我正在为一个班级分配作业，该作业要求我创建一个基本的身份验证系统，该系统检查文本文件中的用户凭据并显示取决于用户凭据和职位的文本文件。该代码应该至少使用两个不同的类，并且我有一个作为ValidateCredentials提供的类，但是我似乎无法使该类和方法调用正常工作。这是提供的代码：
package authentication;
import java.security.MessageDigest;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Scanner;
public class ValidateCredentials {
private boolean isValid;
private String filePath;
private String credentialsFileName;
public ValidateCredentials() {
filePath = "";
isValid = false;
credentialsFileName = "credentials";
}
public boolean isCredentialsValid(String userName, String passWord) throws Exception {
String original = passWord;
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(original.getBytes());
byte[] digest = md.digest();
StringBuffer sb = new StringBuffer();
for (byte b : digest) {
sb.append(String.format("%02x", b & 0xff));
}
System.out.println("");
System.out.println("original:" + original);
System.out.println("digested:" + sb.toString()); //sb.toString() is what you'll need to compare password strings
isValid = readDataFiles(userName, sb.toString());
return isValid;
}
public boolean readDataFiles(String userName, String passWord) throws IOException {
FileInputStream fileByteStream1 = null; // File input stream
FileInputStream fileByteStream2 = null; // File input stream
Scanner inFS1 = null; // Scanner object
Scanner inFS2 = null; // Scanner object
String textLine = null;
String textFileName = null;
boolean foundCredentials = false;
// Try to open file
System.out.println("");
System.out.println("Opening file " + credentialsFileName + ".txt");
fileByteStream1 = new FileInputStream(filePath + "credentials.txt");
inFS1 = new Scanner(fileByteStream1);
System.out.println("");
System.out.println("Reading lines of text.");
while (inFS1.hasNextLine()) {
textLine = inFS1.nextLine();
//System.out.println(textLine);
String[] words = textLine.split("\\s");//splits the string based on whitespace
if (words[0].equals(userName) && textLine.contains(passWord)) {
foundCredentials = true;
int last = words.length - 1;
textFileName = words[last];
break;
}
}
// Done with file, so try to close it
System.out.println("");
System.out.println("Closing file " + credentialsFileName + ".txt");
if (textLine != null) {
fileByteStream1.close(); // close() may throw IOException if fails
}
if (foundCredentials == true) {
// Try to open file
System.out.println("");
System.out.println("Opening file " + textFileName + ".txt");
fileByteStream2 = new FileInputStream(filePath + textFileName + ".txt");
inFS2 = new Scanner(fileByteStream2);
System.out.println("");
while (inFS2.hasNextLine()) {
textLine = inFS2.nextLine();
System.out.println(textLine);
}
// Done with file, so try to close it
System.out.println("");
System.out.println("Closing file " + textFileName + ".txt");
if (textLine != null) {
fileByteStream2.close(); // close() may throw IOException if fails
}
}
return foundCredentials;
}
}
下一批是我过去6个小时一直在研究和研究的代码：
package authentication;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.util.Scanner;
public class Authentication {
public static void main(String args[]) {
try {
Scanner inputCreds;
inputCreds = new Scanner(new File("src\\authentication\\credentials.txt"));
String userCredentials[][] = new String[100][4];
int count = 0;
while (inputCreds.hasNextLine()) {
userCredentials[count][0] = inputCreds.next();
userCredentials[count][1] = inputCreds.next();
String l[] = inputCreds.nextLine().split("\"[ ]+");
l[0] = l[0].trim();
l[0] = l[0].replace("\"", "");
userCredentials[count][2] = l[0];
userCredentials[count][3] = l[0].trim();
count++;
}
Scanner input = new Scanner(System.in);
boolean RUN = true;
int tries = 0;
while (RUN) {
System.out.println("Welcome to your Zoo Account Authorization Screen.");
System.out.println("Please select your option:");
System.out.println("(1) - Log In.");
System.out.println("(2) - Exit Program.");
int ch = Integer.parseInt(input.nextLine().trim());
if (ch == 1) {
tries++;
System.out.print("Username: ");
String userName = input.nextLine();
System.out.print("Password: ");
String passWord = input.nextLine();
MessageDigest md;
md = MessageDigest.getInstance("MD5");
md.update(passWord.getBytes());
byte[] digest = md.digest();
StringBuilder sb = new StringBuilder();
for (byte b : digest) {
sb.append(String.format("%02x", b & 0xff));
}
String hPassword = sb.toString();
boolean badCreds = true;
for (int i = 0; i < count; i++) {
if (userName.contentEquals(userCredentials[i][0])) {
if (hPassword.contentEquals(userCredentials[i][1])) {
List<String> data = null;
switch (userCredentials[i][3]) {
case "zookeeper":
data = Files.readAllLines(Paths.get("zookeeper.txt"), Charset.defaultCharset());
break;
case "admin":
data = Files.readAllLines(Paths.get("admin.txt"), Charset.defaultCharset());
break;
case "veterinarian":
data = Files.readAllLines(Paths.get("veterinarian.txt"), Charset.defaultCharset());
break;
default:
break;
}
if (data != null) {
for (String s : data) {
System.out.println(s);
}
}
tries = 0;
System.out.println("\n1) Logout.");
System.out.println("2) Exit.");
ch = Integer.parseInt(input.nextLine().trim());
if (ch == 2) {
RUN = false;
}
badCreds = false;
break;
}
}
}
if (badCreds) {
System.out.println("Invalid Username or password.");
}
} else {
break;
}
if (tries == 3) {
RUN = false;
System.out.println("Too many incorrect attempts!");
}
}
} catch (IOException | NumberFormatException | NoSuchAlgorithmException ex) {
}
}
}
我尝试在代码后使用方法调用(ClassName).(MethodName)();来通知用户太多错误尝试，但是老实说，由于似乎有代码，我对正确放置它的位置感到困惑帮助交换机也显示文本文件。