Java将图像从文件读入ArrayList并显示在JPanel上
我试着把一个满是图像的文件读入ArrayList,制作一副卡片。然后在JPanel上显示它。这是我的密码:Java将图像从文件读入ArrayList并显示在JPanel上,java,swing,user-interface,jlabel,imageicon,Java,Swing,User Interface,Jlabel,Imageicon,我试着把一个满是图像的文件读入ArrayList,制作一副卡片。然后在JPanel上显示它。这是我的密码: private static class CardDealer extends JFrame { private ImageIcon[] cards = new ImageIcon[52]; private ArrayList<ImageIcon> deck = new ArrayList<ImageIcon>();
private static class CardDealer extends JFrame
{
private ImageIcon[] cards = new ImageIcon[52];
private ArrayList<ImageIcon> deck = new ArrayList<ImageIcon>();
private JButton deal;
private JPanel faceDown, faceUp, button;
private JLabel backs, fronts;
private Random card = new Random(52);
public CardDealer() throws FileNotFoundException
{
File images = new File("src/Images");
Scanner file = new Scanner(images);
for(int i=0; i<cards.length; i++)
{
cards[i] = new ImageIcon(Arrays.toString(images.list()));
deck.add(cards[i]);
}
//setTitle to set the title of the window
setTitle("Card Dealer");
//set the application to close on exit
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Call all our build panel methods
buildButtonPanel();
buildFaceDownPanel();
buildFaceUpPanel();
setLayout(new BorderLayout());
add(button, BorderLayout.SOUTH);
add(faceDown, BorderLayout.WEST);
add(faceUp, BorderLayout.EAST);
pack();
validate();
setVisible(true);
}
private void buildButtonPanel()
{
button = new JPanel();
deal = new JButton("Deal");
deal.addActionListener(new buttonListener());
button.add(deal);
}
private void buildFaceDownPanel()
{
faceDown = new JPanel();
backs = new JLabel();
backs.setText("Cards");
backs.setIcon(new ImageIcon("Blue.bmp"));
faceDown.add(backs);
}
private void buildFaceUpPanel()
{
faceUp = new JPanel();
fronts = new JLabel();
faceUp.add(fronts);
}
private class buttonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
fronts.setIcon(deck.get(card.nextInt()));
}
}
}
public static void main(String[] args) throws FileNotFoundException
{
new CardDealer();
}
私有静态类CardDealer扩展JFrame
{
私有ImageIcon[]卡=新ImageIcon[52];
private ArrayList deck=new ArrayList();
私人杰布顿交易;
私人JPanel面朝下,面朝上,按钮;
私用JLabel背部、前部;
私人随机卡=新随机卡(52);
公共卡经销商()抛出FileNotFoundException
{
文件图像=新文件(“src/images”);
扫描仪文件=新扫描仪(图像);
对于(int i=0;iLets start withFile#list
将返回包含在指定文件位置内的File
对象数组,这使得
cards[i] = new ImageIcon(Arrays.toString(images.list()));
非常令人担忧的原因有两个,除了简单地将文件列表转换为字符串
,这样做卡片。长度
效率极低
接下来,您不应该在代码中的任何路径中引用src
,一旦构建和打包,src
将不再存在,并且您将无法像普通文件一样访问“文件”(因为它们可能嵌入到jar文件中)
这引发了另一个问题,因为列出嵌入到jar文件中的资源并不容易(当您甚至不知道jar文件的名称时),您需要一种不同的方法
一种可能是以常见的顺序方式命名图像,例如/images/Card0.png
,/images/Card1.png
,然后通过循环加载图像
File images = new File("src/Images");
for(int i=0; i < cards.length; i++)
{
cards[i] = new ImageIcon(
ImageIO.read(
getClass().getResource("/images/Card" + i + ".png")));
deck.add(cards[i]);
}
File images=新文件(“src/images”);
对于(int i=0;i
有关读取/加载图像的更多详细信息,请参阅
另一个解决方案可能是创建一个文本文件,该文件可以存储在应用程序上下文中,列出所有卡片名称。您可以使用Class#getResource
或Class#getResourceAsStream
加载文件,读取其内容并加载每个图像…两件事,永远不要在任何路径中引用src
,其次,一旦图像存储在应用程序目录中,您将无法再像读取普通文件一样读取它们