Question

我正在尝试创建一个用户注册的程序，并使用简单的文本输出将其信息输出到文件中？

这是我的全班..

package malkawi.login;


import java.awt.BorderLayout;
import java.awt.ComponentOrientation;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.*;

import javax.swing.*;

import malkawi.login.JTextFieldLimit;


/**
 * 
 * @author Defiledx1
 * sign up
 */

public class SignUp extends JFrame implements EventListener {



    JFrame frame = new JFrame();
    JPanel panel = new JPanel();
    JButton complete = new JButton("Next");
    JLabel fname = new JLabel("Name: ");
    JLabel Mname = new JLabel("Middle Name: ");
    JLabel Lname = new JLabel("Last Name: ");
    JLabel user = new JLabel("Username: ");
    JLabel pass = new JLabel("Password: ");
    JLabel info = new JLabel("Click Next to Continue");
    JLabel email = new JLabel("Email: ");
    JLabel scode = new JLabel("Secret Code: ");
    JTextField fname1 = new JTextField();
    JTextField Mname1 = new JTextField();
    JTextField Lname1 = new JTextField();
    JTextField user1 = new JTextField();
    JPasswordField pass1 = new JPasswordField();
    JTextField email1 = new JTextField();
    JTextField scode1 = new JTextField();
    JRadioButton showPass = new JRadioButton("Show Pass");


    public SignUp() {
        super("Sign Up - Flare By Malkawi");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(600, 400);
        setResizable(false);
        setVisible(true);
        setVisible(true);
        setLayout(new GridLayout(0, 2, 10, 10));
        setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
        /*
         * Limitations
         */
        fname1.setDocument(new JTextFieldLimit(10));
        Mname1.setDocument(new JTextFieldLimit(1));
        Lname1.setDocument(new JTextFieldLimit(10));
        user1.setDocument(new JTextFieldLimit(15));
        email1.setDocument(new JTextFieldLimit(80));
        scode1.setDocument(new JTextFieldLimit(5));
        /*
         * End Of Limitations
         */
        /*
         * RadioButton Checked : Unchecked
         */
        showPass.addItemListener(new ItemListener() {
             public void itemStateChanged(ItemEvent e) {          
                 showPassword(e.getStateChange() == 1 ? true : false);

             }           
          });
        /*
         * End of RadioButton Checked : UnChecked
         */
        /*
         * Action of registration
         */
          complete.addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e)
                {
                 try {
                    outPutInformation();
                } catch (FileNotFoundException | UnsupportedEncodingException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                    System.out.println("Flare is unable at the moment!");
                }
                }
            }); 
          /*
           * End of Action of registration
           */
          //  Dimension labelSize = info.getPreferredSize();
          /*
           * Start of placements
           */
            //add(info);
            add(fname);
            add(fname1);
            add(Mname);
            add(Mname1);
            add(Lname);
            add(Lname1);
            add(user);
            add(user1);
            add(pass);
            add(pass1);
            add(email);
            add(email1);
            add(scode);
            add(scode1);
            add(complete);
            add(showPass);
            add(info);
            pack();
    }

    public void showPassword(boolean showP) {
        if (showP == true) {
            pass1.setEchoChar((char)0);
        } else {
            pass1.setEchoChar('*');
        }

    }

    /*
     * File Output Requirements
     */
    String filename = user1.getText();
    String firstname = fname1.getText();
    String middlename = Mname1.getText();
    String lastname = Lname1.getText();
    String username = user1.getText();
    @SuppressWarnings("deprecation")
    String password = pass1.getText();
    String hotmail = email1.getText();
    String secretcode = scode1.getText();
    /*
     * File Output done
     */


    public void outPutInformation() throws FileNotFoundException, UnsupportedEncodingException {
        PrintWriter writer = new PrintWriter(filename+".txt", "UTF-8");
        writer.println(firstname);
        writer.println(middlename);
        writer.println(lastname);
        writer.println(username);
        writer.println(password);
        writer.println(hotmail);
        writer.println(secretcode);
        writer.close();
    }



}

问题是它没有输出任何东西。如何输出像

后面的2文件夹这样的文件

谢谢！

Answer 1

这不输出任何内容，因为在输入文本字段中的任何内容之前已初始化变量。您需要这样做，或者直接将文本字段值写入文件，而不是先保存到变量然后写入文件：

public void outPutInformation() throws FileNotFoundException, UnsupportedEncodingException {

    String filename = user1.getText();
    String firstname = fname1.getText();
    String middlename = Mname1.getText();
    String lastname = Lname1.getText();
    String username = user1.getText();
    @SuppressWarnings("deprecation")
    String password = pass1.getText();
    String hotmail = email1.getText();
    String secretcode = scode1.getText();

    PrintWriter writer = new PrintWriter(filename+".txt", "UTF-8");
    writer.println(firstname);
    writer.println(middlename);
    writer.println(lastname);
    writer.println(username);
    writer.println(password);
    writer.println(hotmail);
    writer.println(secretcode);
    writer.close();
}

JTextField到文件输出

1 个答案: