从文件夹中读取Java文件 [英] Reading the java files from the folder

问题描述

我开发了一个应用程序，可以从用户选择的文件夹中读取文件.它显示每个文件中有多少行代码.我只希望Java文件显示在文件选择器(扩展名为.java的文件)中.下面是我的代码:

I have developed an application that reads files from the folder chosen by the user. It displays how many lines of code are in each file. I want only Java files to be shown in the file-chooser (files having .java extension). Below is my code:

 public static void main(String[] args) throws FileNotFoundException {

        JFileChooser chooser = new JFileChooser();
        chooser.setCurrentDirectory(new java.io.File("C:" + File.separator));
        chooser.setDialogTitle("FILES ALONG WITH LINE NUMBERS");
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        chooser.setAcceptAllFileFilterUsed(false);
                if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
        {      Map<String, Integer> result = new HashMap<String, Integer>();
             File directory = new File(chooser.getSelectedFile().getAbsolutePath()); 
             int totalLineCount = 0;
             File[] files = directory.listFiles(new FilenameFilter(){
                  @Override
                  public boolean accept(File dir, String name) {
                    return name.matches("\\*\\.java");
                  }
                }
   );
              for (File file : files)
            {
                if (file.isFile())
                {    Scanner scanner = new Scanner(new FileReader(file));
                    int lineCount = 0;
                     try
                    { for (lineCount = 0; scanner.nextLine() != null; lineCount++) ;
                          } catch (NoSuchElementException e)
                    {   result.put(file.getName(), lineCount);
                    totalLineCount += lineCount;  
                                    }


                } }
              System.out.println("*****************************************");
              System.out.println("FILE NAME FOLLOWED BY LOC");
              System.out.println("*****************************************");

            for (Map.Entry<String, Integer> entry : result.entrySet())
            {   System.out.println(entry.getKey() + " ==> " + entry.getValue());
            }
            System.out.println("*****************************************");
            System.out.println("SUM OF FILES SCANNED ==>"+"\t"+result.size()); 
            System.out.println("SUM OF ALL THE LINES ==>"+"\t"+ totalLineCount);

             }  

我也进行了编辑，但是仍然无法正常工作，请告知 请建议如何仅读取扩展名为.java的文件，换句话说，请仅读取该文件夹中的java文件，请告知

I have editied also but still it is not working please advise please advise how to read only the files having .java as an extension in other words only java files from the folder ,please advise

推荐答案

您需要一个FilenameFilter.这应该为您工作:

You need a FilenameFilter. This should work for you:

FilenameFilter javaFileFilter= new FilenameFilter() {  
  @Override
  public boolean accept(File logDir, String name) {
    return name.endsWith(".java")
  }
};

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