图像文件在我的src不加载后，我编译jar, netbeans

Question

我先从我的代码开始，

    package flappyBird;
    import java.awt.Color;
    import java.awt.Font;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.Rectangle;
    import java.awt.Toolkit;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    import java.awt.image.BufferedImage;
    import java.awt.image.ImageObserver;
    import java.io.File;
    import java.io.IOException;
    import java.net.URL;
    import java.util.ArrayList;
    import java.util.Random;
    import javax.imageio.ImageIO;
    import javax.swing.ImageIcon;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.Timer;
    public class FlappyBird extends JPanel implements ActionListener,    MouseListener, KeyListener
 {

public static FlappyBird flappyBird;
public final int WIDTH = 1600, HEIGHT = 800;
public Renderer renderer;
public Rectangle bird;
public ArrayList<Rectangle> columns;
public int ticks, yMotion, score;
public boolean gameOver, started;
public Random rand;
    Image Flappy = Toolkit.getDefaultToolkit().getImage("src/flappybird/flappy.png");
    Image Icon = Toolkit.getDefaultToolkit().getImage("src/flappybird/Icon.png");
    Image Background = Toolkit.getDefaultToolkit().getImage("src/flappybird/background.jpg");
    Image Log = Toolkit.getDefaultToolkit().getImage("src/flappybird/Log.png");
    Image Grass = Toolkit.getDefaultToolkit().getImage("src/flappybird/Grass.png");

public FlappyBird()
{
    JFrame jframe = new JFrame();
    Timer timer = new Timer(20, this);
    renderer = new Renderer();
    rand = new Random(); 
    jframe.add(renderer);
    jframe.setTitle("Missle Launch");
    jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jframe.setSize(WIDTH, HEIGHT);
    jframe.addMouseListener(this);
    jframe.addKeyListener(this);
    jframe.setResizable(false);
            jframe.setIconImage(Icon);
    jframe.setVisible(true);
    bird = new Rectangle(WIDTH / 2 - 10, HEIGHT / 2 - 10, 54, 54);
    columns = new ArrayList<Rectangle>();
    addColumn(true);
    addColumn(true);
    addColumn(true);
    addColumn(true);
    timer.start();
}
public void addColumn(boolean start)
{
    int space = 250;
    int width = 100;
    int height = 50 + rand.nextInt(300);
    if (start)
    {
        columns.add(new Rectangle(WIDTH + width + columns.size() * 300, HEIGHT - height - 120, width, height));
        columns.add(new Rectangle(WIDTH + width + (columns.size() - 1) * 300, 0, width, HEIGHT - height - space));
    }
    else
    {
        columns.add(new Rectangle(columns.get(columns.size() - 1).x + 600, HEIGHT - height - 120, width, height));
        columns.add(new Rectangle(columns.get(columns.size() - 1).x, 0, width, HEIGHT - height - space));
    }
}
public void paintColumn(Graphics g, Rectangle column)
{
    g.setColor(Color.orange.darker().darker());
    g.drawImage(Log, column.x, column.y, column.width, column.height, null);
}
public void jump()
{
    if (gameOver)
    {
        bird = new Rectangle(WIDTH / 2 - 10, HEIGHT / 2 - 10, 20, 20);
        columns.clear();
        yMotion = 0;
        score = 0;
        addColumn(true);
        addColumn(true);
        addColumn(true);
        addColumn(true);
        gameOver = false;
    }
    if (!started)
    {
        started = true;
    }
    else if (!gameOver)
    {
        if (yMotion > 0)
        {
            yMotion = 0;
        }
        yMotion -= 10;
    }
}

@Override
public void actionPerformed(ActionEvent e)
{
    int speed = 10;
    ticks++;
    if (started)
    {
        for (int i = 0; i < columns.size(); i++)
        {
            Rectangle column = columns.get(i);
            column.x -= speed;
        }
        if (ticks % 2 == 0 && yMotion < 15)
        {
            yMotion += 1.5 ;
        }
        for (int i = 0; i < columns.size(); i++)
        {
            Rectangle column = columns.get(i);
            if (column.x + column.width < 0)
            {
                columns.remove(column);
                if (column.y == 0)
                {
                    addColumn(false);
                }
            }
        }

        bird.y += yMotion;
        for (Rectangle column : columns)
        {
            if (column.y == 0 && bird.x + bird.width / 4 > column.x + column.width / 2 - 10 && bird.x + bird.width / 2 < column.x + column.width / 2 + 10)
            {
                score++;
            }
            if (column.intersects(bird))
            {
                gameOver = true;
                if (bird.x <= column.x)
                {
                    bird.x = column.x - bird.width;
                }
                else
                {
                    if (column.y != 0)
                    {
                        bird.y = column.y - bird.height;
                    }
                    else if (bird.y < column.height)
                    {
                        bird.y = column.height;
                    }
                }
            }
        }
        if (bird.y > HEIGHT - 120 || bird.y < 0)
        {
            gameOver = true;
        }
        if (bird.y + yMotion >= HEIGHT - 120)
        {
            bird.y = HEIGHT - 120 - bird.height;
            gameOver = true;
        }
    }
    renderer.repaint();
}
public void repaint(Graphics g)
{
    g.drawImage(Background, 0, 0, null);
            g.drawImage(Grass, 0, 680, null);
            g.drawImage(Flappy, bird.x, bird.y, null);

    for (Rectangle column : columns)
    {
        paintColumn(g, column);
    }
    g.setFont(new Font("Arial", 1, 100));
    if (!started)
    {
                g.setColor(Color.GREEN.darker());
        g.drawString("Click to start!", 475, HEIGHT / 2 - 50);
    }
    if (gameOver)
    {
                g.setColor(Color.RED.darker());
        g.drawString("Game Over!", 500, HEIGHT / 2 - 50);
                    g.drawString("Your score was: " + String.valueOf(score), WIDTH /2 -430 , 100);
    }
    if (!gameOver && started)
    {
                g.setColor(Color.ORANGE);
        g.drawString(String.valueOf(score), WIDTH / 2 - 25, 100);
    }
}
    public void getScore() {
        String.valueOf(score);
    }
public static void main(String[] args)
{
    flappyBird = new FlappyBird();
}
@Override
public void mouseClicked(MouseEvent e)
{
    jump();
}
@Override
public void keyReleased(KeyEvent e)
{
    if (((e.getKeyCode() == KeyEvent.VK_SPACE) || e.getKeyCode() == KeyEvent.VK_UP))
    {
        jump();
    }
}
@Override
public void mousePressed(MouseEvent e)
{
}
@Override
public void mouseReleased(MouseEvent e)
{
}
@Override
public void mouseEntered(MouseEvent e)
{
}
@Override
public void mouseExited(MouseEvent e)
{
}
@Override
public void keyTyped(KeyEvent e)
{
}
@Override
public void keyPressed(KeyEvent e)
{
}
}

现在，我有我的src包，然后我的flappyBird包包含我的主类和我的图像文件，当我在编译图像之前测试游戏时，图像就在那里，但之后图像就不见了，有什么想法吗?

Answer 1

在编译和打包到JAR之后，您必须将您的文件作为资源来引用。使用ImageIO.read(InputStream)加载图像。要获取你的资源作为流，只需

FlappyBird.class.getRousourceAsStream(your/package/name/filename.extension)

当您的文件是"未完成的"时，您可以将它们称为文件，因为它们可以被本机文件系统读取。当它们进入jar时，文件系统无法直接获取这些文件。

Answer 2

在进一步预览之后，这是我找到的运行图像的代码行:

        String Background = "background.jpg";
        URL imgURL = FlappyBird.class.getResource(Background);
        Toolkit tk = Toolkit.getDefaultToolkit();
        Image bg = tk.getImage(imgURL);

这段代码用来替换:

    Image Background = Toolkit.getDefaultToolkit().getImage("src/flappybird/background.jpg");

我只是为每个人做了同样的事情，我希望这能帮助其他人看到同样的问题。

问题重复:如何使存储在主类的同一包中的图像在将其构建到.jar文件后出现?