无法将 JTextField 的输入存储到文件编写器

Question

我正在尝试创建一个 phone 目录，用户必须在其中使用 JTextField 输入多个内容。我还有一个搜索选项，可以从 filewriter 的目录中搜索输入的名称，但我似乎无法将我的输入存储在 filewriter 中。这是我的初始代码

public static void main(String[] args) throws Exception {
    Scanner scan = new Scanner(System.in);
    int menu = 0;
    
    boolean quit = false;
    do{
    String input = JOptionPane.showInputDialog(null,"Telephone Directory Management System"
            + "\n1. Add a Student"
            + "\n2. Search"
            + "\n3. Sort Data"
            + "\n4. List of all data"
            + "\n5. Exit"
            + "\n\nPlease enter your choice:","Main Menu",JOptionPane.QUESTION_MESSAGE);

    menu = Integer.parseInt(input);
        
        switch (menu) {
            case 1:
                JTextField student = new JTextField();
                JTextField name = new JTextField();
                JTextField address = new JTextField();
                JTextField phone = new JTextField();
                
                Object[] fields = {
                    "Enter Student ID:",student,
                    "Enter Name:",name,
                    "Enter Address:",address,
                    "Enter Phone No.:",phone};
                int add = JOptionPane.showConfirmDialog(null,fields,"Add a Student",JOptionPane.OK_CANCEL_OPTION);

                if (add == JOptionPane.OK_OPTION)
                {

                    String student1 = student.getText();
                    String name1 = name.getText();
                    String address1 = address.getText();
                    String phone1 = phone.getText();
                    
                    FileWriter fw = new FileWriter(new File("directory.txt"), true);
                    BufferedWriter out = new BufferedWriter(fw);
                    out.write(student1 + " " + name1 + " " + address1 + " " + phone1);
                    out.newLine();
                }
                break;
            case 2:
                input = JOptionPane.showInputDialog(null,"Enter name to search information:","Search",JOptionPane.OK_CANCEL_OPTION);
                File f = new File("directory.txt");
                try {
                    BufferedReader freader = new BufferedReader(new FileReader(f));
                    String s;
                    while ((s = freader.readLine()) != null) {
                        String[] st = s.split(" ");
                        String id = st[0];
                        String nm = st[1];
                        String add1 = st[2];
                        String phoneNo = st[3];
                        if (input.equals(nm)) {
                            JOptionPane.showMessageDialog(null,"Student ID: "+id+"\nName: "+nm+"\nAddress: "+add1+"\nPhone No.: "+phoneNo+"","Information",JOptionPane.QUESTION_MESSAGE);
                        }
                    }
                    freader.close();
                } catch (Exception e) {
                }

                break;

我之前尝试过使用扫描仪，它确实存储了我的输入，但我需要在这个中使用 JOptionPane。非常感谢任何可以帮助我的人。

Answer 1

写入BufferedWriter后应该关闭，像这样

out.close()

如果您不这样做，BufferedWriter 将不会将您写入其中的内容刷新到基础流中。

无法将 JTextField 的输入存储到文件编写器

Can't store inputs from JTextField to filewriter

java

swing

jtextfield

joptionpane

switch-statement