在指定目录启动JFileChooser并仅显示特定类型的文件 [英] Starting a JFileChooser at a specified directory and only showing files of a specific type

问题描述

我有一个使用JFileChooser的程序。简而言之，完整的程序是一个GUI，允许用户操纵PNG和JPG。我想这样做，以便JFileChooser立即打开图片目录（窗口）。当用户打开他们的JFileChooser时，它会直接打开图片库C：\ Users \（USER）\ Pictures

I have a program utilizing a JFileChooser. To be brief, the full program is a GUI which allows users to manipulate PNGs and JPGs. I would like to make it so that the JFileChooser instantly opens to the picture directory (windows). When the user opens their JFileChooser, it would open directly to the pictures library C:\Users\(USER)\Pictures

此外，它会很好仅显示特定类型的文件（PNG和JPG）。许多程序似乎能够做到这一点;只允许选择特定文件。 JFileChooser是否允许这样的事情？目前，我正在使用一种大规模不可靠的运行方法来拒绝非PNG / JPG。

Furthermore, it would be nice to ONLY show files of a specific type (PNGs and JPGs). Many programs seem to be able to do this; only allowing selection of specific files. Does JFileChooser allow such a thing? Currently, I am using a massively unreliable, run around method to reject non-PNGs/JPGs.

以下是指GUI的浏览按钮，其中用户将选择他们的图片进行编辑，它将在屏幕上显示。

The following refers to the "browse" button of the GUI, in which a user will select their picture for editing and it will display it on the screen.

    try {
       int val = filec.showOpenDialog(GridCreator.this);
       if(val==JFileChooser.APPROVE_OPTION) {
          File unfiltered_picture = filec.getSelectedFile();
          //get the extension of the file
          extension=unfiltered_picture.getPath();
          int index=extension.indexOf(".");
          extension=extension.substring(index+1, extension.length());
          //if the file is not jpg, png, or jpeg, reject it and send a message to the user.
          if(!extension.matches("[jJ][pP][gG]") && !extension.matches("[pP][nN][gG]") && !extension.matches("[jJ][pP][eE][gG]")) {
             JOptionPane.showMessageDialog(null,
                                           "cannot load file. File must be of type png, jpeg, or jpg. \n Your file is of type " + extension,
                                            "Error: improper file",
                                            JOptionPane.OK_OPTION);
           //if the file is of the proper type, display it to the user on the img JLabel.
           } else {
              finalImage = ImageIO.read(unfiltered_picture);
              ImageIcon imgIcon = new ImageIcon();
              imgIcon.setImage(finalImage);
              img.setIcon(imgIcon);
              img.invalidate();
              h_divide.setValue(0);
              v_divide.setValue(0);
           }
       }
   } catch(IOException exception) {
        exception.printStackTrace();
   }

谢谢。

推荐答案

您需要使用要启动的目录构建 JFileChooser ，然后传递 FileFilter设置可见之前进入它。

You need to construct your JFileChooser with the directory you want to start in and then pass a FileFilter into it before setting visible.

    final JFileChooser fileChooser = new JFileChooser(new File("File to start in"));
    fileChooser.setFileFilter(new FileFilter() {
        @Override
        public boolean accept(File f) {
            if (f.isDirectory()) {
                return true;
            }
            final String name = f.getName();
            return name.endsWith(".png") || name.endsWith(".jpg");
        }

        @Override
        public String getDescription() {
            return "*.png,*.jpg";
        }
    });
    fileChooser.showOpenDialog(GridCreator.this);

此示例过滤以.png或.jpg结尾的文件。

This example filters for files ending in ".png" or ".jpg".

这篇关于在指定目录启动JFileChooser并仅显示特定类型的文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！