package com.nooice.library.utils;

import java.security.MessageDigest;

/**

 * @describe <MD5加密>
 */
public class MD5Util {
 private static final String ENCODING = "UTF-8";// 编码格式

 // md5加密

 public static String md5(String string) {
  try {
   byte[] source = string.getBytes(ENCODING);//把要加密的字符串先拆分成byte[]数组
   MessageDigest md = MessageDigest.getInstance("MD5");//MessageDigest类通过getinstance传入算法名称“MD5”得到其对象
   byte[] md5Bytes = md.digest(source);//把准备好的byte数组通过digest方法获得新的散列码
   
   StringBuilder builder = new StringBuilder();//可以看成字符串容器
   for (byte b : md5Bytes) {//把加密后的散列码转换成字符串连接起来
    builder.append(Integer.toString((b & 0xff) + 0x100, 16).substring(1));//把byte转化成32位16进制的字符串

   }

   return builder.toString();
  } catch (Exception e) {
   e.printStackTrace();
   return "";
  }
 }
}