ImageIcon方法无限循环

时间：2020-01-15 16:21:21

标签： java swing imageicon

我正在开发一个Java swing应用程序，在该应用程序中，我试图为国际象棋棋子加载图像，并且一切工作得很好，直到突然之间，我收到错误消息：

Exception in thread "main" java.lang.StackOverflowError
    at java.base/java.lang.String.indexOf(String.java:1612)
    at java.base/java.lang.String.indexOf(String.java:1569)
    at java.base/java.net.URLStreamHandler.parseURL(URLStreamHandler.java:151)
    at java.base/sun.net.www.protocol.file.Handler.parseURL(Handler.java:67)
    at java.base/java.net.URL.<init>(URL.java:696)
    at java.base/java.net.URL.<init>(URL.java:563)
    at java.base/jdk.internal.loader.URLClassPath$FileLoader.getResource(URLClassPath.java:1222)
    at java.base/jdk.internal.loader.URLClassPath$FileLoader.findResource(URLClassPath.java:1211)
    at java.base/jdk.internal.loader.URLClassPath.findResource(URLClassPath.java:294)
    at java.base/jdk.internal.loader.BuiltinClassLoader.findResourceOnClassPath(BuiltinClassLoader.java:499)
    at java.base/jdk.internal.loader.BuiltinClassLoader.findResource(BuiltinClassLoader.java:323)
    at java.base/java.lang.ClassLoader.getResource(ClassLoader.java:1400)
    at java.base/java.lang.Class.getResource(Class.java:2741)
    at model.Board.getImageIcon(Board.java:246)
    at model.Board.setBoard(Board.java:49)
    at model.Board.<init>(Board.java:37)
    at model.Board.getBoardInstance(Board.java:28)
    at controler.FigureAction.<init>(FigureAction.java:15)
    at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)

，并且at model.Board.setBoard(Board.java:49)中的部分之后（仅该部分）被记录了很多次。 在调试错误时，我看到它反复输入相同的方法，直到发生堆栈溢出错误为止。在那里，我正在从本地地址检索图像。 方法如下：

private ImageIcon getImageIcon(String path,String description) {
        URL imgURL = getClass().getResource(path);
        if (imgURL != null) {
            Image ii=new ImageIcon(imgURL, description).getImage().getScaledInstance(70, 70, Image.SCALE_SMOOTH);
            ImageIcon im=new ImageIcon(ii);
            return im;

        } 
        else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

它叫做

public void setBoard(Color c1,Color c2,Dimension dim) {

        for(int i=0;i<8;i++) {
            for(int j=0;j<8;j++) {
                Point point=new Point(i,j);
                if ((i+j)%2==0) {
                    if(i==0 && j==0) {
                        ***Figure f=new Figure (null,null,"white_rook",null,getImageIcon("/images/WhiteRook.png",null));***
                        fields[i][j]=new Field(c1,new Position(point.x,point.y),i*8+j,f);
                        f.field=fields[i][j];
                        f.pos=new Position(point.x,point.y);
                        fields[i][j].add(f);
                        figures[i][j]=f;
                    }

是方法setBoard的一部分，基本上将每个部分放在字段上。图类看起来像：

public class Figure extends JPanel {

    public Field field;
    public Color color;
    public String name;
    public Movement movement;
    public ImageIcon imageIcon;
    public Position pos;

    public Figure(Field field, Color color, String name, Movement movement, ImageIcon icon) {
        this.field = field;
        this.color = color;
        this.name = name;
        this.movement = movement;
        this.imageIcon = icon;
        this.setPreferredSize(new Dimension(70, 70));
        this.addMouseMotionListener(new FigureAction());
        this.addMouseListener(new FigureAction());
        this.setBackground(null);


    }
}

在这里，我正在从png图像制作缩放后的imageIcon并将其取回。如果有人能够告诉我可能是什么问题，我将不胜感激。我想我在这里错过了一些重要的事情，但目前不知道该去哪里看看。.预先感谢。

2 个答案:

答案 0 :(得分：2)

第一个getClass()实际上可能是一个子类，因此为了有条理：

    URL imgURL = Board.class.getResource(path);

然后，优化内存使用率和速度。我在这里忽略了描述。

Map<String, ImageIcon> sharedIcons = new HashMap<>();

private ImageIcon getImageIcon(String path, String description) {
    ImageIcon icon = sharedIcons.get(path);
    if (icon == null) {
        URL imgURL = getClass().getResource(path);
        if (imgURL == null) {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
        icon = new ImageIcon(imgURL, description);
        Image ii = new ImageIcon(imgURL, description)
                .getImage().getScaledInstance(70, 70, Image.SCALE_SMOOTH);
        icon = new ImageIcon(ii);

        sharedIcons.put(path, icon);
    }
    return icon;
}

检查是否没有递归。 FigureAction呼叫setBoard左右。

答案 1 :(得分：1)

根据您提供的堆栈跟踪和代码：

$bucketAuto

这意味着：

  1. at model.Board.setBoard(Board.java:49) at model.Board.<init>(Board.java:37) at model.Board.getBoardInstance(Board.java:28) at controler.FigureAction.<init>(FigureAction.java:15) at model.Figure.<init>(Figure.java:30) 构造函数被调用。
  2. 然后调用Figure构造函数。
  3. 然后，在之后的某个时刻，调用FigureAction。
  4. 但是Board.setBoard在刚刚用3个星号突出显示的行中再次调用Board.setBoard构造函数...

为了解决这个问题，这取决于您要实现的目标。这意味着，如果您希望我们尝试解决它，我们甚至需要更多代码来查看（例如MRE）。

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