MD5加密算法样例以及解析(非原创，收集整理)

public class Md5Util {
    /**
     * @author lwl
     * @param message 需要加密的字符串
     * @return md5加密后的字符串
     */
    public static String getMd5(String message){
        String md5str = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] input  = message.getBytes();
            byte[] buff = md.digest(input);
            md5str = bytesToHex(buff);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return md5str.toLowerCase(); //将返回的加密字符串转换成小写
    }
    public static String bytesToHex(byte[] bytes){

        StringBuffer md5str = new StringBuffer();
        //把数组每一字节换成16进制连成md5字符串
        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();
    }
}