ND 5暗号化

/**
 * java.security   MessageDigest             ，       ，   update( )    
	            ，     digest( )          。
 */
package org.cric.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
 * MD5  
 * @author Administrator
 *
 */

public class DigestPass {
	private MessageDigest messageDigest;
	private String result = "";
	private byte[] args = null;
	public String getDigestPassWord(String userpass) {
		try {
			//   MessageDigest  ,         (MD5)
			messageDigest = MessageDigest.getInstance("MD5");
			//    getBytes( )         
			messageDigest.update(userpass.getBytes("GBK"));
			//   MessageDigest   digest( )      ，                
			args = messageDigest.digest();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			throw new RuntimeException();
		} catch (UnsupportedEncodingException ee) {
			ee.printStackTrace();
			throw new RuntimeException();
		} finally {
			messageDigest.reset();
		}

		//          
		result = "";// result  ，        ！！！
		for (int i = 0; i < args.length; i++) {
			result += Integer.toHexString((0x000000ff & args[i]) | 0xffffff00)
					.substring(6);
		}
		return result;
	}

}