移位加密算法的Java实现

package test1; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Test1 { //加密功能 public String encrepty(int[] source,int key) throws IOException{ int length=source.length; String s2=null; StringBuffer sbu = new StringBuffer(); for(int i=0;i<length;i++) { if(source[i]>96&&source[i]<123){ source[i]=(source[i]+key-97)%26+97; String s1=source[i]+","; sbu.append(s1); s2=sbu.toString(); } } //System.out.println(s2); return s2; } //解密功能 public String deciphring(int[] cipher,int key){ int length=cipher.length; String s4=null; StringBuffer sbu = new StringBuffer(); for(int i=0;i<length;i++){ if(cipher[i]>96&&cipher[i]<123) { cipher[i]=(cipher[i]-key-97)%26+97; String s3=cipher[i]+","; sbu.append(s3); s4=sbu.toString(); } } return s4; } //将字符串转成ASCII public int[] stringToAscii(String value) { int[] i1 = new int[50]; //System.out.println("开始转换成ascii"); StringBuffer sbu = new StringBuffer(); char[] chars = value.toCharArray(); for (int i = 0; i < chars.length; i++) { i1[i]=(int)chars[i]; } return i1; } //将ASCII转成字符串 public static String asciiToString(String value) { StringBuffer sbu = new StringBuffer(); String[] chars = value.split(","); for (int i = 0; i < chars.length; i++) { sbu.append((char) Integer.parseInt(chars[i])); } System.out.println("转换后为"+sbu.toString()); return sbu.toString(); } public static void main(String[] args) throws IOException { BufferedReader strin=new BufferedReader(new InputStreamReader(System.in)); System.out.print("请先输入key（0~26）并回车："); int key = Integer.valueOf(strin.readLine()); System.out.println("key=："+key); System.out.print("请选择对应的编号执行相应的功能并回车：1:加密功能；2：解密功能"); String function= strin.readLine(); Test1 t1=new Test1(); switch (function) { case "1": System.out.println("加密功能"); System.out.print("请先输入明文内容："); String mingwen = strin.readLine(); System.out.println("你输入的明文为："+mingwen); int[] mingwen2=t1.stringToAscii(mingwen); String m1=t1.encrepty(mingwen2,key); t1.asciiToString(m1); break; case "2": System.out.println("解密功能"); System.out.print("请先输入密文内容："); String miwen = strin.readLine(); System.out.println("你输入的密文为："+miwen); int[] miwen2=t1.stringToAscii(miwen); String mi1=t1.deciphring(miwen2, key); t1.asciiToString(mi1); break; default: break; } } }