MD5

package com.iask.base.md5;

import java.security.MessageDigest;

/**
* md5加密
*
* @author 李正
*
*/
public class MD5 {
   public final static String encode(String str) {
       return encodeMd5(str);
   }

   private final static String encodeMd5(String s) {
       char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
               'A', 'B', 'C', 'D', 'E', 'F' };
       try {
           byte[] btInput = s.getBytes();
           MessageDigest mdInst = MessageDigest.getInstance("MD5");
           mdInst.update(btInput);
           byte[] md = mdInst.digest();
           int j = md.length;
           char str[] = new char[j * 2];
           int k = 0;
           for (int i = 0; i < j; i++) {
               byte byte0 = md[i];
               str[k++] = hexDigits[byte0 >>> 4 & 0xf];
               str[k++] = hexDigits[byte0 & 0xf];
           }
           return new String(str);
       } catch (Exception e) {
           e.printStackTrace();
           return null;
       }
   }

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