我的项目中有一个图像文件。层次结构如下所示:
我正在尝试使用以下代码将Manling.png读入Manling.java:
public BufferedImage sprite;
public Manling()
{
try
{
File file = new File("resources/Manling.png");
sprite = ImageIO.read(file);
} catch (IOException e) {}
System.out.println(sprite.toString()); //This line is to test if it works
}
我总是在
NullPointerException
语句上得到一个println
,所以我认为路径是错误的。我尝试将图片移到项目中的其他位置,并尝试更改文件路径(例如'mine/resources/Manling.png'和'/resources/Manling.png')。有任何想法吗?如果您想要一个完整的可编译示例,请尝试以下示例:
package minesscce;
import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import java.net.URL;
public class Mine extends JFrame
{
private BufferedImage sprite;
public static void main(String args[])
{
Mine mine = new Mine();
}
public Mine()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setSize(800, 600);
setExtendedState(Frame.MAXIMIZED_BOTH);
setBackground(Color.WHITE);
try
{
File file = new File("resources/Manling.png");
sprite = ImageIO.read(file);
} catch (IOException e) {}
System.out.println(sprite.toString());
}
public void paint(Graphics g)
{
g.translate(getInsets().left, getInsets().top);
Graphics2D g2d = (Graphics2D)g;
g2d.drawImage(sprite, 0, 0, this);
Toolkit.getDefaultToolkit().sync();
g2d.dispose();
}
}
只需使用所需的任何图像,像这样设置项目:
最佳答案
尝试
ImageIO.read(Mine.class.getResource("../minesscce.resources/Manling.png"));
这是一个例子:
这是代码 ...
public final class ImageResourceDemo {
private static BufferedImage bi;
public static void main(String[] args){
try {
loadImage();
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
createAndShowGUI();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
private static void loadImage() throws IOException{
bi = ImageIO.read(
ImageResourceDemo.class.getResource("../resource/avatar6.jpeg"));
}
private static void createAndShowGUI(){
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.WHITE);
frame.add(new JLabel(new ImageIcon(bi)));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}