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

问题描述

有没有人知道一种方法来从控制台输入屏蔽密码？我使用Java 6。

Does anyone know of a way to mask a password from console input? I'm using Java 6.

我试过使用console.readPassword（），但它不会工作...一个完整的例子可能会帮助我。

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 + "\n");

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

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

我得到一个NullPointerException ....

I'm getting a NullPointerException....

提前感谢！ ：）

推荐答案

完整的例子？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System.console（）方法可能在这种情况下返回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();
}
}

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