MD5+ENUM DEMO

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package com.example.md5;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
/**
* 模拟md5数字加密入库，取出加密数字
* @author zcwfeng
* 2013-11-19
*/
public class Md5Demo {
   enum MYDEMO {
       ZERO(0), ONE(1), TWO(2), THREE(3), FOUR(4), FIVE(5), SIX(6), SEVEN(7), EIGHT(
               8), NINE(9);
       private int index;
       private String md5Idx;

       MYDEMO(int idx) {
           this.index = idx;
           this.md5Idx = Md5(String.valueOf(idx));
       }

       public int getIndex(int idx) {
           return index;
       }

       public int getValueIdx() {
           return index;
       }

   }

   public static void demo() {
       System.out.println(MYDEMO.ZERO.md5Idx);
       System.out.println(MYDEMO.ONE.md5Idx);
       System.out.println(MYDEMO.TWO.md5Idx);
       System.out.println(MYDEMO.THREE.md5Idx);
       System.out.println(MYDEMO.FOUR.md5Idx);
       System.out.println(MYDEMO.FIVE.md5Idx);
       System.out.println(MYDEMO.SIX.md5Idx);
       System.out.println(MYDEMO.SEVEN.md5Idx);
       System.out.println(MYDEMO.EIGHT.md5Idx);
       System.out.println(MYDEMO.NINE.md5Idx);
   }

   public static void main(String[] args) {
       // System.out.println(Md5("0"));
       // demo();
       System.out.println(getMyMd5Num(MYDEMO.TWO.md5Idx));
   }

   public static int getMyMd5Num(String md5Str) {
       HashMap map = new HashMap();
       map.put(MYDEMO.ZERO.md5Idx, 0);
       map.put(MYDEMO.ONE.md5Idx, 1);
       map.put(MYDEMO.TWO.md5Idx, 2);
       map.put(MYDEMO.THREE.md5Idx, 3);
       map.put(MYDEMO.FOUR.md5Idx, 4);
       map.put(MYDEMO.FIVE.md5Idx, 5);
       map.put(MYDEMO.SIX.md5Idx, 6);
       map.put(MYDEMO.SEVEN.md5Idx, 7);
       map.put(MYDEMO.EIGHT.md5Idx, 8);
       map.put(MYDEMO.NINE.md5Idx, 9);
       return (Integer) map.get(md5Str);
   }

   private static String Md5(String plainText) {
       try {
           MessageDigest md = MessageDigest.getInstance("MD5");
           md.update(plainText.getBytes());
           byte b[] = md.digest();

           int i;

           StringBuffer buf = new StringBuffer("");
           for (int offset = 0; offset < b.length; offset++) {
               i = b[offset];
               if (i < 0)
                   i += 256;
               if (i < 16)
                   buf.append("0");
               buf.append(Integer.toHexString(i));
           }

           // System.out.println("result: " + buf.toString());// 32位的加密
           //
           // System.out.println("result: " + buf.toString().substring(8,
           // 24));// 16位的加密
           return buf.toString();
       } catch (NoSuchAlgorithmException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       return null;
   }
}