Question

我刚开始用java编程。然而，最近我无法将图像加载到我的游戏中。

我已经尝试将它们加载到一个单独的资源包中并阅读/观看了无数的教程，但似乎没有任何工作！

有人能告诉我代码有什么问题或提供任何建议吗？任何帮助将非常感激。

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;

public class Main extends JFrame{

Image dbImage;
Graphics dbg;

//Variables for screen size
int
GWIDTH = 800,
GHEIGHT = 500;

//Dimension of gwidth and gheight
Dimension screenSize = new Dimension (GWIDTH, GHEIGHT);

public Main (){
//constructor to spawn window
this.setTitle ("Pond");
this.setSize(screenSize);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setBackground(Color.cyan);
this.addKeyListener(new AL ());
ImageIcon img = new ImageIcon (getClass().getResource("/resources/ninja-png.gif"));

}

 public static void main (String[] args){

 Main m = new Main ();
 }

 //Double Buffering
  @Override

   public void paint (Graphics g){

dbImage = createImage (getWidth(), getHeight());
dbg = dbImage.getGraphics ();
draw (dbg);
g.drawImage(dbImage, 0, 0, this);  

 }

 public void draw (Graphics g){
 }
 public void paintComponent (Graphics g){
 }
 //Event Listener Class
 public class AL extends KeyAdapter {
@Override
public void keyPressed (KeyEvent e){
}
@Override
public void keyReleased (KeyEvent e){
 }
 }

  }

Answer 1

“有人可以告诉我代码有什么问题或提供任何建议吗？”

不要在JFrame等顶级容器上绘画。
改为使用JPanel并覆盖其paintComponent方法并致电super.paintComponent
@Override getPreferredSize()在绘画时JPanel，因此面板将具有优先大小。
请致电frame.pack()而不是设置尺寸，并且会尊重JPanel的首选尺寸。
将自定义绘画面板添加到JFrame。
您从未初始化您尝试绘制的图像。这样做。
```
dbImage = new ImageIcon(getClass().getResource("/resources/stackoverflow5.png")).getImage();
```
声明您永远不会使用的新ImageIcon。

从Event Dispatch Thread像这样运行Swing应用

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable(){
        @Override
        public void run() {
            Main m = new Main();
        }
    });
}

确保您在src中直接拥有资源包
```
Project
      src
         resources
```

enter image description here

完整重构的源代码所有上述内容。

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class Main extends JFrame {

    Image dbImage;

    int GWIDTH = 800;
    int GHEIGHT = 500;

    public Main() {
        dbImage = new ImageIcon(getClass().getResource("/resources/stackoverflow5.png")).getImage();
        this.setTitle("Pond");
        add(new ImagePanel());
        this.pack();
        this.setResizable(false);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
        this.setBackground(Color.cyan);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                Main m = new Main();
            }
        });
    }

    public class ImagePanel extends JPanel {

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);

            g.drawImage(dbImage, 0, 0, GWIDTH, GHEIGHT, this);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(GWIDTH, GHEIGHT);
        }
    }
}

Answer 2

我相信有一种更简单的方法：创建一个JLabel并将其添加到框架中：

BufferedImage bi = ImageIO.read(/*This uses a URL*/new URL(YOURURLHERE));
ImageIcon image = new ImageIcon(bi);
JLabel label = new JLabel(image);

然后只需将该标签添加到框架中。

将图像加载到Java中

2 个答案: