md5

package md5;

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

public class Snippet {
 /**
      * MD5 加密
      */ 
     private 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 str="nly";
      String strmd5=getMD5Str(str);
      System.out.println(strmd5);
  }
}