无法将输入从 JTextField 存储到文件编写器

Question

我试图制作一个电话目录，用户必须使用JTextField输入多个输入。我也有一个搜索选项，将搜索输入的名称从目录在filewriter，我只是不能存储我的输入在filewriter。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"
+ "nnPlease 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;

我以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

您应该在写入BufferedWriter之后关闭它，像这样

out.close()

如果你不这样做，BufferedWriter将不会把你写进它的内容刷新到底层流。