Question

我想读取一个文件并将这些行存储在一个数组中，然后使用 JOptionPane 搜索数组并显示与指定关键字匹配的所有行。

这是我到目前为止所做的：

public class NeedleInHaystack {

  public static void main(String[] args) {
    JFileChooser jfc = new JFileChooser();
    FileNameExtensionFilter filter = new FileNameExtensionFilter("jpg", "gif","txt");
    jfc.setFileFilter(filter);
    int returnCode = jfc.showOpenDialog(null);
    if(returnCode == JFileChooser.APPROVE_OPTION); 
    File f = jfc.getSelectedFile();
       System.out.println("You chose to open this file: " +jfc.getSelectedFile().getName());

    try {
        BufferedReader data;
        String aLine;
        data = new BufferedReader(new FileReader(jfc.getSelectedFile()));
         List<String> lines = new ArrayList<String>();

         String UserInPut= JOptionPane.showInputDialog("Please enter a word in your txt");

            while((aLine = data.readLine()) != null){
                lines.add(aLine);                               
            }
             String[] stringArr = lines.toArray(new String[0]);
             for(int i=0 ; i < stringArr.length; i++){

            System.out.println(aLine);

            if (i<=15) {      //here just a example, how to do this step
                i++;
                System.out.println(stringArr[0]);
            }
             }
             data.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
  }
}

Answer 1

这可以帮到你

public static void main(String[] args) {
    JFileChooser jfc = new JFileChooser();
    FileNameExtensionFilter filter = new FileNameExtensionFilter("jpg", "gif", "txt");
    jfc.setFileFilter(filter);
    int returnCode = jfc.showOpenDialog(null);
    if (returnCode == JFileChooser.APPROVE_OPTION)
        ;
    File f = jfc.getSelectedFile();
    System.out.println("You chose to open this file: " + jfc.getSelectedFile().getName());

    try {
        BufferedReader data;
        String aLine;
        data = new BufferedReader(new FileReader(jfc.getSelectedFile()));
        List<String> lines = new ArrayList<String>();

        String UserInPut = JOptionPane.showInputDialog("Please enter a word in your txt");

        while ((aLine = data.readLine()) != null) {
            lines.add(aLine);
             // !!!Output userunput and line of file!!!
                            if (aLine.contains(UserInPut)) {
                System.out.println(UserInPut + " -> " + aLine);
            }

        }

        data.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

如何将文件行读入数组然后搜索匹配的关键字？

1 个答案: