如何在Java中生成安全的隨機密碼？

import java.security.SecureRandom;
<p>public class PasswordGenerator {
private static final String CHAR_LOWERCASE = "abcdefghijklmnopqrstuvwxyz";
private static final String CHAR_UPPERCASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final String DIGITS = "0123456789";
private static final String SPECIAL <em>CHARS = "!@#$%^&*()-</em> = []{}|;:,.?";</p> <pre class='brush:php;toolbar:false;'>private static final String PASSWORD_CHARS =
    CHAR_LOWERCASE CHAR_UPPERCASE DIGITS SPECIAL_CHARS;
private static final int PASSWORD_LENGTH = 12;

private static final SecureRandom random = new SecureRandom();

public static String generatePassword() {
    StringBuilder password = new StringBuilder(PASSWORD_LENGTH);
    for (int i = 0; i < PASSWORD_LENGTH; i ) {
        int index = random.nextInt(PASSWORD_CHARS.length());
        password.append(PASSWORD_CHARS.charAt(index));
    }
    return password.toString();
}

public static void main(String[] args) {
    System.out.println("Generated Password: " generatePassword());
}

}

public static String generateStrongPassword() {
    StringBuilder password = new StringBuilder();
    password.append(randomChar(CHAR_LOWERCASE));
    password.append(randomChar(CHAR_UPPERCASE));
    password.append(randomChar(DIGITS));
    password.append(randomChar(SPECIAL_CHARS));
<pre class='brush:php;toolbar:false;'>// Fill the rest
for (int i = 4; i < PASSWORD_LENGTH; i ) {
    password.append(randomChar(PASSWORD_CHARS));
}

// Shuffle to avoid predictable patterns
return shuffleString(password.toString());

}

private static char randomChar(String chars) { return chars.charAt(random.nextInt(chars.length())); }

private static String shuffleString(String input) { char[] chars = input.toCharArray(); for (int i = chars.length - 1; i > 0; i--) { int j = random.nextInt(i 1); char temp = chars[i]; chars[i] = chars[j]; chars[j] = temp; } return new String(chars); }