要将文本读取到Java的文本编辑框中,可以使用Swing框架中的JTextArea组件。以下是一个示例代码:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileReader;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.filechooser.FileNameExtensionFilter;
public class FileReadExample extends JFrame {
private JTextArea textArea;
private JButton openButton;
public FileReadExample() {
textArea = new JTextArea();
openButton = new JButton("Open File");
openButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser fileChooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("Text files", "txt");
fileChooser.setFileFilter(filter);
int returnValue = fileChooser.showOpenDialog(null);
if (returnValue == JFileChooser.APPROVE_OPTION) {
try {
FileReader fileReader = new FileReader(fileChooser.getSelectedFile());
BufferedReader reader = new BufferedReader(fileReader);
String line;
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
reader.close();
textArea.setText(sb.toString());
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "Error reading file: " + ex.getMessage());
}
}
}
});
JPanel buttonPanel = new JPanel();
buttonPanel.add(openButton);
JScrollPane scrollPane = new JScrollPane(textArea);
getContentPane().add(buttonPanel, BorderLayout.NORTH);
getContentPane().add(scrollPane, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 300);
setVisible(true);
}
public static void main(String[] args) {
new FileReadExample();
}
}
运行以上代码,将会显示一个窗口,点击"Open File"按钮可以选择要读取的文本文件,然后将文件内容显示在文本编辑框中。