1 原生的

package com.pibigstar.common.utils;

import java.security.MessageDigest;

/**
 * MD5加密工具类
 * @author pibigstar
 *
 */
public class MyMD5Util {
  
	//盐，用于混交md5
	private static final String slat = "&%5123***&&%%$$#@";
	public static String encrypt(String dataStr) {
  
		try {
  
			dataStr = dataStr + slat;
			MessageDigest m = MessageDigest.getInstance("MD5");
			m.update(dataStr.getBytes("UTF8"));
			byte s[] = m.digest();
			String result = "";
			for (int i = 0; i < s.length; i++) {
  
				result += Integer.toHexString((0x000000FF & s[i]) | 0xFFFFFF00).substring(6);
			}
			return result;
		} catch (Exception e) {
  
			e.printStackTrace();
		}

		return "";
	}

}

2 使用Spring中的工具类

package com.pibigstar.common.utils;

import org.springframework.util.DigestUtils;

import com.pibigstar.common.Constant;

/**
 * MD5工具类
 * @author pibigstar
 *
 */
public class MD5Util {
  
	//盐，用于混交md5
	private static final String slat = "&%5123***&&%%$$#@";
	/**
	 * 生成md5
	 * @param seckillId
	 * @return
	 */
	public static String getMD5(String str) {
  
		String base = str +"/"+slat;
		String md5 = DigestUtils.md5DigestAsHex(base.getBytes());
		return md5;
	}

}