简单加解密

简单加密解密算法
public class encrypt
{
/**
 * Title:        加密
 * Company:      Shanghai Anze Net
 * @@author:     liqiang
 */
public String AddPassword(String passinfo)
{
  //加密
String hs="";
     String stmp="";  
  if(passinfo!=null&&!passinfo.equals(""))
{ //判断字符串是否为空
   byte[] bytepass=passinfo.getBytes();//把中文转换成字节
   ////试验////
   for (int n=0;n<bytepass.length;n++)
{
    stmp=Integer.toString(bytepass[n]);
    hs=hs+stmp;
    if (n<bytepass.length-1)
   hs=hs+":";
   }
   System.out.println("加密前的号码："+hs);
   hs="";
   stmp="";
     ///////////////
   if(bytepass.length%2==0)
{//长度为偶数

      for (int n=0;n<bytepass.length/2;n++)
{
       stmp=stmp+Integer.toString(bytepass[n]);  
       stmp=stmp+":";//不是最后一个加'：'
          stmp=stmp+Integer.toString(bytepass[bytepass.length/2+n]);
      if (n!=bytepass.length/2-1)
{ //判断是否位最后一个
      stmp=stmp+":";
       }
      }
   }
else
{ //长度为奇数
      for (int n=0;n<bytepass.length/2;n++)
{
       stmp=stmp+Integer.toString(bytepass[n]);  
       stmp=stmp+":";//不是最后一个加'：'
          stmp=stmp+Integer.toString(bytepass[bytepass.length/2+n]);
       if (n!=bytepass.length/2-1)
{ //判断是否位最后一个
      stmp=stmp+":";
       }
else
{ //是最后一个
         stmp=stmp+":";
      stmp=stmp+Integer.toString(bytepass[bytepass.length-1]);
       }
      }    
   }
   hs=stmp;