java - 关于JFileChooser

我已经开发了一个程序，该程序计算下面显示的文件中的行数

Scanner in=new Scanner(System.in);
    System.out.println("Enter the Drive name like C,D,E etc");
    String drive=in.next();
    System.out.println("Enter the main folder name");
    String main_folder=in.next();
    File directory=new File(drive+":"+"//"+main_folder+"//");

Map<String, Integer> result = new HashMap<String, Integer>();
    //File directory = new File("C:/Test/");
    File[] files = directory.listFiles();
    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);
            } }}

    for( Map.Entry<String, Integer> entry:result.entrySet()){
          System.out.println(entry.getKey()+" ==> "+entry.getValue());
        }

但是我试图添加一个Swing接口JFilechooser，我希望该用户选择特定的文件夹，然后选择该文件夹内的所有文件，并放在上面，因为我的代码按原样工作，请告知

请建议设计jfile选择器，以便我可以集成上面的代码。

我设计了另一种解决方案是

package aa;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.FileDialog;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class FileBrowse extends JFrame {

private JButton browseSwing = new JButton("Choose File");
private JTextField textField = new JTextField(30);
private JButton approve = new JButton("Ok");


public FileBrowse() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600,80);
setResizable(false);

browseSwing.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent arg0) {
        if (arg0.getSource()==browseSwing)
        onBrowseSwing();
        }});


Container container = getContentPane();
container.setLayout(new FlowLayout());
container.add(browseSwing);
container.add(textField);
container.add(approve);

//pack();
}

protected void onBrowseSwing() {
JFileChooser fileChooser = new JFileChooser();
int result = fileChooser.showDialog(this, "Open/Save");
if (result == JFileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
textField.setText(file.toString());
String x = file.toString();
fileRead(x);
}
}

public void fileRead(String input){
    try{
        // Open the file that is the first
        // command line parameter
        FileInputStream fstream = new FileInputStream(input);
        // Get the object of DataInputStream
        DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String strLine;
        int count = 0;
        int count2 = 0;
        //Read File Line By Line
        while((strLine = br.readLine())!= null ){
            if (strLine.trim().length() != 0){
                count++;
            }else{
                count2++;
            }
        }
        System.out.println("-------Lines Of COdes-------");
        System.out.println("number of lines:" + count);
        System.out.println("number of blank lines:" + count2);
        //Close the input stream
        in.close();
        }catch (Exception e){//Catch exception if any
          System.err.println("Error: " + e.getMessage());
        }


}


public static void main(String[] args) {
new FileBrowse().setVisible(true);

}
}

但它选择单个文件，我希望在该文件夹中选择所有文件

最佳答案

您可以使用以下代码（改编自here）：

    JFileChooser chooser = new JFileChooser();
    chooser.setCurrentDirectory(new java.io.File("."));
    chooser.setDialogTitle("choosertitle");
    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(choosers.getSelectedFile().getAbsolutePath()); //This is where you need to change.
        File[] files = directory.listFiles();
        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);
                }
            }
        }

        for (Map.Entry<String, Integer> entry : result.entrySet())
        {
            System.out.println(entry.getKey() + " ==> " + entry.getValue());
        }
    }

此代码应替换本节：

Scanner in=new Scanner(System.in);
System.out.println("Enter the Drive name like C,D,E etc");
String drive=in.next();
System.out.println("Enter the main folder name");
String main_folder=in.next();
File directory=new File(drive+":"+"//"+main_folder+"//");

另外，仅作为建议，在使用控制台和系统路径时，理想情况下应使用File.seperator。这将自动为您提供相应系统的路径分隔字符。

根据您的修改，您使用的是fileChooser.getSelectedFile();。按照名称，这只会为您提供用户选择的文件。您应该使用fileChooser.getSelectedFile().getAbsolutePath()并遍历同一目录中的文件（如上所示）。

编辑2：我使用此代码来显示2个按钮及其各自的事件处理程序：

public static void main(String args[]) {
        JFrame frame = new JFrame("Button Sample");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton btnExit= new JButton("EXIT");

        ActionListener actionListenerExitButton = new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent actionEvent) {
            System.out.println("Exit Button Was Clicked");
          }
        };
        btnExit.addActionListener(actionListenerExitButton);

        JButton btnEnter = new JButton("ENTER");
        ActionListener actionListenerEnterButton = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                System.out.println("Enter Button Was Clicked");
            }
        };
        btnEnter.addActionListener(actionListenerEnterButton);

        Container contentPane = frame.getContentPane();
        contentPane.add(btnExit, BorderLayout.SOUTH);
        contentPane.add(btnEnter, BorderLayout.NORTH);
        frame.setSize(300, 100);
        frame.setVisible(true);
      }

您现在需要做的就是在适当的事件处理程序中插入我之前提供的代码。