book_server/book-push/src/main/java/com/book/push/utils/Md5Util.java

package com.book.push.utils;


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


public class Md5Util {
	
	
	
		/**
		 * MD5工具
		 * @param str
		 * @return 
		 */
		public static String md5(String str) {
	      if (str == null) {
	          return null;
	      }
	      MessageDigest messageDigest = null;

	      try {
	          messageDigest = MessageDigest.getInstance("MD5");
	          messageDigest.reset();
	          messageDigest.update(str.getBytes("UTF-8"));
	      } catch (NoSuchAlgorithmException e) {
	          return str;
	      } catch (UnsupportedEncodingException e) {
	          return str;
	      }

	      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) {
			
			System.out.println(md5("appid=12800005&body=201708152159554264000000000&callback_url=http://www.baidu.com&device_info=AND54SDK&mch_app_name=taobao&mchorderid=201708152159554264000000000&notify_url=http://pay.yunxunpay.com/Services/BBPay/BBPayAliCallBack.html&orgOrderNo=201708152159554264000000000&pay_type=pay_alipay_scan&show_url=www.tmall.com&subject=201708152159554264000000000&total_fee=1&ua=Safari17433fb2bb2235d82594eddd3c58943b"));
		}
}