChange = tempX;yChange = tempY;while (x - xChange >= 0 && x - xChange <= 18 && y - yChange >= 0&& y - yChange <= 18&& color == allChess[x - xChange][y - yChange]) {count++;if (xChange != 0)xChange++;if (yChange != 0) {if (yChange > 0)yChange++;else {yChange--;}}}return count;}public void run() {// TODO Auto-generated method stub// 判断是否有时间限制if (maxTime > 0) {while (true) {if (isBlack) {blackTime--;if (blackTime == 0) {JOptionPane.showMessageDialog(this, "黑方超时,游戏结束!");}} else {whiteTime--;if (whiteTime == 0) {JOptionPane.showMessageDialog(this, "白方超时,游戏结束!");}}blackMessage = blackTime / 3600 + ":"+ (blackTime / 60 - blackTime / 3600 * 60) + ":"+ (blackTime - blackTime / 60 * 60);whiteMessage = whiteTime / 3600 + ":"+ (whiteTime / 60 - whiteTime / 3600 * 60) + ":"+ (whiteTime - whiteTime / 60 * 60);this.repaint();try {Thread.sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println(blackTime + " -- " + whiteTime);}}}}

我的目的是显示背景图片，而不是使得背景图片透明，到底哪里出错？

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