package com.gyee.frame.util;

import java.security.MessageDigest;

/**
* MD5 工具类-建议添油加醋的对入参 str 改造一下
* @author Administrator
*
*/
public class MD5Util {

	 
	//工具类不允许被实例化
	private MD5Util() throws Exception {
		throw new Exception("异常");
	}
	public static String encode(String str) {
		MessageDigest md5 = null;
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		char[] charArray = str.toCharArray();
		byte[] byteArray = new byte[charArray.length];
 
		for (int i = 0; i < charArray.length; i++){
			byteArray[i] = (byte) charArray[i];
		}
			
		byte[] md5Bytes = md5.digest(byteArray);
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16) {
				hexValue.append("0");
			}
 
			hexValue.append(Integer.toHexString(val));
		}
		return hexValue.toString();
	}
 

}
