import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.text.BadLocationException;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import java.awt.CardLayout;
import javax.swing.JSplitPane;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.awt.event.ActionEvent;
import javax.swing.JEditorPane;
import java.awt.Color;
import java.awt.Font;
import javax.swing.DropMode;
import javax.swing.JScrollBar;
import javax.swing.SwingConstants;
public class Program extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JTextField textField_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Program frame = new Program();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*
* @throws BadLocationException
*/
public Program() throws BadLocationException {
double points = 0;
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(0, 0, 1200, 760);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JEditorPane dtrpnTypeTextHere = new JEditorPane();
dtrpnTypeTextHere.setContentType("type/normal");
dtrpnTypeTextHere.setToolTipText("");
dtrpnTypeTextHere.setFont(new Font("Arial", Font.PLAIN, 16));
dtrpnTypeTextHere.setForeground(Color.GREEN);
dtrpnTypeTextHere.setBackground(Color.BLACK);
dtrpnTypeTextHere.setBounds(10, 23, 1152, 671);
contentPane.add(dtrpnTypeTextHere);
int length = dtrpnTypeTextHere.getDocument().getLength();
String text = dtrpnTypeTextHere.getDocument().getText(0, length);
JLabel lblNewLabel = new JLabel("Power Text Editor");
lblNewLabel.setBackground(Color.BLACK);
lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
lblNewLabel.setForeground(Color.GREEN);
lblNewLabel.setBounds(515, 0, 125, 14);
contentPane.add(lblNewLabel);
JLabel lblFileName = new JLabel("File Name:");
lblFileName.setBounds(660, 703, 75, 14);
contentPane.add(lblFileName);
JButton btnFinishEditing = new JButton("Finish editing");
btnFinishEditing.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
BufferedWriter writer = null;
try {
//create a temporary file
File logFile = new File("yas.txt");
// This will output the full path where the file will be written to...
System.out.println(logFile.getCanonicalPath());
writer = new BufferedWriter(new FileWriter(logFile));
writer.write(text);
} catch (Exception e1) {
e1.printStackTrace();
} finally {
try {
// Close the writer regardless of what happens...
writer.close();
} catch (Exception e1) {
}
System.out.println("Quit because of user exit");
System.exit(0);
}
}
});
btnFinishEditing.setForeground(Color.GREEN);
btnFinishEditing.setBackground(Color.BLACK);
btnFinishEditing.setBounds(532, 699, 108, 23);
contentPane.add(btnFinishEditing);
textField_1 = new JTextField();
textField_1.setBounds(726, 700, 131, 20);
contentPane.add(textField_1);
textField_1.setColumns(10);
}
}
有代码，我在制作文件时遇到问题，当我输入内容时，它在文件中显示为空白。
答案 0 :(得分：2)
您正在事件驱动环境中运行，这意味着在创建组件和显示UI以及发生的事情之间，时间已经过去。
这意味着当你做某事......
JEditorPane dtrpnTypeTextHere = new JEditorPane();
dtrpnTypeTextHere.setContentType("type/normal");
dtrpnTypeTextHere.setToolTipText("");
dtrpnTypeTextHere.setFont(new Font("Arial", Font.PLAIN, 16));
dtrpnTypeTextHere.setForeground(Color.GREEN);
dtrpnTypeTextHere.setBackground(Color.BLACK);
dtrpnTypeTextHere.setBounds(10, 23, 1152, 671);
contentPane.add(dtrpnTypeTextHere);
int length = dtrpnTypeTextHere.getDocument().getLength();
String text = dtrpnTypeTextHere.getDocument().getText(0, length);
然后就像......
btnFinishEditing.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
BufferedWriter writer = null;
try {
//create a temporary file
File logFile = new File("yas.txt");
// This will output the full path where the file will be written to...
System.out.println(logFile.getCanonicalPath());
writer = new BufferedWriter(new FileWriter(logFile));
writer.write(text);
} catch (Exception e1) {
e1.printStackTrace();
} finally {
try {
// Close the writer regardless of what happens...
writer.close();
} catch (Exception e1) {
}
System.out.println("Quit because of user exit");
System.exit(0);
}
}
});
发生时，text的值不会改变，但JEditorPane的内容会有。您分配给text的值与JEditorPane的内容之间没有任何关系，除非您执行此操作的时刻。
所以，而不是这样做......
int length = dtrpnTypeTextHere.getDocument().getLength();
String text = dtrpnTypeTextHere.getDocument().getText(0, length);
在构造函数中，您应该在ActionListener ...
btnFinishEditing.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int length = dtrpnTypeTextHere.getDocument().getLength();
String text = dtrpnTypeTextHere.getDocument().getText(0, length);
BufferedWriter writer = null;
try {
//create a temporary file
File logFile = new File("yas.txt");
// This will output the full path where the file will be written to...
System.out.println(logFile.getCanonicalPath());
writer = new BufferedWriter(new FileWriter(logFile));
writer.write(text);
} catch (Exception e1) {
e1.printStackTrace();
} finally {
try {
// Close the writer regardless of what happens...
writer.close();
} catch (Exception e1) {
}
System.out.println("Quit because of user exit");
System.exit(0);
}
}
});
作为一个例子。
您可能还想查看The try-with-resources Statement，这会降低文件编写try-catch-finally阻止的复杂性;）
作为旁注，避免使用null布局，像素完美布局是现代ui设计中的错觉。影响组件个体大小的因素太多，您无法控制。 Swing旨在与布局管理器一起工作，放弃这些将导致问题和问题的终结，您将花费越来越多的时间来纠正
答案 1 :(得分：0)
您的方法程序在程序开始时运行一次以设置UI。您在程序运行时声明并设置变量文本。鉴于在初始化程序时没有输入任何文本，您将始终在文件中获得一个空字符串。
您需要做的是将变量文本和读取文本的代码从JEditorPane dtrpnTypeTextHere移动到操作的开头。