简单的md5加密

import java.security.MessageDigest;

import org.apache.commons.codec.binary.Hex;


public class PasswdUtil {

	// 简单加密
	public static String encodeByHex(String passwd) throws Exception {
		if(passwd==null||passwd.trim().equals("")){
			throw new RuntimeException("密码为空！");
		}
		return new String(Hex.encodeHex(MessageDigest.getInstance("MD5")
				.digest(passwd.getBytes())));
	}
}