MD5加密

package com.woyo.reader.cms.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5 {
       /*
        *MD5
        */
public static String getMD5Str(String str) {
     MessageDigest messageDigest = null;
try {
      messageDigest = MessageDigest.getInstance("MD5");
      messageDigest.reset();
      messageDigest.update(str.getBytes("UTF-8"));
     } catch (NoSuchAlgorithmException e) {
       System.out.println("NoSuchAlgorithmException caught!");
	   System.exit(-1);
      } catch (UnsupportedEncodingException e) {
	   e.printStackTrace();
      }
      byte[] byteArray = messageDigest.digest();
     StringBuffer md5StrBuff = new StringBuffer();
for (int i = 0; i < byteArray.length; i++) {
    if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
      md5StrBuff.append("0").append(
	Integer.toHexString(0xFF & byteArray[i]));
	else
	md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
	}
        return md5StrBuff.toString();
	}
public static void main(String[] args) {	
          String md5String=new Md5().getMD5Str("我是MD5加密东东！");
	  System.out.print(md5String);
	}
}