java - 如何将字符串更改为 ascii 值并返回字符串？

Question

我正在尝试制作一个简单的加密程序，将字符串转换为等效的 ASCII 值，然后再次将其解密为字符串或字符。

import java.io.*; 
import javax.swing.*;

public class SimpleEncryption {
   public static void main (String [] args) throws Exception
  {
     BufferedReader inKb = new BufferedReader (new InputStreamReader (System.in));

     for(int i=0; i<10; i++)
     {
        String ans = JOptionPane.showInputDialog ("Hello User, would you like to encrypt or decrypt?");
        ans = ans.toUpperCase();        
        int a = 0;

        if (ans.contains("EN")||ans.contains("ENCRYPT"))
        {
           String pass = "";
           pass = JOptionPane.showInputDialog ("Please type your phrase into input:");          

           for (int j=0; j<pass.length(); j++)
           {
              char c = pass.charAt(j);
              a = (int) c;
              System.out.print(a);
           }
           break;
        }


        if (ans.contains("DE")||ans.contains("DECRYPT"))
        {
           String pass = "";
           pass = JOptionPane.showInputDialog ("Please type the encrypted code into input:");          

           for (int k=0; k<pass.length(); k++)
           {
              char c = pass.charAt(k);
              a = (int)(c);
              i = (char) a;
              System.out.print(a);
           }
           break;
        }

        System.out.println("Sorry I don't understand, please retry.");
     }
  }
}

Answer 1

如果您想要的实际上是任何 java 字符串(基于 UTF-16)的 ASCII 编码(加密之前？)，您可以将其编码为 base64 :这个编码方案就是为此创建的。

这是 really easy在 java 中进行编码/解码(与其他语言一样)。