使用java编程实现明文和密文之间的互转

    char c[] = "大家好".toCharArray();
    for(int i = 0;i<c.length;i++) {
        c[i] = (char)(c[i] ^ 'Q');//将明文转换成密文
    }
    String string = new String(c, 0, c.length);
    System.out.println("密文：" + string);
    for(int i=0;i<c.length;i++) {
        c[i] = (char)(c[i] ^ 'Q');//将密文还原为明文
    }
    String string1 = new String(c, 0, c.length);
    System.out.println("明文：" + "\n" + string1);

import java.nio.charset.Charset;
 
 
public class DeEnCode {
 
    private static final String key0 = "FECOI()*&<MNCXZPKL";
    private static final Charset charset = Charset.forName("UTF-8");
    private static byte[] keyBytes = key0.getBytes(charset);
    
    public static String encode(String enc){
        byte[] b = enc.getBytes(charset);
        for(int i=0,size=b.length;i<size;i++){
            for(byte keyBytes0:keyBytes){
                b[i] = (byte) (b[i]^keyBytes0);
            }
        }
        return new String(b);
    }
    
    public static String decode(String dec){
        byte[] e = dec.getBytes(charset);
        byte[] dee = e;
        for(int i=0,size=e.length;i<size;i++){
            for(byte keyBytes0:keyBytes){
                e[i] = (byte) (dee[i]^keyBytes0);
            }
        }
        return new String(e);
    }
 
    public static void main(String[] args) {
        String s="you are right";
        String enc = encode(s);
        String dec = decode(enc);
        System.out.println(enc);
        System.out.println(dec);
    }
}