MD5加密

package com.estone.manage.districtTest.action;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5 {
    
    private final static String[] strs ={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
    
    public Md5(){
        
    }
    
    //返回形式为数字和字符串
    public static String byteToArrayString(byte bByte){
        int iInt = bByte;
        System.out.println("iInt----------------"+iInt);
        if(iInt<0){
            iInt+=256;
        }
        int d1 = iInt/16;
        int d2 = iInt%16;
        return strs[d1]+strs[d2];
    }
    
    //返回形式只为数字
    public static String byteToNum(byte bByte){
        int iInt0 = bByte;
        System.out.println("iInt0----------------"+iInt0);
        if(iInt0<0){
            iInt0+=256;
        }
        
        return String.valueOf(iInt0);
    }
    
    //转换字节数组为十六进制字符串
    public static String byteToString(byte[] bByte){
        StringBuffer sBuffer = new StringBuffer();
        for(int i=0;i<bByte.length;i++){
            sBuffer.append(byteToArrayString(bByte[i]));
            System.out.println("byteToArrayString(bByte[i])----------------"+byteToArrayString(bByte[i]));
        }
        
        return sBuffer.toString();
    }
    
    public static String getMd5Code(String str){
        String resultString = null;
        try {
            resultString = new String(str);
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteToString(md.digest(str.getBytes()));
            
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return resultString;
    }
    public static void main(String [] args){
        System.out.println(Md5.getMd5Code("yang"));
    }
}