java NetBeans，正在尝试从中读取。带有扫描仪的txt文件，FileNotFoundException

Question

我试图在NetBeans IDE中使用扫描仪从文本文件中读取字符以填充对象数组。游戏的所有文件都位于同一文件夹src/wizard/game中。下面是我的游戏面板。java类，删除了除相关代码以外的所有内容：

public class GamePanel extends JPanel
{
    boolean instantiated;

    public GamePanel() {
        spaces = new Entity[width][height];
        // Tell whether entities have been instantiated yet or not
        instantiated = false;
    }

    // *** Interfacing methods ***
    // Instatntiate entites in a level from a text file
    public static void loadLevel(String l) throws FileNotFoundException {
        File level = new File(l);
        Scanner s = new Scanner(level);
        for(int y=1; y<=GamePanel.getH(); y++) {
            for(int x=1; x<=GamePanel.getW(); x++) {
                String nextIdentifier = s.next();
                switch(nextIdentifier) {
                    case("x"):
                        // Nothing
                        break;
                    case("s"):
                        new WallSandstone(x, y);
                        break;
                }
            }
        }
    }

    @Override
    public void paintComponent(Graphics g)
    {
        // Instantiate entities here only once
        while(instantiated == false){
            try {
                loadLevel("levelOne.txt");
            } catch (FileNotFoundException ex) {
                Logger.getLogger(GamePanel.class.getName()).log(Level.SEVERE, null, ex);
            }

            instantiated = true;
        }
    }
}

还有一级。txt文件：

x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x s s s s s s s s s s s s s x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x s x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x s s s s s s x s s s s s s x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
s s s s s s s s s s s s s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
x x x x x x x x x x x x s x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x

运行此代码会出现以下错误：

SEVERE: null
java.io.FileNotFoundException: levelOne.txt (The system cannot find the file specified)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.util.Scanner.<init>(Scanner.java:611)
    at wizard.game.GamePanel.loadLevel(GamePanel.java:65)
    at wizard.game.GamePanel.paintComponent(GamePanel.java:97)
    at javax.swing.JComponent.paint(JComponent.java:1056)

我做错什么了吗？我一辈子都搞不明白为什么这不管用

Answer 1

尝试加载文件时，可以尝试使用以下代码：

ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("levelOne.txt").getFile());

如果没有指定包，它将查找fileOne。txt文件从类路径的根文件夹开始

ie .. |-/GamePanel.java
      |-/levelOne.txt