用两种不同的方法验证密码

我试图找出如何让程序检查在菜单选择7中输入的密码，以解密一个文件，以匹配在菜单选择6中输入的相同密码。我试过了 if 在decrypt选项下的语句，以检查密码是否有效但无法正常工作。

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

public class FileManager

{

//store the absolute path of the working dirctory

private String currentWorkingDirectory;

//stores the directory of the active working directory

private File currentWorkingFile;

//used to exit the program, when set to true.

private boolean exit;

// This is a no argument constructor

public FileManager()

{

currentWorkingDirectory = "";

exit = false;

}//FileManager Ends

// This function displays the menu of the program

public void menuSelection()

{

System.out.println("\t\tMAIN MENU");

System.out.println("\t0) Eixt");

System.out.println("\t1) Select Directory");

System.out.println("\t2) List Directory Content (First level)");

System.out.println("\t3) List Directory Content (all level)");

System.out.println("\t4) Delete File");

System.out.println("\t5) Display Files(Hexadecima View");

System.out.println("\t6) Encrypt Files(XOR with password)");

System.out.println("\t7) Decrypt Files(XOR with password)\n\n\n");

}//menuSelection() Ends

//This function is used to exit the program

public void exit()

{

this.exit = true;

}//exit() Ends

//This function provide a means for the user to select an active working directory

private void selectDirectory()

{

//ask user to enter the path of the directory

System.out.print("Enter the absolute path of the directory:\n");

//user Scanner to recieve user's input

Scanner scan = new Scanner(System.in);

this.currentWorkingDirectory = scan.next();

//create a new currentWorkingFile object

currentWorkingFile = new File(currentWorkingDirectory);

//check if currentWorkingFile is not a directory and does not exist

//ask the user to enter the currentWorkingFile again

while(!(currentWorkingFile.exists() && currentWorkingFile.isDirectory())){

System.out.print("\n\""+currentWorkingDirectory+ "\"Does not exist:\n");

System.out.print("Enter the absolute path of the directory:\n");

//user Scanner to receive user's input

scan = new Scanner(System.in);

this.currentWorkingDirectory = scan.next();

//create a new currentWorkingFile object

currentWorkingFile = new File(currentWorkingDirectory);

}//while Ends

System.out.println("Your Current Working Directory is: \'"+ currentWorkingDirectory+"\'");

//scan.close();

}//selectDirectory() Ends

// This function list a files level 1 content.

private String[] listFirstLevelFiles()

{

String[] fileList;

int fileIndex = 0;

File nextLevelFile;

//display all the folders and currentWorkingFile in the first level

fileList = currentWorkingFile.list();

System.out.println("List of files in "+ currentWorkingDirectory + "\n");

//use the while loop to list all the immediate

//files and directories

while(fileIndex < fileList.length){

nextLevelFile = new File (currentWorkingFile+"/"+fileList[fileIndex]);

if(nextLevelFile.isDirectory()){

System.out.println((fileIndex+1)+") "+fileList[fileIndex]+" | Dir ");

}//if ends

else{

System.out.println((fileIndex+1)+") "+fileList[fileIndex]);

}

fileIndex++;

}//while Ends

return fileList;

}//listDirectory(boolean) Ends

//This function list a files content, recursively

private void listFilesRecursively(File file)

{

String[] fileList;

int fileIndex = 0;

File nextLevelFile;

//display all the folders and currentWorkingFile in the first level

fileList = file.list();

//use the while loop to list all the immediate

//files and directories

while(fileIndex < fileList.length){

//create a currentWorkingFile object out of each currentWorkingFile in the directory

nextLevelFile = new File(file.getAbsoluteFile().toString()+"/"+fileList[fileIndex]);

//print out this formate if currentWorkingFile is a directory

if(nextLevelFile.isDirectory()){

System.out.println((fileIndex+1)+") "+fileList[fileIndex]+" | Dir |Parent "+ nextLevelFile.getParentFile());

}//if ends

else{

System.out.println((fileIndex+1)+") "+fileList[fileIndex]+" | Dir |Parent "+     nextLevelFile.getParentFile());

}

//check whether the newly created currentWorkingFile object is a Directory

if(nextLevelFile.isDirectory()){

//recursively list the content of the directory

listFilesRecursively(nextLevelFile);

}//if ends

fileIndex++;

}//while Ends

System.out.println("");

}//listDirectory(boolean) Ends

//This function deletes files specified by the user

private void deleteFile()

{

//ask user to enter the input

System.out.print("\nEnter the name of the file you want to delete: ");

//recieve the files index from the user, specifying the currentWorkingFile to be deleted

String fileName = new Scanner(System.in).next();

//delete the currentWorkingFile

File fileToDelete = new File(currentWorkingFile.getAbsoluteFile()+"/"+fileName);

//ask again for correct file name

if(!fileToDelete.exists()){

System.out.println("***[ERROR: The file you entered does not exist]***");

return;

}//while Ends

//delete the currentWorkingFile

fileToDelete.delete();

System.out.println("You have successfully deleted the following file: \'"+fileName);

}//deleteFile() Ends

private void displayFileInHexFormat() throws IOException

{

//ask user to enter the input

System.out.print("\nEnter the name of the file you want to display: ");

//recieve the files index from the user, specifying the currentWorkingFile to be deleted

String fileName = new Scanner(System.in).next();

//check to make sure that user's input is valid

BufferedReader bf = null;

//create a currentWorkingFile Object from the choosen currentWorkingFile

File fileToDisplay = new File(currentWorkingFile.getAbsoluteFile()+"/"+fileName);

//ask again for correct file name

if(!fileToDisplay.exists()){

System.out.println("***[ERROR: The file you entered does not exist]***");

}//while Ends

if(currentWorkingFile.isDirectory()){

System.out.println("The file you selected is a Directory \n");

}

try

{

//display the content of the currentWorkingFile

System.out.println("Hexadecimal display of: \'"+fileName+"\'\n");

//EncrypFie the content of the currentWorkingFile

bf = new BufferedReader(new FileReader(fileToDisplay));

int count= 0;

int charCode;

while(bf.ready())

{

charCode = bf.read();

System.out.print(" "+String.format("%x", charCode));

if(count==30){

System.out.print("\n");

count=0;

}//if Ends

count++;

}//while Ends

bf.close();

} catch (FileNotFoundException ex) {

Logger.getLogger(FileManager.class.getName()).log(Level.SEVERE, null, ex);

} catch (IOException ex) {

Logger.getLogger(FileManager.class.getName()).log(Level.SEVERE, null, ex);

}finally{

bf.close();

}//Try-catch-finally block Ends

}//displayFileInHexFormat() Ends

//This function encrypts files using the XOR scheme

private void encryptFile() throws InputMismatchException, IOException{

String nameOfFile = "";

//ask user to enter the input

System.out.print("\nEnter the name of the file you want to Encrypt: ");

//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt

String fileName = new Scanner(System.in).next();

//create a currentWorkingFile Object from the choosen currentWorkingFile

File fileToEncrypt = new File(this.currentWorkingDirectory+"/"+fileName);

//ask again for correct file name

if(!fileToEncrypt.exists()){

System.out.println("***[ERROR: The file you entered does not exist]***");

}//while Ends

//ask user to enter the input

System.out.print("\nEnter Password: ");

//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt

String password = new Scanner(System.in).next();

//use buffered read and writer to read and write to files

BufferedReader bf = null;

BufferedWriter bw = null;

//create a file to store the encryption content

File encryptedFile = new File(this.currentWorkingDirectory+"/"+fileName+"_encrypted.txt");

if(fileToEncrypt.isDirectory())

{

System.out.println("The file you selected is a Directory");

return;

}

try {

//EncrypFie the content of the currentWorkingFile

bf = new BufferedReader(new FileReader(fileToEncrypt));

bw = new BufferedWriter(new FileWriter(encryptedFile));

int passwordIndex = 0;

char charCode;

char encryptChar;

// while loop reads and encrypts all characters of the specified file and the saves the encrypted contented into a new file, and delete the original one

while(bf.ready()){

if(passwordIndex==password.length()){

passwordIndex = 0;

}//if Ends

charCode = (char)bf.read();

encryptChar = (char) (password.charAt(passwordIndex) ^ (char)charCode);

bw.append(encryptChar);

passwordIndex++;

}

bf.close();

} catch (FileNotFoundException ex) {

Logger.getLogger(FileManager.class.getName()).log(Level.SEVERE, null, ex);

} catch (IOException ex) {

Logger.getLogger(FileManager.class.getName()).log(Level.SEVERE, null, ex);

}finally{

bw.flush();

bf.close();

bw.close();

fileToEncrypt.delete();

}//Try-catch-finally-ends

}//encriptFile() ends

//This function is used to decrypt files which have been encrypted by this program

private void decrypteFile() throws IOException{

String pathOfFile;

BufferedReader bf = null;

BufferedWriter bw = null;

//ask user to enter the input

System.out.print("\nEnter the name of the file you want to decrypt: ");

//receive the files index from the user, specifying the currentWorkingFile to be Encrypt

String fileName = new Scanner(System.in).next();

//store the asolute path of the file

pathOfFile = this.currentWorkingDirectory+"/"+fileName;

//create a currentWorkingFile Object from the choosen currentWorkingFile

File fileTDeEncrypt = new File(pathOfFile);

//print error message if file does not exist

if(!fileTDeEncrypt.exists()){

System.out.println("***[ERROR: The file you entered does not exist]***");

return;

}//while Ends

//ask user to enter the input

System.out.print("\nEnter Password: ");

//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt

String password = new Scanner(System.in).next();

//remove the "_encrypted.txt" from the filename

pathOfFile = pathOfFile.replaceAll("(_encrypted.txt)", "");

//create file were the decryted content will be stored.

File encryptedFile = new File(pathOfFile);

try {

//EncrypFie the content of the currentWorkingFile

bf = new BufferedReader(new FileReader(fileTDeEncrypt));

bw = new BufferedWriter(new FileWriter(encryptedFile));

int passwordIndex = 0;

char charCode;

char encryptChar;

// while loop reads and encrypts all characters of the specified file and the saves the encrypted contented into a new file, and delete the original one

while(bf.ready()){

if(passwordIndex==password.length()){

passwordIndex = 0;

}//if Ends

charCode = (char)bf.read();

encryptChar = (char) (password.charAt(passwordIndex) ^ (char)charCode);

bw.append(encryptChar);

passwordIndex++;

}

bf.close();

} catch (FileNotFoundException ex) {

Logger.getLogger(FileManager.class.getName()).log(Level.SEVERE, null, ex);

} catch (IOException ex) {

Logger.getLogger(FileManager.class.getName()).log(Level.SEVERE, null, ex);

}finally{

bw.flush();

bf.close();

bw.close();

fileTDeEncrypt.delete();

}//Try-catch-finally-ends

}//decrypteFile Ends

// This function calls each of the above functions and executes the base on the user's menu   selection

public void runFileManager() throws IOException{

//clear console

clearConsole();

while(exit==false){

//display the menu

menuSelection();

//ask user to make a menu selection

System.out.print("Make a selection from the menu: ");

//store user's input

String menuSelection = new Scanner(System.in).next();

//make sure that user can not use program if current working directory has not been selected

if(this.currentWorkingFile != null || menuSelection.equals("1") || menuSelection.equals("0"))  {

//use the Switch-case conditional to perform the action selected

switch(menuSelection){

case "0":

this.exit();

break;

case "1":

this.selectDirectory();

break;

case "2":

try{

this.listFirstLevelFiles();

}catch(NullPointerException ex){

}

break;

case "3":

try{

this.listFilesRecursively(currentWorkingFile);

}catch(NullPointerException ex){

}

break;

case "4":

try{

this.deleteFile();

}catch (InputMismatchException | ArrayIndexOutOfBoundsException ex ) {

System.out.println("ERROR: You Entered an Invalid Index. Try again");

this.deleteFile();

}//try-catch ends

break;

case "5":

try {

this.displayFileInHexFormat();

}catch (InputMismatchException | FileNotFoundException| ArrayIndexOutOfBoundsException ex ) {

System.out.println("ERROR: You Entered an Invalid Index. Try again");

this.displayFileInHexFormat();

}//try-catch ends

break;

case "6":

try {

this.encryptFile();

}catch (InputMismatchException| FileNotFoundException| ArrayIndexOutOfBoundsException ex ) {

System.out.println("ERROR: You Entered an Invalid Index. Try again");

this.encryptFile();

}//try-catch ends

break;

case "7":

try {

this.decrypteFile();

}catch (InputMismatchException | FileNotFoundException| ArrayIndexOutOfBoundsException ex ) {

System.out.println("ERROR: You Entered an Invalid Index. Try again");

this.decrypteFile();

}//try-catch ends

break;

default:

System.out.println("***[Error: You made an invalid menu selection]***");

break;

}//Switch-case Ends

if(!menuSelection.equalsIgnoreCase("0")){

System.out.print("\n\nPress 'Enter' to countinue");

new Scanner(System.in).nextLine();

//clear screen

clearConsole();

}

}//if Ends

else System.out.println("You must choose a current working directory ");

}//while() Ends

System.out.println("Thank You for stopping by. Bye bye");

}//runFileManager() Ends

private void clearConsole(){

String os = System.getProperty("os.name");

try{

if (os.contains("Windows")){

Runtime.getRuntime().exec("cls");

}

else{

Runtime.getRuntime().exec("clear");

}

}catch(IOException ex){

for (int i =0 ; i< 100; i++){

System.out.println("");

}

}

}//clearConsole() Ends

// THIS IS THE MAIN METHOD @param args the command line arguments

public static void main(String[] args) throws IOException {

// TODO code application logic here

//create a FileManager object

FileManager fm = new FileManager();

//clear the console

fm. clearConsole();

//run the application

fm.runFileManager();

}//main Ends

}//File Manager Ends

我正在查看的代码部分。

private void encryptFile() throws InputMismatchException, IOException{
String nameOfFile = "";
//ask user to enter the input
System.out.print("\nEnter the name of the file you want to Encrypt: ");
//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt
String fileName = new Scanner(System.in).next();
//create a currentWorkingFile Object from the choosen currentWorkingFile
File fileToEncrypt = new         File(this.currentWorkingDirectory+"/"+fileName);
//ask again for correct file name
if(!fileToEncrypt.exists()){
System.out.println("***[ERROR: The file you entered does not exist]***");
}//while Ends
//ask user to enter the input
System.out.print("\nEnter Password: ");
//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt
String password = new Scanner(System.in).next();

包括解密方法的一部分

private void decrypteFile() throws IOException{
String pathOfFile;
BufferedReader bf = null;
BufferedWriter bw = null;
//ask user to enter the input
System.out.print("\nEnter the name of the file you want to decrypt: ");
//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt
String fileName = new Scanner(System.in).next();
//store the asolute path of the file
pathOfFile = this.currentWorkingDirectory+"/"+fileName;
//create a currentWorkingFile Object from the choosen currentWorkingFile
File fileTDeEncrypt = new File(pathOfFile);
//print error message if file does not exist
if(!fileTDeEncrypt.exists()){
System.out.println("***[ERROR: The file you entered does not exist]***");
return;
}//while Ends
//ask user to enter the input
System.out.print("\nEnter Password: ");
//recieve the files index from the user, specifying the currentWorkingFile to be Encrypt
String password = new Scanner(System.in).next();

包括加密方法的一部分

用两种不同的方法验证密码

暂无答案！

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