[英]Cant read input file-Java
因此,我正在按照一系列教程來學習如何用Java制作游戲(我還是很新),我認為我完全遵循了他的代碼,但是在我運行它時仍會打印堆棧跟蹤。 這是我的代碼...
Game.java
package com.game.src.main;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.swing.JFrame;
public class Game extends Canvas implements Runnable{
private static final long serialVersionUID = 1L;
public static final int WIDTH = 320;
public static final int HEIGHT = WIDTH / 12 * 9;
public static final int SCALE = 2;
public final String TITLE = "2D Space Game";
private JFrame frame = new JFrame(TITLE);
private boolean running = false;
private Thread thread;
private BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
private BufferedImage spriteSheet = null;
private BufferedImage player;
public void init(){
BufferedImageLoader loader = new BufferedImageLoader();
spriteSheet = loader.loadImage("/sprite_sheet.png");
SpriteSheet ss = new SpriteSheet(spriteSheet);
player = ss.grabImage(1, 1, 32, 32);
}
public void run(){
long lastTime = System.nanoTime();
final double amountOfTicks = 60.0;
double ns = 1000000000 / amountOfTicks;
double delta = 0;
long now = 0;
int updates = 0, frames = 0;
long timer = System.currentTimeMillis();
init();
while(running){
now = System.nanoTime();
delta += (now - lastTime) / ns;
lastTime = now;
if(delta >= 1){
tick();
updates++;
delta--;
}
render();
frames++;
if(System.currentTimeMillis() - timer > 1000){
timer += 1000;
frame.setTitle("2-D Space Game || Updates: " + updates + ", FPS: " + frames);
frames = 0;
updates = 0;
}
}
stop();
}
private void tick(){
}
private void render(){
BufferStrategy bs = this.getBufferStrategy();
try {
Thread.sleep(2);
} catch (InterruptedException e){
e.printStackTrace();
}
if(bs == null){
createBufferStrategy(3);
return;
}
Graphics g = bs.getDrawGraphics();
/////////////////////////////////////
g.drawImage(image, 0, 0, getWidth(), getHeight(), this);
g.drawImage(player, 100, 100, this);
/////////////////////////////////////
g.dispose();
bs.show();
}
private synchronized void start(){
if(running) return;
running = true;
thread = new Thread(this);
thread.start();
}
private synchronized void stop(){
if(!running) return;
try{
thread.join();
}catch(InterruptedException e){
e.printStackTrace();
}
System.exit(1);
}
public static void main(String args[]){
Game game = new Game();
game.setPreferredSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
game.setMaximumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
game.setMinimumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
game.frame.add(game);
game.frame.pack();
game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
game.frame.setResizable(false);
game.frame.setLocationRelativeTo(null);
game.frame.setVisible(true);
game.start();
}
}
SpriteSheet.java
package com.game.src.main;
import java.awt.image.BufferedImage;
public class SpriteSheet {
private BufferedImage image;
public SpriteSheet(BufferedImage image){
this.image = image;
}
public BufferedImage grabImage(int col, int row, int width, int height){
return image.getSubimage((col * 32) - 32, (row * 32) - 32, width, height);
}
}
BufferedImageLoader.java
package com.game.src.main;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class BufferedImageLoader {
private BufferedImage image;
public BufferedImage loadImage(String path){
try {
image = ImageIO.read(getClass().getResource(path));
} catch (IOException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
return image;
}
}
現在這是顯示的堆棧跟蹤:
Exception in thread "Thread-0" java.lang.IllegalArgumentException: input == null!
at javax.imageio.ImageIO.read(ImageIO.java:1388)
at com.game.src.main.BufferedImageLoader.loadImage(BufferedImageLoader.java:13)
at com.game.src.main.Game.init(Game.java:30)
at com.game.src.main.Game.run(Game.java:45)
at java.lang.Thread.run(Thread.java:745)
有人可以幫忙嗎? 順便說一句:sprite_sheet.png確實存在
這里的問題與您處理png的方式有關,並且您指定的位置不在您的構建路徑中,也不在您希望的位置。 如果您向我提供您所在位置的pwd
,我將使用您應該使用的實際路徑進行更新
您要么需要提供完整的路徑
/home/me/myprogram/sprite_sheet.png
或使用相對路徑
./sprite_sheet.png
您的程序正在根目錄/
尋找文件
好吧,我知道了。 我的sprite_sheet.png位於我的“ res”文件夾中,我需要將其添加到構建路徑中
您需要提供相對於CLASSPATH的完整路徑,或相對於當前類的包的相對路徑。
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