MD5加密算法

package com.chinasofti.util;

import java.security.MessageDigest;

/**
 * 16进制 MD5加密
 */
public class Md5Util {
    public static String encode(String str) {
        String md5str = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] input = str.getBytes();
            byte[] buff = md.digest(input);
            md5str = bytesToHex(buff);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return md5str;
    }

    public static String bytesToHex(byte[] bytes) {
        StringBuffer md5str = new StringBuffer();
        int digital;
        for (int i = 0; i < bytes.length; i++) {
            digital = bytes[i];
            if (digital < 0) {
                digital += 256;
            }
            if (digital < 16) {
                md5str.append("0");
            }
            md5str.append(Integer.toHexString(digital));
        }
        return md5str.toString().toUpperCase();
    }
}