JLabel刷新具有更新图像的图标 [英] JLabel refresh icon with updated image

问题描述

我正在尝试进行图像处理实验. 基本上，我有一个由计时器连续更新的图像，并在JLabel中显示该图像.

I'm trying to make an experiment in image manipulation. Basically I have an image that is continously updated by a timer and i display that image in a JLabel.

我的问题是JLabel无法刷新图像.

My problem is that JLabel does'nt refresh the image.

这是我的计时器代码:

Timer timer = new Timer(200, new ActionListener() {
        public void actionPerformed(ActionEvent e) {

            count++;

            System.out.println("timer");
            System.out.println(filename);

            ImageIcon icon = new ImageIcon(filename);

            label = new JLabel();
            label.setIcon(icon);
            label.setText(""+count);

            panel = new JPanel();
            panel.add(label);

            frame.getContentPane().removeAll();
            frame.getContentPane().add(panel);

            frame.repaint();
            frame.validate();

            try{
                FileWriter fstream;

                fstream = new FileWriter(filename,true);

                BufferedWriter out = new BufferedWriter(fstream);

                out.write("text to append");
                out.close();
            }catch (Exception ex){
                System.err.println("Error: " + ex.getMessage());
            }
        }
    });

文件名是我的图片的路径.

Where filename is path to my image.

图像已显示，但JLabel从未刷新我的图像. 我测试了我的代码，如果我在两个不同的图像之间进行夹工作，则可以正常工作.

Image is displayed but JLabel never refresh my image. I tested my code and is working if I swich between two different images...

我每次创建最后一张图片时都重复一次，并用时间戳重命名.

I solved by duplicate every time last image created and renaming with a timestamp.

推荐答案

label = new JLabel();
label.setIcon(icon);
label.setText(""+count);

panel = new JPanel();
panel.add(label);

frame.getContentPane().removeAll();
frame.getContentPane().add(panel);

frame.repaint();
frame.validate();

将所有内容替换为:

label.setIcon(icon);

如果此时标签不可见，则将其声明为外部类的类属性，或声明为与frame相同的级别(显然可以在该代码段中访问).

If the label is not visible at that point, declare it as a class attribute of the outer class or at the same level as the frame (which is obviously accessible in that snippet).

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