MD5Util

package com.jf.utils;  
  
import java.security.MessageDigest;  
  
/** 
 * MD5加密工具类 
 */  
public abstract class MD5Utils {
    
    // 16进制的字符数组 
  private final static String[] strDigits ={"0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"};

  private static String byteToArrayString(byte bByte){
      int iRet=bByte;
      if(iRet<0)
      iRet+=256;
      int iD1=iRet/16;
      int iD2=iRet%16;
      return strDigits[iD1]+strDigits[iD2];
  }
 
    //转换字符数组为16进制字符串
    private static String byteToString(byte[] bByte){
        StringBuffer sBuffer=new StringBuffer();
        for (int i = 0; i < bByte.length; i++) 
            sBuffer.append(byteToArrayString(bByte[i]));
        return sBuffer.toString();
    }
    
    public static String getMD5code(String strObj){
        String resultString =null;
        try {
            resultString=new String(strObj);
            //信息摘要是安全的单向哈希函数，它接收任意大小的数据，并输出固定长度的哈希值。  
            MessageDigest md= MessageDigest.getInstance("MD5");
            //使用平台的默认字符集将此 String 编码为 byte序列，并将结果存储到一个新的 byte数组中  
            resultString=byteToString(md.digest(strObj.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return resultString;
    }
    public static void main(String[] args) {
        System.out.println(getMD5code("123456"));
    }
    
}