package test;

import java.security.MessageDigest;

public class MD5Encrypt {

	public MD5Encrypt() {
	  }

	 private final static String[] hexDigits = {
	      "0", "1", "2", "3", "4", "5", "6", "7",
	      "8", "9", "a", "b", "c", "d", "e", "f"
	      };
	
	 public static String byteArrayToString(byte[] b) {
		    StringBuffer resultSb = new StringBuffer();
		    for (int i = 0; i < b.length; i++) {
		      resultSb.append(byteToNumString(b[i]));//使用本函数则返回加密结果的10进制数字字串，即全数字形式
		    }
		    return resultSb.toString();
		  }
		  private static String byteToNumString(byte b) {
		    int _b = b;
		    if (_b < 0) {
		      _b = 256 + _b;
		    }
		    return String.valueOf(_b);
		  }
		  private static String byteToHexString(byte b) {
		    int n = b;
		    if (n < 0) {
		      n = 256 + n;
		    }
		    int d1 = n / 16;
		    int d2 = n % 16;
		    return hexDigits[d1] + hexDigits[d2];
		  }
		  public static String MD5Encode(String origin) {
		    String resultString = null;
		    try {
		      resultString = new String(origin);
		      MessageDigest md = MessageDigest.getInstance("MD5");
		      resultString =
		byteArrayToString(md.digest(resultString.getBytes()));
		    }
		    catch (Exception ex) {
		    }
		    return resultString;
		  }
	 
	 
	public static void main(String[] args) {
		MD5Encrypt md5encrypt = new MD5Encrypt();
	    System.out.println(MD5Encode("admin"));
	}

}