我使用eclipse将我的项目导出为可运行的jar文件，当我尝试运行时没有任何反应，当我使用cmd运行它时，我得到了这个错误。
C:\Users\Enes\Desktop>cmd.exe
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Enes\Desktop>java -jar Game.Jar
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa
der.java:58)
Caused by: java.lang.NullPointerException
at scrolls.Resources.createArray(Resources.java:111)
at scrolls.Player.<init>(Player.java:31)
at scrolls.Draw.<init>(Draw.java:27)
at scrolls.Frame.main(Frame.java:18)
... 5 more
C:\Users\Enes\Desktop>
当我使用eclipse运行它时，运行正常，没有错误或警告。
这是我的资源文件，似乎在第111行造成了问题
package scrolls;
import java.awt.Font;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.imgscalr.Scalr;
public class Resources
{
Map map;
static BufferedImage[] textures = new BufferedImage[8];
static BufferedImage[] mapTextures = new BufferedImage[9];
static BufferedImage texture;
static BufferedImage[] waterAnimated = new BufferedImage[64];
static BufferedImage water;
static BufferedImage icon;
public static Font f, fs;
static int imageCounter = 0;
public Resources()
{
map = new Map();
textures();
createArray(texture, textures, 32, 1, 8);
createArray(water, waterAnimated, 32, 64, 1);
getFont();
buildMapTextures(textures, mapTextures);
}
public static void counter()
{
imageCounter++;
if (imageCounter >= 500)
imageCounter = 0;
//System.out.println(imageCounter / 8);
}
private void buildMapTextures(BufferedImage[] textures, BufferedImage[] mapTextures)
{
for (int i = 0; i <= 7; i++)
{
mapTextures[i] = resize(textures[i], 3, 3);
}
mapTextures[8] = resize(waterAnimated[2], 3, 3);
}
private BufferedImage resize(BufferedImage image, int newW, int newH)
{
BufferedImage thumbnail = Scalr.resize(image, Scalr.Method.ULTRA_QUALITY, Scalr.Mode.FIT_EXACT, newW, newH, Scalr.OP_ANTIALIAS);
return thumbnail;
}
public static BufferedImage waterAnimation()
{
return waterAnimated[imageCounter / 8];
}
private void textures()
{
try
{
texture = ImageIO.read(new File("src/resources/textures.png"));
} catch (IOException e)
{
}
try
{
water = ImageIO.read(new File("src/resources/water.png"));
} catch (IOException e)
{
}
try
{
icon = ImageIO.read(new File("src/resources/icon.png"));
} catch (IOException e)
{
}
}
static BufferedImage player()
{
BufferedImage player = null;
try
{
player = ImageIO.read(new File("src/resources/player.png"));
} catch (IOException e)
{
}
return player;
}
static void createArray(BufferedImage image, BufferedImage[] images, int size, int rows, int cols)
{
BufferedImage temp = image;
for (int i = 0; i < rows; i++)
{
for (int j = 0; j < cols; j++)
{
images[(i * cols) + j] = temp.getSubimage(j * size, i * size, size, size); // line 111
}
}
}
public static void readLevel(String filename, int[][] level, int part)
{
try
{
File f = new File("src/resources/levels/" + part + "/" + filename + ".txt");
FileReader fr = new FileReader(f);
BufferedReader in = new BufferedReader(fr);
StringBuilder sb = new StringBuilder();
byte b = 0;
while ((b = (byte) in.read()) != -1)
{
sb.append("" + ((char) b));
}
String str = sb.toString();
String[] lines = str.split("(\n|\r)+");
for (int i = 0; i < lines.length; i++)
{
for (int j = 0; j < lines[i].length(); j++)
{
level[i][j] = Integer.parseInt("" + lines[i].charAt(j));
}
}
in.close();
} catch (Exception e)
{
e.printStackTrace();
}
}
private static void getFont()
{
try
{
f = Font.createFont(Font.TRUETYPE_FONT, new FileInputStream("src/resources/Jet Set.ttf"));
fs = Font.createFont(Font.TRUETYPE_FONT, new FileInputStream("src/resources/Jet Set.ttf"));
} catch (Exception e)
{
System.out.println(e);
}
f = f.deriveFont(22f);
fs = fs.deriveFont(13f);
}
}
玩家代码
package scrolls;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Transparency;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
public class Player
{
static int x, y, dx, dy;
BufferedImage[] sprites = new BufferedImage[8];
int rotation = 0;
int imageCounter = 0;
public static boolean moving = false;
static int playerEnergy = 150000;
static int playerLvl = 1;
static int playerExp = 3;
static int expNeeded = (((playerLvl + 1) * playerLvl) * 2);
static int playerHealth = 100;
static int playerMana = 100;
static int mapRow = 6;
static int mapColumn = 8;
static int playerRow, playerColumn;
public Player()
{
y = 40;
x = 700;
Resources.createArray(Resources.player(), sprites, 66, 1, 8);
}
private void changeImage()
{
imageCounter++;
if (imageCounter >= 80)
imageCounter = 0;
}
public void move()
{
y = y + dy;
x = x + dx;
changeImage();
playerPosition();
}
static void mapPosition()
{
if (y < 0)
playerRow = 0;
else
playerRow = (y / 32) + 1;
if (x < 0)
playerColumn = 0;
else
playerColumn = (x / 32) + 1;
}
private void playerPosition()
{
if (x >= 817 - 59)
{
x = -24;
mapColumn++;
}
if (x <= -25)
{
x = 817 - 59;
mapColumn--;
}
if (y <= -25)
{
y = 599 - 152 - 41;
mapRow--;
}
if (y >= 599 - 152 - 40)
{
y = -24;
mapRow++;
}
}
public static int playerExp()
{
return playerExp;
}
public static int getNextExp()
{
return expNeeded;
}
public static int playerLvl()
{
if (playerExp >= expNeeded)
{
playerLvl++;
}
return playerLvl;
}
public static int playerHealth()
{
return playerHealth;
}
public static int playerMana()
{
return playerMana;
}
public static int playerEnergy()
{
if ((dx != 0) || (dy != 0))
playerEnergy--;
if ((dx != 0) && (dy != 0))
playerEnergy--;
return playerEnergy;
}
public int getX()
{
return x;
}
public int getY()
{
return y;
}
public static BufferedImage rotate(BufferedImage image, double angle)
{
double sin = Math.abs(Math.sin(angle)), cos = Math.abs(Math.cos(angle));
int w = image.getWidth(), h = image.getHeight();
int neww = (int) Math.floor(w * cos + h * sin), newh = (int) Math.floor(h * cos + w * sin);
GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
BufferedImage result = gc.createCompatibleImage(neww, newh, Transparency.TRANSLUCENT);
Graphics2D g = result.createGraphics();
g.translate((neww - w) / 2, (newh - h) / 2);
g.rotate(angle, w / 2, h / 2);
g.drawRenderedImage(image, null);
g.dispose();
return result;
}
public BufferedImage getPlayerImage()
{
roatePlayer();
int image = animatePlayer();
double angle = Math.toRadians(rotation);
if (dy != 0 || dx != 0)
{
return rotate(sprites[image], angle);
}
return rotate(sprites[0], angle);
}
private int animatePlayer()
{
return imageCounter / 10;
}
private void roatePlayer()
{
if (dy > 0)
rotation = 0;
if (dy < 0)
rotation = 180;
if (dx > 0)
rotation = -90;
if (dx < 0)
rotation = 90;
if (dy > 0 && dx > 0)
rotation = -45;
if (dy > 0 && dx < 0)
rotation = 45;
if (dy < 0 && dx < 0)
rotation = 135;
if (dy < 0 && dx > 0)
rotation = -135;
}
public void keyPressed(KeyEvent e)
{
int key = e.getKeyCode();
if (key == KeyEvent.VK_A)
{
dx = -1;
rotation = -90;
}
if (key == KeyEvent.VK_S)
{
dy = 1;
rotation = 0;
}
if (key == KeyEvent.VK_D)
{
dx = 1;
rotation = 90;
}
if (key == KeyEvent.VK_W)
{
dy = -1;
rotation = 180;
}
}
public void keyReleased(KeyEvent e)
{
int key = e.getKeyCode();
if (key == KeyEvent.VK_A)
dx = 0;
if (key == KeyEvent.VK_S)
dy = 0;
if (key == KeyEvent.VK_D)
dx = 0;
if (key == KeyEvent.VK_W)
dy = 0;
}
}
答案 0 :(得分：7)
我强烈怀疑你是通过假设它们作为文件存在来加载一些资源（声音，图像），或者你正在使用适当的getResource / {{ 1}}调用，但您的资源不存在于jar文件中。如果没有看到任何代码或jar文件中的内容，我们无法确定，但您应该检查加载资源的位置，以及您希望找到资源的原因。
哦，你可能也有一个套管问题 - 当它从Windows文件系统加载资源时，即使文件被调用getResourceAsStream，要求FOO.PNG也能正常工作;从jar文件加载资源时， not 为true。
当然，您应该查看foo.png第111行和Resources.java第31行，以帮助准确确定出现了什么问题（例如哪个资源失败）。
编辑：好的，既然我们已经获得了代码，那么就像我最初建议的那样 。 Player.java中的这行代码：
Resource.player() ...正在加载player = ImageIO.read(new File("src/resources/player.png"));
，希望它是本地文件系统上的文件。你想要这样的东西：
player.png顺便说一句，在jar文件中有一个player = ImageIO.read(Resource.class.getResource("/src/resources/player.png"));
文件夹很奇怪。如果您实际上只是将图像放在src目录中，您需要：
reources