Question

这是我的代码，如果记录与我的输入匹配，我的问题就是替换textfile中的字符串。只是尝试运行我的程序，我的操作系统是Ubuntu。

package atm_bankmanagement;
import java.util.Scanner;
import java.io.*;
public class ATM_BankManagement {

// create a main menu

public static void MainMenu()
{
System.out.println("[1] Admin");
System.out.println("[2] User");
System.out.println("[3] Exit");

Scanner a = new Scanner(System.in);
int mainChoice=a.nextInt();
switch(mainChoice)
{
case 1: AdminPanel();
break;
case 2: UserPanel();
break;
        case 3:
            break;
}
}
// END OF MainMenu method

// create a method for admin panel

public static void AdminPanel()
{
    System.out.print("Enter password: ");
    Scanner sc = new Scanner(System.in);
    int pass = sc.nextInt();
    if ((pass==132748))
    {
    System.out.println("---ADMIN PANEL---");
    System.out.println("[1] Add Bank Account");
    System.out.println("[2] Add Deposit");
    System.out.println("[3] Exit");

    Scanner b = new Scanner(System.in);
    int adminPanelChoice=b.nextInt();
    switch(adminPanelChoice)
    {
        case 1: APaddbankaccount();
            break;
        case 2: APadddeposit();
            break;
        case 3: MainMenu();
            break;
    }
    }
    else
    {
        System.out.println("Invalid password!");
        MainMenu();
    }

}
// END OF AdminPanel method

// create a method for admin panel add bank account

public static void APaddbankaccount()
{
    System.out.println("---ADMIN PANEL---");
    System.out.println("--Add Bank Account--");
    System.out.print("Enter Account Name: ");
    Scanner c = new Scanner(System.in);
    String accname = c.nextLine();
    System.out.print("Enter Account Number: ");
    Scanner d = new Scanner(System.in);
    int accnum = d.nextInt();
    System.out.print("Enter Amount: ");
    Scanner f = new Scanner(System.in);
    int amount=f.nextInt();


    try
    {
       File fi = new File("/home/kean/insert.txt") ;
       BufferedWriter w = new BufferedWriter(new FileWriter(fi,true));
       w.write(accnum+";"+accname+";"+amount);
       w.newLine();

       System.out.println("[1] Save Entry");
       System.out.println("[2] Exit");

       Scanner g = new Scanner(System.in);
       int addbankaccountChoice=g.nextInt();
       switch(addbankaccountChoice)
       {
           case 1: w.flush(); w.close();System.out.println("Saved...");MainMenu();
               break;
           case 2: MainMenu();
       }
    }
    catch(IOException e)
    {

    }

}
// END OF APaddbankaccount

//为管理员面板添加存款创建方法

public static void APadddeposit()
{
    System.out.println("---ADMIN PANEL---");
    System.out.println("--Add Deposit--");
    System.out.print("Enter account number:");
    Scanner h = new Scanner(System.in);
    String con = h.next();

    int pin = Integer.parseInt(con);

   try
   {

       BufferedReader br = new BufferedReader(new FileReader("/home/kean/insert.txt"));
       String mysplit="";


      String arr[] = new String[mysplit.split(";").length];
     String acname="";


      for(int i=0;i<arr.length;i++)
      {
           while((mysplit=br.readLine())!=null)
      {
          arr=mysplit.split(";"); 
          if((arr[i]).equals(con))
          {
              String accountName = arr[1];

              acname = accountName;
              System.out.println("Account Name: "+acname);

          }

      }
      }
      System.out.print("Enter Amount to be deposited: ");
      Scanner j = new Scanner(System.in);
      String depAmount=j.next();

      arr[2]=depAmount;
      System.out.print("Date: ");
      Scanner k = new Scanner(System.in);
      String dt = k.nextLine();

      File fil = new File("/home/kean/deposit.txt");
      BufferedWriter bw = new BufferedWriter(new FileWriter(fil,true));


      bw.write(con+";"+acname+";"+depAmount+";"+dt);
      bw.newLine();


      System.out.println("[1] Save Entry");
      System.out.println("[2] Cancel");
      Scanner l = new Scanner(System.in);
      int depChoice=l.nextInt();
      switch(depChoice)
      {
          case 1: bw.flush(); bw.close(); System.out.println("Saved...");MainMenu();
              break;
          case 2: MainMenu();
              break;
      }

   }
   catch(IOException e)
   {

   }

}
// END OF APadddeposit method

//<!--------C-O-D-E--H-A-R-D---------!>

//为用户帐户创建方法

public static void UserPanel()
{
    System.out.println("---USER PANEL---");

    System.out.print("Enter PIN: ");
    Scanner m = new Scanner(System.in);
    String myPin = m.next();



    try
    {
          BufferedReader br = new BufferedReader(new FileReader("/home/kean/insert.txt"));
       String mysplit="";

      String arr[] = new String[mysplit.split(";").length];
        String myname="";


         BufferedReader nbr = new BufferedReader(new FileReader("/home/kean/deposit.txt"));
       String nmysplit="";

       String myarr[] = new String[nmysplit.split(";").length];


      for(int i=0;i<myarr.length;i++)
      {
           while((mysplit=br.readLine())!=null && (nmysplit=nbr.readLine())!=null)
      {

          arr=mysplit.split(";"); 
          myarr=nmysplit.split(";");
          if((myarr[i]).equals(myPin) && (arr[i]).equals(myPin))
          {


              String accounName = arr[1];
              String money1 = arr[2];
              String money2= myarr[2];
              int mon = Integer.parseInt(money1);
              int monn = Integer.parseInt(money2);
              int totalmoney = mon+monn;

              myname = accounName;

               File myFi = new File("/home/kean/balance.txt");
              BufferedWriter wri = new BufferedWriter(new FileWriter(myFi,true));


              wri.newLine();
              wri.flush();

      System.out.println("Hi "+accounName+" what do you want to do?");
      System.out.println("[1] Balance Inquiry");
      System.out.println("[2] Withdraw");
      System.out.println("[3] Exit");
      Scanner n = new Scanner(System.in);
      int usersChoice=n.nextInt();
      switch(usersChoice)
      {
          case 1: 
              System.out.println("Your Current Balance is " +totalmoney);wri.close();

    MainMenu();
              break;
          case 2:  System.out.println("Your Current Balance is " +totalmoney);
                    System.out.println("Enter amount to be withdraw: ");
                    Scanner o = new Scanner(System.in);
              int wdrw = o.nextInt();
              if(wdrw>25000)
              {
                  System.out.println("Sorry you can't withdraw an amount higher than 25000");
                  UserPanel();
              }
          else
              {
                  File Note = new File("/home/kean/wihdraw.txt");
                  BufferedWriter wrt = new BufferedWriter(new FileWriter(Note));

                  wrt.write(myPin+";"+accounName+";"+wdrw);
                  wrt.newLine();
                  wrt.flush();
                  wrt.close();
                  int remain = totalmoney-wdrw;
                  System.out.println("Your remaining balance is "+remain);
                  MainMenu();
              }
            break;
      }

          }

      }
      }


    }
    catch(IOException e)
    {

    }
}

// END OF UserPanel's method

public static void main(String[] args) 
{
    MainMenu();
}

}

Answer 1

您可以轻松执行以下操作

Path path = Paths.get("home/kean/insert.txt");
Charset charset = StandardCharsets.UTF_8;

String content = new String(Files.readAllBytes(path), charset);
content = content.replaceAll("foo", "bar");
Files.write(path, content.getBytes(charset));

或Java 7或更新版

String content = IOUtils.toString(new FileInputStream(myfile), myencoding);
content = content.replaceAll(myPattern, myReplacement);
IOUtils.write(content, new FileOutputStream(myfile), myencoding);

但请注意，您需要添加错误处理，并且必须关闭流。

IOUtils：http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/IOUtils.html

如何使用java替换文本文件中的字符串？

1 个答案: