MD5 加密处理

package com.tiancom.pas.util;

import java.security.MessageDigest;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class CopyOfMD5Digest {
	protected static Log log = LogFactory.getLog(CopyOfMD5Digest.class);
	  //
	private static MessageDigest __md5 = getInstance();

	//
	public static MessageDigest getInstance() {
		MessageDigest ret = null;
		try {
			ret = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
		}
		return ret;
	}

	//
	public static String digest(String s) {
		StringBuffer __digestBuffer = new StringBuffer();
		__digestBuffer.setLength(0);
		if(null != s){
			byte abyte0[] = __md5.digest(s.getBytes());
			for (int i = 0; i < abyte0.length; i++){
				__digestBuffer.append(toHex(abyte0[i]));
			}
			return __digestBuffer.toString();
		}else{
			return null;
		}
	}

	//
	public static String toHex(byte one) {
		String HEX = "0123456789ABCDEF";
		char[] result = new char[2];
		result[0] = HEX.charAt((one & 0xf0) >> 4);
		result[1] = HEX.charAt(one & 0x0f);
		String mm = new String(result);
		return mm;
	}

	//
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		System.out.println(digest("111111"));

	}

}