MD5加密

package utils;

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

public class MD5Util {
 
 public static void main(String[] args) {

 }

 /**
     * MD5 加密
     */
    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();
    }
}