屏蔽从控制台输入的密码:Java [英] Masking password input from the console : Java

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问题描述

如何屏蔽控制台输入的密码?我使用的是 Java 6.

How to mask a password from console input? I'm using Java 6.

我尝试过使用 console.readPassword(),但它不起作用.一个完整的例子实际上可能对我有帮助.

I've tried using console.readPassword(), but it wouldn't work. A full example might help me actually.

这是我的代码:

import java.io.BufferedReader;
import java.io.Console;
import java.io.IOException;
import java.io.InputStreamReader;

public class Test 
{   
    public static void main(String[] args) 
    {   
        Console console = System.console();

        console.printf("Please enter your username: ");
        String username = console.readLine();
        console.printf(username + "
");

        console.printf("Please enter your password: ");
        char[] passwordChars = console.readPassword();
        String passwordString = new String(passwordChars);

        console.printf(passwordString + "
");
    }
}

我收到一个 NullPointerException...

I'm getting a NullPointerException...

推荐答案

完整示例 ?.运行此代码:(注意:此示例最好在控制台中运行,而不是在 IDE 中运行,因为在这种情况下 System.console() 方法可能返回 null.)

A full example ?. Run this code : (NB: This example is best run in the console and not from within an IDE, since the System.console() method might return null in that case.)

import java.io.Console;
public class Main {

    public void passwordExample() {        
        Console console = System.console();
        if (console == null) {
            System.out.println("Couldn't get Console instance");
            System.exit(0);
        }

        console.printf("Testing password%n");
        char[] passwordArray = console.readPassword("Enter your secret password: ");
        console.printf("Password entered was: %s%n", new String(passwordArray));

    }

    public static void main(String[] args) {
        new Main().passwordExample();
    }
}

这篇关于屏蔽从控制台输入的密码:Java的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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