Question

     if ("Analyze Text File".equals(command)) {
    JFileChooser chooser = new JFileChooser();
    chooser.setMultiSelectionEnabled(true);
    if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
        File[] files = chooser.getSelectedFiles();
        for (File file : files) {
            try {
                BufferedReader reader = new BufferedReader(new FileReader(file));
                    sb.append(line);
                }
                String text = sb.toString();
                Map<Integer, Integer> counts = getCounts(text)
                HistogramPanel panel = new HistogramPanel(width, counts, height, horizon
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

我点击“分析到文本”按钮后，我会尝试弹出JFileChooser，然后允许用户选择要处理的文本文件用我的代码输出一个条形图由于某种原因，除按钮外一切正常。如果有人可以提供帮助，我们将不胜感激。

    // Object textfile = null; 
  else if("Text".equals(command)) {
    JFileChooser chooser = new JFileChooser();
    FileNameExtensionFilter filter = new FileNameExtensionFilter(
          "txt", "text", "docx");
      chooser.setFileFilter(filter);
 int returnVal = JFileChooser.showOpenDialog(null);
       if (returnVal == JFileChooser.APPROVE_OPTION) {
           File file = JFileChooser.getSelectedFile();
           Map<Integer, Integer> counts = getCounts(Stext);
           int width = counts.size() * BAR
           int horizon = height - 25;
           HistogramPanel panel = new HistogramPanel(width, counts, height, horizon);

       }
   }
   }

Answer 1

“一旦我点击”分析到文字“按钮，”

也许actionCommand不是"Text"，你应该检查"Analyze to text"

if ("Text".equals(command)) {→if ("Analyze to Text".equals(command)) {

// or whatever the text/actionCommand of your button is

另一个看似显而易见的问题是，您已宣布JFileChooser chooser，但您尝试访问filechooser

<强>更新

使用此代码。更改按钮文本。如果它不起作用，那么你在代码中改变了其他内容，我无能为力，因为这对我来说很好。

    if ("Analyze Text File".equals(command)) {
        JFileChooser chooser = new JFileChooser();
        int result = chooser.showOpenDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            try {
                File file = chooser.getSelectedFile();
                BufferedReader reader = new BufferedReader(new FileReader(file));
                StringBuilder sb = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    sb.append(line);
                }
                String text = sb.toString();
                Map<Integer, Integer> counts = getCounts(text);
                int width = counts.size() * BAR_WIDTH;
                int max = maxCount(counts);
                int height = max * INCREMENT + 100;
                int horizon = height - 25;
                HistogramPanel panel = new HistogramPanel(width, counts, height, horizon);
                JOptionPane.showMessageDialog(null, panel);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

Java Applet JFileChooser按钮问题？

1 个答案: