【加解密】简单字母表替换加解密

代码：

package com.hy.masking;

import java.util.HashMap;
import java.util.Map;

public class SimpleReplacer {
    private static final String fromStr="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    private static final String toStr  ="LMNOPQRSTUVWXYZABCDEFGHIJKtuvwxyzabcdefghijklmnopqrs6789012345";

    private static Map<Character,Character> enMap;
    private static Map<Character,Character> deMap;

    static{
        enMap =new HashMap<>();
        deMap =new HashMap<>();

        for(int i=0;i<fromStr.length();i++){
            char key=fromStr.charAt(i);
            char value=toStr.charAt(i);
            enMap.put(key,value);
            deMap.put(value,key);
        }
    }

    public static String encrypt(String str){
        char[] arr=str.toCharArray();

        for(int i=0;i<arr.length;i++){
            char key=arr[i];
            if(enMap.containsKey(key)){
                arr[i]=enMap.get(key);
            }
        }

        return String.valueOf(arr);
    }

    public static String decrypt(String str){
        char[] arr=str.toCharArray();

        for(int i=0;i<arr.length;i++){
            char key=arr[i];
            if(deMap.containsKey(key)){
                arr[i]=deMap.get(key);
            }
        }

        return String.valueOf(arr);
    }

    public static void main(String[] args){
        String[] arr={"abc012","er2EDF","WQYNS01823","csadsad321321","cczx2","321321"};

        for(String original:arr){
            String enStr=encrypt(original);
            String deStr=decrypt(enStr);

            String msg=String.format("原文=%s 密文=%s 译文=%s",original,enStr,deStr);
            System.out.println(msg);
        }
    }
}

输出：

原文=abc012 密文=LMN678 译文=abc012
原文=er2EDF 密文=PC8xwy 译文=er2EDF
原文=WQYNS01823 密文=pjrgl67489 译文=WQYNS01823
原文=csadsad321321 密文=NDLODLO987987 译文=csadsad321321
原文=cczx2 密文=NNKI8 译文=cczx2
原文=321321 密文=987987 译文=321321

END